ZEBRA ZT420 - Label printer

ZT420 - Label printer ZEBRA - Free user manual and instructions

Find the device manual for free ZT420 ZEBRA in PDF.

📄 192 pages English EN Download 💬 AI Question 10 questions ⚙️ Specs
Notice ZEBRA ZT420 - page 2
Pick your language and provide your email: we'll send you a specifically translated version.
Product TypeIndustrial Direct Thermal / Thermal Transfer Label Printer
BrandZebra
ModelZT420
Dimensions (W x D x H)12.6 x 22.7 x 12.9 in (320 x 576 x 328 mm)
Weight55.1 lb (25 kg)
Power Supply100-240 VAC, 50/60 Hz
Print MethodDirect Thermal or Thermal Transfer
Resolution203 dpi (8 dots/mm) standard; optional 300 dpi (12 dots/mm) or 600 dpi (24 dots/mm)
Maximum Print SpeedUp to 10 ips (254 mm/s)
Maximum Print Width4.09 in (104 mm)
Maximum Label Roll Diameter8 in (203 mm) outer diameter
Media Core Diameter3 in (76 mm)
Ribbon Capacity984 ft (300 m) length
ConnectivityUSB, Serial, Ethernet; optional Wi-Fi, Bluetooth, Parallel
Display3.5 in (89 mm) color touchscreen
Memory256 MB Flash, 512 MB SDRAM
Operating Temperature40°F to 104°F (5°C to 40°C)
Warranty1 year standard; extended options available
MaintenanceClean printhead and platen roller regularly; use approved cleaning supplies
SafetyComplies with FCC, CE, UL, RoHS
Repairability & Spare PartsReplacement printheads, platen rollers, motors, and logic boards available
Included AccessoriesPower cord, setup CD, quick start guide

Frequently Asked Questions - ZT420 ZEBRA

How do I load labels and ribbon into the Zebra ZT420?
Open the top cover, release the printhead assembly. Place the label roll on the media hub and route the media according to the diagram inside the printer. For thermal transfer, load the ribbon with the coating side facing the media. Close the printhead and top cover. Use the touchscreen to calibrate media.
How do I connect the ZT420 to my computer via USB?
Connect a standard USB 2.0 cable from the printer to your computer. Install the latest Zebra driver from the official website or the included CD. The printer will appear as a USB printer in your system. Configure settings using Zebra Setup Utilities.
What types of labels can I print with the ZT420?
The ZT420 supports both direct thermal and thermal transfer labels. It can print on continuous or die-cut labels, tags, and receipt paper up to 4.1 inches wide. Use compatible media with proper core size (3 inch).
How do I change the print resolution on my ZT420?
The print resolution is hardware-specific; you cannot change it in software. The standard is 203 dpi. If you need higher resolution, you must order the optional 300 dpi or 600 dpi printhead version. Use the proper driver and settings when printing.
Why is my ZT420 printer showing a 'Media Out' error?
This error indicates the printer cannot detect media. Ensure labels are loaded correctly and the media sensor (gap/notch or reflective) is aligned. Perform a media calibration via the touchscreen menu: Settings > Calibration > Media Calibration.
How do I clean the printhead and platen roller?
Turn off the printer and open the top cover. Remove the ribbon and media. Use a 99% isopropyl alcohol swab or Zebra-approved cleaning pen to gently wipe the printhead in one direction. Use a lint-free cloth dampened with alcohol to clean the platen roller. Let dry before closing.
Can I use the ZT420 with a wireless network?
Yes, the ZT420 supports optional internal Wi-Fi via the Zebra Wireless Adapter. Alternatively, you can use an external Wi-Fi bridge. Configure wireless settings through the touchscreen under Network > Wi-Fi.
What is the maximum print speed for the ZT420?
The maximum print speed is 10 inches per second (ips) or 254 mm/s. Actual speed depends on resolution, complexity of the label, and media type. For best quality at higher resolutions, lower speeds may be recommended.
How do I replace the printhead on my ZT420?
Turn off the printer. Open the top cover and release the printhead assembly. Disconnect the ribbon cable. Remove the screws securing the printhead. Install the new printhead, reconnect the cable, and recalibrate the printer. Follow the instructions in the service manual.
Where can I download the user manual and software for the ZT420?
Visit Zebra's official support page (zebra.com/support). Search for ZT420. You can download the User Guide, Driver Installer, Zebra Setup Utilities, and Communications Manual in PDF format.

User questions about ZT420 ZEBRA

0 question about this device. Answer the ones you know or ask your own.

Ask a new question about this device

The email remains private: it is only used to notify you if someone responds to your question.

No questions yet. Be the first to ask one.

Download the instructions for your Label printer in PDF format for free! Find your manual ZT420 - ZEBRA and take your electronic device back in hand. On this page are published all the documents necessary for the use of your device. ZT420 by ZEBRA.

USER MANUAL ZT420 ZEBRA

Zebra® ZT400 Series™

User Guide

© 2014 ZIH Corp. The copyrights in this manual and the software and/or firmware in the printer described therein are owned by ZIH Corp. and Zebra's licensors. Unauthorized reproduction of this manual or the software and/or firmware in the printer may result in imprisonment of up to one year and fines of up to \$10,000 (17 U.S.C.506). Copyright violators may be subject to civil liability.

This product may contain ZPL ^® , ZPL II ^® , and ZebraLink ^™ programs; Element Energy Equalizer ^® Circuit; E ^3® ; and Monotype Imaging fonts. Software © ZIH Corp. All rights reserved worldwide.

Zebra, the Zebra head graphic, Link-OS, ZPL, and ZPL II are trademarks of ZIH Corp., registered in many jurisdictions worldwide. All rights reserved.

Bluetooth ^® is a registered trademark of the Bluetooth SIG.

All other brand names, product names, or trademarks belong to their respective holders. For additional trademark information, please see “Trademarks” on the product CD.

Proprietary Statement This manual contains proprietary information of Zebra Technologies Corporation and its subsidiaries (“Zebra Technologies”). It is intended solely for the information and use of parties operating and maintaining the equipment described herein. Such proprietary information may not be used, reproduced, or disclosed to any other parties for any other purpose without the express, written permission of Zebra Technologies.

Product Improvements Continuous improvement of products is a policy of Zebra Technologies. All specifications and designs are subject to change without notice.

Liability Disclaimer Zebra Technologies takes steps to ensure that its published Engineering specifications and manuals are correct; however, errors do occur. Zebra Technologies reserves the right to correct any such errors and disclaims liability resulting therefrom.

Limitation of Liability In no event shall Zebra Technologies or anyone else involved in the creation, production, or delivery of the accompanying product (including hardware and software) be liable for any damages whatsoever (including, without limitation, consequential damages including loss of business profits, business interruption, or loss of business information) arising out of the use of, the results of use of, or inability to use such product, even if Zebra Technologies has been advised of the possibility of such damages. Some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

ZEBRA ZT420 - User Guide - 1

Declaration of Conformity

We have determined that the Zebra printers identified as the

ZT410 ^TM and ZT420 ^TM

manufactured by:

Zebra Technologies Corporation

475 Half Day Road, Suite 500

Lincolnshire, Illinois 60069 U.S.A.

Have been shown to comply with the applicable technical standards of the FCC

For Home, Office, Commercial, and Industrial use

If no unauthorized change is made in the equipment, and if the equipment is properly maintained and operated.

Compliance Information

FCC Compliance Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

  1. This device may not cause harmful interference, and
  2. This device must accept any interference received, including interference that may cause undesired operation.

ZEBRA ZT420 - FCC Compliance Statement - 1

Note • This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

FCC Radiation Exposure Statement (for printers with RFID encoders)

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body.

This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

Canadian DOC Compliance Statement

This Class B digital apparatus complies with Canadian ICES-003.

Declaration of Conformity 3

Compliance Information 4

About This Document 9

Who Should Use This Document 10

How This Document Is Organized 10

1 • Introduction ...... 11

Printer Options 12

Printer Components 13

Control Panel 14

Near Field Communication (NFC) 15

Types of Media 16

Ribbon Overview 18

When to Use Ribbon 18

Coated Side of Ribbon 18

2 • Printer Setup and Operation 21

Handling the Printer 22

Unpack and Inspect the Printer 22

Store the Printer 22

Ship the Printer 22

Select a Location for the Printer 23

Select a Communication Interface 24

Data Cables 26

Connect the Printer to a Power Source 27

Power Cord Specifications 28

Select a Print Mode 30

Load the Media 34

Final Steps for Tear-Off Mode 40

Final Steps for Peel-Off Mode

(with or without Liner Take-Up) 42

Final Steps for Rewind Mode 51

Final Steps for Cutter Mode 57

Load the Ribbon 60

3 • Printer Configuration and Adjustment 65

Adjust Printer Settings 66

Print Settings 67

Calibration and Diagnostic Tools 71

Network Settings 77

RFID Settings 80

Language Settings 83

Sensor Settings 86

Port Settings 87

BlueTooth Settings 89

User Menus 90

Navigating through Screens in the Display 90

SETTINGS Menu 94

TOOLS Menu 97

NETWORK Menu 102

RFID Menu 108

LANGUAGE Menu 111

SENSORS Menu 113

PORTS Menu 115

BLUETOOTH Menu....117

Calibrate the Ribbon and Media Sensors 119

Adjust the Printhead Pressure 124

Remove Used Ribbon 128

4 • Routine Maintenance .... 129

Cleaning Schedule and Procedures 130

Clean the Exterior, the Media Compartment, and the Sensors 131

Clean the Printhead and Platen Roller 132

Clean the Peel Assembly 136

Clean the Cutter Module 140

Replacing Printer Components 144

Ordering Replacement Parts 144

Recycling Printer Components 144

Lubrication 144

5 • Troubleshooting 145

Meaning of Indicator Lights 146

Printing Issues 148

Ribbon Problems 151

RFID Problems 152

Error Messages 155

Communications Problems 159

Miscellaneous Issues 160

Printer Diagnostics 162

Power-On Self Test 162

CANCEL Self Test 163

PAUSE Self Test 164

FEED Self Test 165

FEED + PAUSE Self Test 168

CANCEL + PAUSE Self Test 168

Communication Diagnostics Test 169

Sensor Profile 170

6 • Specifications 173

General Specifications 174

Printing Specifications 175

Media Specifications 176

Ribbon Specifications 177

Glossary 179

Index 183

ZEBRA ZT420 - Index 183 - 1

Notes •

About This Document

This section provides you with contact information, document structure and organization, and additional reference documents.

Contents

Who Should Use This Document.... 10

How This Document Is Organized 10

Who Should Use This Document

This User Guide is intended for use by any person who needs to perform routine maintenance, upgrade, or troubleshoot problems with the printer.

How This Document Is Organized

The User Guide is set up as follows:

Section Description
Introduction on page 11This section provides a high-level overview of the printer and its components.
Printer Setup and Operation on page 21This section assists the technician with initial setup and operation of the printer.
Printer Configuration and Adjustment on page 65This section assists you with configuration of and adjustments to the printer.
Routine Maintenance on page 129This section provides routine cleaning and maintenance procedures.
Troubleshooting on page 145This section provides information about errors that you might need to troubleshoot. Assorted diagnostic tests are included.
Specifications on page 173This section lists general printer specifications, printing specifications, ribbon specifications, and media specifications.
Glossary on page 179The glossary provides a list of common terms.

1

Introduction

This section provides a high-level overview of the printer and its components.

Contents

Printer Components.... 13

Control Panel 14

Types of Media.... 16

Ribbon Overview 18

When to Use Ribbon 18

Coated Side of Ribbon.... 18

Printer Options

The available printer options are shown in Figure 1. For information about the print modes that can be used with the printer options, see Select a Print Mode on page 30.

Figure 1 • Printer Options
ZEBRA ZT420 - Printer Options - 1

natural_image Technical line drawing of a mechanical device with no visible text or symbols

ZEBRA ZT420 - Printer Options - 2

natural_image Technical line drawing of a mechanical device with internal components and no visible text or symbols

ZEBRA ZT420 - Printer Options - 3

natural_image Technical line drawing of a mechanical machine with no visible text or symbols

ZEBRA ZT420 - Printer Options - 4

natural_image Technical line drawing of a mechanical machine with no visible text or symbols
1Tcar-Off (standard)
2Peel with Liner Take-Up option
3Rewind option
4Cutter option

Printer Components

ZEBRA ZT420 - Printer Components - 1

Note • The components inside your printer are color-coded.

  • The touch points that you will need to handle are colored gold inside the printers and are highlighted in gold in the illustrations in this manual.
  • The components associated with the ribbon system are made of black plastic, while the components associated with media are made of gray plastic. Those components and others are highlighted in light blue in the illustrations in this manual as needed.

Figure 2 shows the components inside the media compartment of a standard printer. Depending on the printer model and the installed options, your printer may look slightly different. The components that are labeled are mentioned in procedures throughout this manual.
Figure 2 • Printer Components 1 2 3 4 5 6 7 8 9 10

1Media door
2Printhead pressure adjustment toggles
3Control panel
4USB host port
5Printhead assembly
6Printhead-open lever
7Ribbon take-up spindle*
8Ribbon supply spindle*
9Media supply hanger
10Media supply guide

* This component appears only in printers that have the Thermal Transfer option installed.

Control Panel

The control panel indicates the printer's current status and allows the user to control basic printer operation.

Figure 3 • Control Panel
ZEBRA ZT420 - Control Panel - 1

flowchart
graph TD
    A["STATUS"] --> B["6"]
    C["PAUSE"] --> D["7"]
    E["DATA"] --> F["8"]
    G["SUPPLIES"] --> H["9"]
    I["NETWORK"] --> J["10"]
    K["OK"] --> L["11"]
    M["PULSE"] --> N["12"]
    O["FEED"] --> P["13"]
    Q["CANCEL"] --> R["14"]
    S["15"] --> T["16"]
1STATUS lightThese indicator lights show the current status of the printer. For more information, see Table 1 on page 146.
2PAUSE light
3DATA light
4SUPPLIES light
5NETWORK light
6The display shows the printer's current status and allows the user to navigate the menu system.
7RIGHT SELECT buttonThese buttons execute the commands shown directly above them in the display.
8LEFT SELECT button
9The UP ARROW button changes the parameter values. Common uses are to increase a value or to scroll through choices.
10The OK button selects or confirms what is shown on the display.
11The LEFT ARROW button, which is active only in the menu system, navigates to the left.
12The RIGHT ARROW button, which is active only in the menu system, navigates to the right.
13The DOWN ARROW button changes the parameter values. Common uses are to decrease a value or to scroll through choices.
14The PAUSE button starts or stops printer operation when pressed.
15The FEED button forces the printer to feed one blank label each time the button is pressed.
16The CANCEL button cancels label formats when the printer is paused.Press once to cancel the next label format.Press and hold for 2 seconds to cancel all label formats.

Near Field Communication (NFC)

The Zebra Print Touch™ feature allows you to touch an Android™-based, NFC-enabled smartphone or tablet to the Zebra Print Touch logo (Figure 4) to pair the device to the printer. Your device then launches an app that displays a menu of choices that are specific to your Zebra printer.

Figure 4 • Print Touch Logo Location
ZEBRA ZT420 - Near Field Communication (NFC) - 1

natural_image Line drawing of a mechanical device with a circular annotation highlighting a component (no text or symbols present)

Types of Media

ZEBRA ZT420 - Types of Media - 1

Important • Zebra strongly recommends the use of Zebra-brand supplies for continuous high-quality printing. A wide range of paper, polypropylene, polyester, and vinyl stock has been specifically engineered to enhance the printing capabilities of the printer and to prevent premature printhead wear. To purchase supplies, go to http://www.zebra.com/howtobuy.

Your printer can use various types of media:

- Standard media—Most standard media uses an adhesive backing that sticks individual labels or a continuous length of labels to a liner. Standard media can come on rolls or in a fanfold stack (Table 1).

- Tag stock—Tags are usually made from a heavy paper. Tag stock does not have adhesive or a liner, and it is typically perforated between tags. Tag stock can come on rolls or in a fanfold stack (Table 1).

- Radio frequency identification (RFID) “smart” media—RFID media can be used in a printer that is equipped with an RFID reader/encoder. RFID labels are made from the same materials and adhesives as non-RFID labels. Each label has an RFID transponder (sometimes called an “inlay”), made of a chip and an antenna,

ZEBRA ZT420 - Types of Media - 2

embedded between the label and the liner. The shape of the transponder varies by manufacturer and is visible through the label. All “smart” labels have memory that can be read, and many have memory that can be encoded.

ZEBRA ZT420 - Types of Media - 3

Important • Transponder placement within a label depends on the transponder type and the printer model. Make sure that you are using the correct “smart” media for your printer. For more information, refer to the RFID Programming Guide 3. A copy of the manual is available at http://www.zebra.com/manuals or on the user CD that came with your printer. For transponder placement details, go to http://www.zebra.com/transponders.

Table 1 • Roll and Fanfold Media

Media Type How It Looks Description
Non-Continuous Roll MediaZEBRA ZT420 - Types of Media - 4Roll media is wound on a core that can be 1 in. to 3 in. (25 to 76 mm) in diameter. Individual labels or tags are separated by one or more of the following methods:Web media separates labels by gaps, holes, or notches.ZEBRA ZT420 - Types of Media - 5Black mark media uses pre-printed black marks on the back side of the media to indicate label separations.Z7KG]Perforated media has perforations that allow the labels or tags to be separated from each other easily. The media may also have black marks or other separations between labels or tags.ZEBRA ZT420 - Types of Media - 6
Non-Continuous Fanfold MediaZEBRA ZT420 - Types of Media - 7Fanfold media is folded in a zigzag pattern. Fanfold media can have the same label separations as non-continuous roll media. The separations would fall on or near the folds.
Continuous Roll MediaZEBRA ZT420 - Types of Media - 8Roll media is wound on a core that can be 1 in. to 3 in. (25 to 76 mm) in diameter.Continuous roll media does not have gaps, holes, notches, or black marks to indicate label separations. This allows the image to be printed anywhere on the label. Sometimes a cutter is used to cut apart individual labels.

Ribbon Overview

Ribbon is a thin film that is coated on one side with wax, resin, or wax resin, which is transferred to the media during the thermal transfer process. The media determines whether you need to use ribbon and how wide the ribbon must be.

When ribbon is used, it must be as wide as or wider than the media being used. If the ribbon is narrower than the media, areas of the printhead are unprotected and subject to premature wear.

When to Use Ribbon

Thermal transfer media requires ribbon for printing while direct thermal media does not. To determine if ribbon must be used with a particular media, perform a media scratch test.

To perform a media scratch test, complete these steps:

  1. Scratch the print surface of the media rapidly with your fingernail.

  2. Did a black mark appear on the media?

If a black mark... Then the media is...
Does not appear on the mediaThermal transfer. A ribbon is required.
Appears on the mediaDirect thermal. No ribbon is required.

Coated Side of Ribbon

Ribbon can be wound with the coated side on the inside or outside (Figure 5). This printer can only use ribbon that is coated on the outside. If you are unsure which side of a particular roll of ribbon is coated, perform an adhesive test or a ribbon scratch test to determine which side is coated.

Figure 5 • Ribbon Coated on Outside or Inside
Outside Inside
ZEBRA ZT420 - Coated Side of Ribbon - 1

natural_image Two grayscale illustrations of pen writing on paper, one showing a brush and the other a rolled document (no text or symbols)

Adhesive Test

If you have labels available, perform the adhesive test to determine which side of a ribbon is coated. This method works well for ribbon that is already installed.

To perform an adhesive test, complete these steps:

  1. Peel a label from its liner.

  2. Press a corner of the sticky side of the label to the outer surface of the roll of ribbon.

  3. Peel the label off of the ribbon.

  4. Observe the results. Did flakes or particles of ink from the ribbon adhere to the label?

If ink from the ribbon... Then...
Adhered to the labelThe ribbon is coated on the outside and can be used in this printer.ZEBRA ZT420 - To perform an adhesive test, complete these steps: - 1
Did not adhere to the labelThe ribbon is coated on the inside and cannot be used in this printer.To verify this, repeat the test on the other surface of the roll of ribbon.ZEBRA ZT420 - To perform an adhesive test, complete these steps: - 2

Ribbon Scratch Test

Perform the ribbon scratch test when labels are unavailable.

To perform a ribbon scratch test, complete these steps:

  1. Unroll a short length of ribbon.

  2. Place the unrolled section of ribbon on a piece of paper with the outer surface of the ribbon in contact with the paper.

  3. Scratch the inner surface of the unrolled ribbon with your fingernail.

  4. Lift the ribbon from the paper.

  5. Observe the results. Did the ribbon leave a mark on the paper?

If the ribbon... Then...
Left a mark on the paperThe ribbon is coated on the outside and can be used in this printer.ZEBRA ZT420 - To perform a ribbon scratch test, complete these steps: - 1
Did not leave a mark on the paperThe ribbon is coated on the inside and cannot be used in this printer.To verify this, repeat the test on the other surface of the roll of ribbon.ZEBRA ZT420 - To perform a ribbon scratch test, complete these steps: - 2

ZEBRA ZT420 - To perform a ribbon scratch test, complete these steps: - 3

Notes •

2

Printer Setup and Operation

This section assists the technician with initial setup and operation of the printer.

Contents

Handling the Printer 22

Unpack and Inspect the Printer 22

Store the Printer....22

Ship the Printer 22

Select a Location for the Printer.... 23

Select a Communication Interface 24

Data Cables 26

Connect the Printer to a Power Source 27

Power Cord Specifications 28

Select a Print Mode 30

Load the Ribbon....60

Load the Media 34

Handling the Printer

This section describes how to handle your printer.

Unpack and Inspect the Printer

When you receive the printer, immediately unpack it and inspect for shipping damage.

  • Save all packing materials.
  • Check all exterior surfaces for damage.
  • Raise the media door, and inspect the media compartment for damage to components.

If you discover shipping damage upon inspection:

  • Immediately notify the shipping company and file a damage report.
  • Keep all packaging material for shipping company inspection.
  • Notify your authorized Zebra reseller

ZEBRA ZT420 - Unpack and Inspect the Printer - 1

Important • Zebra Technologies is not responsible for any damage incurred during the shipment of the equipment and will not repair this damage under warranty.

Store the Printer

If you are not placing the printer into immediate operation, repackage it using the original packing materials. You may store the printer under the following conditions:

• Temperature: -40^ F to 140^ F ( -40^ to 60^ C)
• Relative humidity: 5% to 85% non-condensing

Ship the Printer

If you must ship the printer:

  • Turn off (O) the printer, and disconnect all cables.
  • Remove any media, ribbon, or loose objects from the printer interior.
  • Close the printhead.
  • Carefully pack the printer into the original container or a suitable alternate container to avoid damage during transit. A shipping container can be purchased from Zebra if the original packaging has been lost or destroyed.

Select a Location for the Printer

Select a location for the printer that meets these conditions:

  • Surface: The surface where the printer will be located must be solid, level, and of sufficient size and strength to hold the printer.
  • Space: The area where the printer will be located must include enough space for ventilation and for accessing the printer components and connectors. To allow for proper ventilation and cooling, leave open space on all sides of the printer.

ZEBRA ZT420 - Select a Location for the Printer - 1

Caution • Do not place any padding or cushioning material behind or under the printer because this restricts air flow and could cause the printer to overheat.

  • Power: The printer should be within a short distance of an appropriate power outlet that is easily accessible.
  • Data communication interfaces: The printer must be within range of your WLAN radio (if applicable) or within an acceptable range for other connectors to reach your data source (usually a computer). For more information on maximum cable lengths and configuration, see Table 2 on page 25.
  • Operating conditions: Your printer is designed to function in a wide range of environmental and electrical conditions, including a warehouse or factory floor. Table 1 shows the temperature and relative humidity requirements for the printer when it is operating.

Table 1 • Operating Temperature and Humidity

Mode Temperature Relative Humidity
Thermal Transfer 40° to 104°F (5° to 40°C) 20 to 85% non-condensing
Direct Thermal 32° to 104°F (0° to 40°C)

Select a Communication Interface

You may connect your printer to a computer using one or more of the available connections. The standard connections are shown in Figure 1. A ZebraNet wired or wireless print server option or a parallel port may also be present on your printer.

Figure 1 • Communication Interfaces
10101

Internal wired Ethernet print server
Serial port
USB port

Table 2 on page 25 provides basic information about communication interfaces that you can use to connect your printer to a computer. You may send label formats to the printer through any communication interface that is available. Select an interface that is supported by both your printer and your computer or your Local Area Network (LAN).

Caution • Ensure that the printer power is off (O) before connecting data communications cables. Connecting a data communications cable while the power is on (I) may damage the printer.

Table 2 • Communication Interfaces

InterfaceStandard or OptionDescription
Bluetooth®StandardLimitations and Requirements Many mobile devices can communicate with the printer within a 10-foot radius of the printer.
Connections and Configuration Refer to the Zebra Bluetooth User Guide for specific instructions for configuring your printer to use a Bluetooth interface. A copy of this manual is available at http://www.zebra.com/manuals.
RS-232 Serial StandardLimitations and Requirements• Maximum cable length of 50 ft (15.24 m).• You may need to change printer parameters to match the host computer.• You need to use a null-modem adaptor to connect to the printer if using a standard modem cable.
Connections and Configuration The baud rate, number of data and stop bits, the parity, and the XON/XOFF or DTR control must match those of the host computer.
USB Standard Limitations and Requirements• Maximum cable length of 16.4 ft (5 m).• No printer parameter changes required to match the host computer.
Connections and Configuration No additional configuration is necessary.
Wired Ethernet print serverStandard Limitations and Requirements• Can print to the printer from any computer on your LAN.• Can communicate with the printer through the printer's web pages.• The printer must be configured to use your LAN.• A parallel connection or a wireless print server (if installed) takes up this port on the printer.Caution • Be careful not to plug a USB cable into a wired Ethernet print server connector on the printer because doing so will damage the Ethernet connector.
Connections and Configuration Refer to the ZebraNet Wired and Wireless Print Servers User Guide for configuration instructions. A copy of this manual is available at http://www.zebra.com/manuals.ZEBRA ZT420 - Select a Communication Interface - 2 Note • To use this connection, you may need to remove a factory-installed plug that is designed to keep someone from accidentally plugging a USB connector into this port.

Table 2 • Communication Interfaces (Continued)

InterfaceStandard or OptionDescription
8-bit Parallel data interfaceOption Limitations and Requirements• Maximum cable length of 10 ft (3 m).• Recommended cable length of 6 ft (1.83 m).• No printer parameter changes required to match the host computer.• A wired or wireless print server (if installed) takes up this port on the printer.
Wireless print server Option Limitations and Requirements• Can print to the printer from any computer on your Wireless Local Area Network (WLAN).• Can communicate with the printer through the printer's web pages.• The printer must be configured to use your WLAN.• A parallel connection or a wired print server (if installed) takes up this port on the printer.

Data Cables

You must supply all data cables for your application.

Ethernet cables do not require shielding, but all other data cables must be fully shielded and fitted with metal or metallized connector shells. Unshielded data cables may increase radiated emissions above the regulated limits.

To minimize electrical noise pickup in the cable:

  • Keep data cables as short as possible.
  • Do not bundle the data cables tightly with the power cords.
  • Do not tie the data cables to power wire conduits.

Connect the Printer to a Power Source

The AC power cord must have a three-prong female connector on one end that plugs into the mating AC power connector at the rear of the printer. If a power cable was not included with your printer, refer to Power Cord Specifications on page 28.

ZEBRA ZT420 - Connect the Printer to a Power Source - 1

Caution • For personnel and equipment safety, always use an approved three-conductor power cord specific to the region or country intended for installation. This cord must use an IEC 320 female connector and the appropriate region-specific three-conductor grounded plug configuration.

To connect the printer to a power source, complete these steps:

  1. Plug the female end of the A/C power cord into the A/C power connector on the back of the printer.

ZEBRA ZT420 - To connect the printer to a power source, complete these steps: - 1

natural_image Line drawing of a computer tower with an attached USB cable (no text or symbols)
  1. Plug the male end of the A/C power cord into an appropriate power outlet.

115 V AC 230 V AC

  1. Turn on (I) the printer.

ZEBRA ZT420 - To connect the printer to a power source, complete these steps: - 3

natural_image Line drawing of a computer tower with a hand pointing to the right panel (no text or symbols present)

The printer boots up and performs a self-test. The printer reports its status through the indicator lights on the control panel (see Table 1 on page 146 for the meaning of the light colors and combinations).

Power Cord Specifications

ZEBRA ZT420 - Power Cord Specifications - 1

Caution • For personnel and equipment safety, always use an approved three-conductor power cord specific to the region or country intended for installation. This cord must use an IEC 320 female connector and the appropriate region-specific, three-conductor grounded plug configuration.

Depending on how your printer was ordered, a power cord may or may not be included. If one is not included or if the one included is not suitable for your requirements, see Figure 2 and refer to the following guidelines:

• The overall cord length must be less than 9.8 ft. (3 m).

• The cord must be rated for at least 10 A, 250 V.

- The chassis ground (earth) must be connected to ensure safety and reduce electromagnetic interference.

Figure 2 • Power Cord Specifications
1 2 3 4

1AC power plug for your country—This should bear the certification mark of at least one of the known international safety organizations (Figure 3).
23-conductor HAR cable or other cable approved for your country.
3IEC 320 connector—This should bear the certification mark of at least one of the known international safety organizations (Figure 3).
4Length ≤ 9.8 ft. (3 m). Rating 10 Amp, 250 VAC.

Figure 3 • International Safety Organization Certification Symbols
Collection of corporate logos including PSE, SAB, SA, and others with standard alphanumeric codes and symbols.

Select a Print Mode

Use a print mode that matches the media being used and the printer options available (Table 3). The media path is the same for roll and fanfold media.

Table 3 • Print Modes and Printer Options

Print Mode When to Use/Printer Options Required Printer Actions
Tear-Off (default setting)Use for most applications. This mode can be used with any printer options and most media types.
Roll media in Tear-Off modeZEBRA ZT420 - Select a Print Mode - 1Fanfold media in Tear-Off mode (shown fed through the rear access slot)ZEBRA ZT420 - Select a Print Mode - 2

Red solid lines = media, Blue dotted lines = backing only

Table 3 • Print Modes and Printer Options

Print Mode When to Use/Printer Options Required Printer Actions
Cutter Use if the printer has a cutter option when you want the labels to be cut apart.The printer prints a label and then cuts it free.
Cutter modeZEBRA ZT420 - Select a Print Mode - 3
Peel-Off Use if the printer has the Peel-Off option, the Liner Take-Up option, or the Rewind option.The printer peels the label from the liner during printing and then pauses until the label is removed. The liner exits the front of the printer.
Peel-Off modeZEBRA ZT420 - Select a Print Mode - 4

Red solid lines = media, Blue dotted lines = backing only

Table 3 • Print Modes and Printer Options

Print Mode When to Use/Printer Options Required Printer Actions
Peel-Off (with Liner Take-Up)Use if the printer has the Liner Take-Up option or the Rewind option. The printer peels the label from the liner during printing and then pauses until the label is removed. The liner winds onto the liner take-up spindle or the rewind spindle.
Liner Take-Up OptionZEBRA ZT420 - Select a Print Mode - 5Rewind OptionZEBRA ZT420 - Select a Print Mode - 6

Red solid lines = media, Blue dotted lines = backing only

Table 3 • Print Modes and Printer Options

Print Mode When to Use/Printer Options Required Printer Actions
Rewind Use if the printer has the Rewind option. The printer winds the labels and liner onto the rewind spindle without peeling the labels from the liner.
Rewind modeZEBRA ZT420 - Select a Print Mode - 7

Red solid lines = media, Blue dotted lines = backing only

Load the Media

Use the instructions in this section for loading roll or fanfold media in any print mode.

Caution • While performing any tasks near an open printhead, remove all rings, watches, hanging necklaces, identification badges, or other metallic objects that could touch the printhead. You are not required to turn off the printer power when working near an open printhead, but Zebra recommends it as a precaution. If you turn off the power, you will lose all temporary settings, such as label formats, and you must reload them before you resume printing.

ZEBRA ZT420 - Load the Media - 1

Note • In some of the drawings that follow, the printer is shown without a ribbon system to give you a better view of the components involved in media loading.

To load media, complete these steps:

  1. Raise the media door.

ZEBRA ZT420 - To load media, complete these steps: - 1

natural_image Line drawing of a mechanical device with a curved arrow indicating rotation or motion (no text or symbols)

ZEBRA ZT420 - To load media, complete these steps: - 2

2.

Caution • The printhead may be hot and could cause severe burns. Allow the printhead to cool.

Open the printhead assembly by rotating the printhead-open lever.

ZEBRA ZT420 - To load media, complete these steps: - 3

natural_image Technical line drawing of a mechanical device with no visible text or symbols
  1. Insert media into the printer. Follow the instructions for roll or fanfold media, as appropriate.

ZEBRA ZT420 - To load media, complete these steps: - 4

Roll Media

3-a. Remove and discard any tags or labels that are dirty or that are held by adhesives or tape.

ZEBRA ZT420 - Roll Media - 1

natural_image Illustration of a hand holding a sheet of paper next to a rolled-up sheet of tape (no text or symbols)

ZEBRA ZT420 - Roll Media - 2

Fanfold Media

Pull out the media supply guide as far as it goes.

ZEBRA ZT420 - Fanfold Media - 1

natural_image Technical line drawing of a mechanical bracket with a cylindrical component and an arrow indicating direction (no text or symbols)

ZEBRA ZT420 - Fanfold Media - 2

Roll Media (Continued)

3-b. Pull out the media supply guide as far as it goes.

ZEBRA ZT420 - Roll Media (Continued) - 1

natural_image Technical line drawing of a mechanical bracket with a cylindrical component and an arrow indicating direction (no text or symbols)

ZEBRA ZT420 - Roll Media (Continued) - 2

Fanfold Media (Continued)

Feed the media through the rear or bottom access slot.

Rear Feed
ZEBRA ZT420 - Fanfold Media (Continued) - 1

natural_image Diagram of an electronic device interior with circuitry and wiring, no visible text or symbols

Bottom Feed
ZEBRA ZT420 - Fanfold Media (Continued) - 2

natural_image Diagram of an electronic device interior with visible circuitry and wiring (no text or labels)

3-c. Place the roll of media on the media supply hanger. Push the roll back as far as it will go.

Drape the media over the media supply hanger.

ZEBRA ZT420 - Fanfold Media (Continued) - 3

natural_image Technical line drawing of a mechanical assembly with a roller and bracket (no text or symbols)

ZEBRA ZT420 - Fanfold Media (Continued) - 4

natural_image Pure technical line drawing of a mechanical assembly with no text or symbols

ZEBRA ZT420 - Fanfold Media (Continued) - 5

Roll Media (Continued)

3-d. Slide in the media supply guide, until it touches the edge of the roll.

ZEBRA ZT420 - Roll Media (Continued) - 1

natural_image Technical line drawing of a cylindrical mechanical component with a central shaft and mounting holes (no text or symbols)

3-e. Continue with

step 4.

ZEBRA ZT420 - Roll Media (Continued) - 2

Fanfold Media (Continued)

Slide in the media supply guide, until it touches the edge of the media.

ZEBRA ZT420 - Fanfold Media (Continued) - 1

natural_image Pure technical line drawing of a mechanical assembly with no text or symbols

Continue with step 4 and the remaining steps as shown for roll media.

  1. Slide the media guide all the way out.

ZEBRA ZT420 - Fanfold Media (Continued) - 2

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. From the media hanger (1), feed the media under the dancer assembly (2), through the media sensor (3), and under the printhead assembly (4). Slide the media back until it touches the inside back wall of the media sensor.

Technical diagram of a mechanical assembly with numbered components and directional arrows indicating motion or flow.

  1. In which print mode will your printer be operating? (For more information on print modes, see Select a Print Mode on page 30.)
If using... Then...
Tear-Off mode Continue withFinal Steps forZEBRA ZT420 - Fanfold Media (Continued) - 4Tear-Off Mode on page 40.
Peel-Off mode (with or without Liner Take-Up) Continue withFinal Steps for Peel-Off Mode (with or without Liner Take-Up) on page 42.ZEBRA ZT420 - Fanfold Media (Continued) - 5
Rewind mode Continue withFinal Steps for Rewind Mode on page 51.ZEBRA ZT420 - Fanfold Media (Continued) - 6
Cutter mode Continue withFinal Steps for CutterZEBRA ZT420 - Fanfold Media (Continued) - 7Mode on page 57.

Final Steps for Tear-Off Mode

ZEBRA ZT420 - Final Steps for Tear-Off Mode - 1

natural_image Technical diagram of a mechanical component with a highlighted circular feature (no text or symbols)
  1. Slide in the media guide until it just touches the edge of the media.

ZEBRA ZT420 - Final Steps for Tear-Off Mode - 2

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Rotate the printhead-open lever (1) downward until it locks the printhead in place.

Technical diagram showing a mechanical assembly with labeled components and directional arrows indicating motion or assembly.

  1. Does the media that you are using require ribbon for printing? If you are not sure, see When to Use Ribbon on page 18.
If using... Then...
Direct Thermal media (no ribbon needed)Continue with step 4.
Thermal Transfer media (ribbon needed)a. If you have not already done so, load ribbon in the printer. SeeLoad the Ribbon on page 60.b. Continue with step 4.
  1. Close the media door.

ZEBRA ZT420 - Final Steps for Tear-Off Mode - 4

natural_image Line drawing of a device with a curved arrow indicating rotation or movement (no text or symbols present)
  1. Set the printer to Tear-Off mode (for more information, see Print Mode on page 69).

  2. Press PAUSE to exit pause mode and enable printing.

The printer may perform a label calibration or feed a label, depending on your settings.

  1. If desired, perform the CANCEL Self Test on page 163 to verify that your printer is able to print.

Media loading in Tear-Off mode is complete.

Final Steps for Peel-Off Mode (with or without Liner Take-Up)

ZEBRA ZT420 - Final Steps for Peel-Off Mode (with or without Liner Take-Up) - 1

natural_image Diagram of a device casing with internal components and a highlighted circular component (no text or symbols)
  1. Push down the peel-off mechanism release lever to open the peel assembly.

ZEBRA ZT420 - Final Steps for Peel-Off Mode (with or without Liner Take-Up) - 2

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Extend the media approximately 18 in. (500 mm) out of the printer.

ZEBRA ZT420 - Final Steps for Peel-Off Mode (with or without Liner Take-Up) - 3

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Remove the exposed labels so that only the liner remains.

ZEBRA ZT420 - Final Steps for Peel-Off Mode (with or without Liner Take-Up) - 4

natural_image Technical line drawing of a mechanical assembly with directional arrows indicating motion (no text or symbols)
  1. Feed the liner behind the peel assembly. Make sure that the end of the liner falls outside of the printer.

ZEBRA ZT420 - Final Steps for Peel-Off Mode (with or without Liner Take-Up) - 5

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Complete this step only if you want to use Peel-Off mode with Liner Take-Up. Your printer must have the Liner Take-Up option or the Rewind option installed. Follow the instructions for your printer option. If you are not using Liner Take-Up, continue with step 6.

5-a. Thread the liner into the slot below the peel assembly.

ZEBRA ZT420 - Final Steps for Peel-Off Mode (with or without Liner Take-Up) - 6

natural_image Technical line drawing of a mechanical device with no visible text or symbols

Rewind Option Liner Take-Up Option

5-b. Feed the liner under the media alignment roller (1).

Slide the liner into the slot in the liner take-up spindle (1).

ZEBRA ZT420 - Rewind Option Liner Take-Up Option - 1

natural_image Technical diagram of a mechanical printing or printing machine with a blue component and directional arrow (no text or symbols)

ZEBRA ZT420 - Rewind Option Liner Take-Up Option - 2

natural_image Diagram of a mechanical component with directional arrows indicating movement or force (no text or symbols)

Rewind Option (Continued)

5-c. Loosen the thumbscrew on the rewind media guide.

ZEBRA ZT420 - Rewind Option (Continued) - 1

natural_image Technical line drawing of a mechanical device with rotating component (no text or symbols)

5-d. Slide the rewind media guide all the way out, and then fold it down.

ZEBRA ZT420 - Rewind Option (Continued) - 2

natural_image Technical diagram of a mechanical assembly with directional arrows indicating motion or force (no text or symbols present)

Liner Take-Up Option (Continued)

Push the liner back until it touches the back plate of the liner take-up spindle assembly.

ZEBRA ZT420 - Liner Take-Up Option (Continued) - 1

natural_image Diagram of a mechanical component with concentric rings and a triangular blade-like structure (no text or symbols)

Wrap the liner around the liner take-up spindle and turn the spindle counterclockwise to tighten the liner.

ZEBRA ZT420 - Liner Take-Up Option (Continued) - 2

natural_image Diagram of a missile or projectile with directional arrow indicating rotation (no text or symbols)

For the Liner Take-Up option, loading of the liner is complete. Continue with step 6.

Rewind Option

(Continued)

5-e. Slide an empty core onto the rewind spindle.

ZEBRA ZT420 - (Continued) - 1

natural_image Technical illustration of a mechanical assembly with a highlighted cylindrical component and directional arrow (no text or symbols)

5-f. Wrap the liner around the core as shown, and then turn the rewind spindle to tighten the media. Ensure that the edge of the media is flush against the backplate of the rewind spindle.

ZEBRA ZT420 - (Continued) - 2

natural_image Technical illustration of a mechanical assembly with a rotating component and fan mechanism (no text or symbols)

Rewind Option (Continued)

5-g. Fold up the rewind media guide, and then slide it in until it touches the liner.

ZEBRA ZT420 - Rewind Option (Continued) - 1

natural_image Technical diagram of a mechanical assembly with a highlighted component and directional arrow (no text or symbols)

5-h. Tighten the thumbscrew on the rewind media guide.

ZEBRA ZT420 - Rewind Option (Continued) - 2

natural_image Technical line drawing of a mechanical device with rotating component (no text or symbols)

5-i. Loading of the liner is complete. Continue with step 6.

ZEBRA ZT420 - Rewind Option (Continued) - 3

6.

Caution • Use the peel release lever and your right hand to close the peel assembly. Do not use your left hand to assist in closing. The top edge of the peel roller/assembly could pinch your fingers.

Close the peel assembly using the peel-off mechanism release lever.

ZEBRA ZT420 - Rewind Option (Continued) - 4

natural_image Technical line drawing of a mechanical assembly with a belt switch (no text or symbols)
  1. Slide in the media guide until it just touches the edge of the media.

ZEBRA ZT420 - Rewind Option (Continued) - 5

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Rotate the printhead-open lever (1) downward until it locks the printhead in place.

Technical diagram showing a mechanical assembly with labeled components and directional arrows indicating motion or movement.

  1. Does the media that you are using require ribbon for printing? If you are not sure, see When to Use Ribbon on page 18.
If using... Then...
Direct Thermal media (no ribbon needed)Continue with step 10.
Thermal Transfer media (ribbon needed)a. If you have not already done so, load ribbon in the printer. SeeLoad the Ribbon on page 60.b. Continue with step 10.
  1. Close the media door.

ZEBRA ZT420 - Rewind Option (Continued) - 7

natural_image Line drawing of a device casing with internal components and an arrow indicating rotation (no text or symbols)
  1. Set the printer to Peel-Off mode (for more information, see Print Mode on page 69).

  2. Press PAUSE to exit pause mode and enable printing.

The printer may perform a label calibration or feed a label, depending on your settings.

  1. If desired, perform the CANCEL Self Test on page 163 to verify that your printer is able to print.

Media loading in Peel-Off mode is complete.

Final Steps for Rewind Mode

ZEBRA ZT420 - Final Steps for Rewind Mode - 1

natural_image Technical diagram of a mechanical assembly with highlighted components (no text or labels)
  1. Extend the media approximately 18 in. (500 mm) out of the printer.

ZEBRA ZT420 - Final Steps for Rewind Mode - 2

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Feed the media over the peel assembly.

ZEBRA ZT420 - Final Steps for Rewind Mode - 3

natural_image Technical line drawing of a mechanical clamp or bracket assembly (no text or symbols)
  1. Thread the media into the slot below the peel assembly.

ZEBRA ZT420 - Final Steps for Rewind Mode - 4

natural_image Technical line drawing of a mechanical device interior showing internal components and a directional arrow (no text or symbols)
  1. Feed the media under the media alignment roller.

ZEBRA ZT420 - Final Steps for Rewind Mode - 5

natural_image Technical line drawing of a mechanical printing or paper cutting machine with a blue roller and arrow indicating compression (no text or symbols present)
  1. Loosen the thumbscrew on the rewind media guide.

ZEBRA ZT420 - Final Steps for Rewind Mode - 6

natural_image Technical line drawing of a mechanical device with rotating component (no text or symbols)
  1. Slide the rewind media guide all the way out, and then fold it down.

ZEBRA ZT420 - Final Steps for Rewind Mode - 7

natural_image Mechanical assembly diagram showing a motor with rotating components and directional arrows indicating motion (no text or labels)
  1. Slide an empty core onto the rewind spindle.

ZEBRA ZT420 - Final Steps for Rewind Mode - 8

natural_image Technical diagram of a mechanical assembly showing internal components and motion direction (no text or labels)
  1. Wrap the media around the core as shown and turn the rewind spindle to tighten the media. Ensure that the edge of the media is flush against the backplate of the rewind spindle.

ZEBRA ZT420 - Final Steps for Rewind Mode - 9

natural_image Technical diagram of a mechanical assembly showing internal components and motion arrows (no text or labels)
  1. Fold up the rewind media guide, and then slide it in until it touches the media.

ZEBRA ZT420 - Final Steps for Rewind Mode - 10

natural_image Technical diagram of a mechanical assembly with internal components and directional arrows (no text or labels)
  1. Tighten the thumbscrew on the rewind media guide.

ZEBRA ZT420 - Final Steps for Rewind Mode - 11

natural_image Technical line drawing of a mechanical device with rotating component (no text or symbols)
  1. Slide in the outer media guide until it just touches the edge of the media.

ZEBRA ZT420 - Final Steps for Rewind Mode - 12

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Rotate the printhead-open lever (1) downward until it locks the printhead in place.

Technical diagram showing a mechanical assembly with labeled components and directional arrows indicating motion or assembly.

  1. Does the media that you are using require ribbon for printing? If you are not sure, see When to Use Ribbon on page 18.
If using... Then...
Direct Thermal media (no ribbon needed)Continue with step 14.
Thermal Transfer media (ribbon needed)a. If you have not already done so, load ribbon in the printer. SeeLoad the Ribbon on page 60.b. Continue with step 14.
  1. Close the media door.

ZEBRA ZT420 - Final Steps for Rewind Mode - 14

natural_image Line drawing of a computer monitor with an open rear panel and a curved arrow indicating rotation (no text or symbols)
  1. Set the printer to Rewind mode (for more information, see Print Mode on page 69).

  2. Press PAUSE to exit pause mode and enable printing.
    The printer may perform a label calibration or feed a label, depending on your settings.

  3. If desired, perform the CANCEL Self Test on page 163 to verify that your printer is able to print.
    Media loading in Cutter mode is complete.

Final Steps for Cutter Mode

ZEBRA ZT420 - Final Steps for Cutter Mode - 1

natural_image Technical diagram of a device casing with internal components and a highlighted circular component (no text or symbols)

ZEBRA ZT420 - Final Steps for Cutter Mode - 2

  1. Caution • The cutter blade is sharp. Do not touch or rub the blade with your fingers.

Feed the media through the cutter.

ZEBRA ZT420 - Final Steps for Cutter Mode - 3

natural_image Technical line drawing of a mechanical device with a paper feed insert and internal components (no text or symbols)
  1. Slide in the outer media guide until it just touches the edge of the media.

ZEBRA ZT420 - Final Steps for Cutter Mode - 4

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Rotate the printhead-open lever (1) downward until it locks the printhead in place.

Technical diagram showing a mechanical assembly with labeled components and directional arrows indicating motion or movement.

  1. Does the media that you are using require ribbon for printing? If you are not sure, see When to Use Ribbon on page 18.
If using... Then...
Direct Thermal media (no ribbon needed)Continue with step 5.
Thermal Transfer media (ribbon needed)a. If you have not already done so, load ribbon in the printer. SeeLoad the Ribbon on page 60.b. Continue with step 5.
  1. Close the media door.

ZEBRA ZT420 - Final Steps for Cutter Mode - 6

natural_image Line drawing of a mechanical device with an arrow indicating rotation or movement (no text or symbols present)
  1. Set the printer to Cutter mode (for more information, see Print Mode on page 69).

  2. Press PAUSE to exit pause mode and enable printing. The printer may perform a label calibration or feed a label, depending on your settings.

  3. If desired, perform the CANCEL Self Test on page 163 to verify that your printer is able to print. Media loading in Cutter mode is complete.

Load the Ribbon

ZEBRA ZT420 - Load the Ribbon - 1

Note • This section applies only to printers that have the Thermal Transfer option installed.

Ribbon is used only with thermal transfer labels. For direct thermal labels, do not load ribbon in the printer. To determine if ribbon must be used with a particular media, see When to Use Ribbon on page 18.

Caution • While performing any tasks near an open printhead, remove all rings, watches, hanging necklaces, identification badges, or other metallic objects that could touch the printhead. You are not required to turn off the printer power when working near an open printhead, but Zebra recommends it as a precaution. If you turn off the power, you will lose all temporary settings, such as label formats, and you must reload them before you resume printing.

ZEBRA ZT420 - Load the Ribbon - 2

Important • Use ribbon that is wider than the media to protect the printhead from wear. Ribbon must be coated on the outside.

To load ribbon, complete these steps:

  1. Raise the media door.

ZEBRA ZT420 - To load ribbon, complete these steps: - 1

natural_image Line drawing of a mechanical device with an arrow indicating rotational motion (no text or symbols)

ZEBRA ZT420 - To load ribbon, complete these steps: - 2

2.

Caution • The printhead may be hot and could cause severe burns. Allow the printhead to cool.

Open the printhead assembly by rotating the printhead-open lever.

ZEBRA ZT420 - To load ribbon, complete these steps: - 3

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Place the roll of ribbon on the ribbon supply spindle with the loose end of the ribbon unrolling as shown. Push the roll back as far as it will go.

ZEBRA ZT420 - To load ribbon, complete these steps: - 4

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Bring the ribbon under the printhead assembly, and then wrap it several turns around the ribbon take-up spindle.

ZEBRA ZT420 - To load ribbon, complete these steps: - 5

natural_image Diagram of a mechanical assembly with rotating components and directional arrows (no text or symbols)
  1. Is media already loaded in the printer?
If... Then...
NoContinue withstep 3 on page 35to load media in the printer.
Yesa. Rotate the printhead-open lever (1) downward until it locks the printhead in place.ZEBRA ZT420 - To load ribbon, complete these steps: - 6b. Close the media door.ZEBRA ZT420 - To load ribbon, complete these steps: - 7c. If necessary, press PAUSE to enable printing.

ZEBRA ZT420 - To load ribbon, complete these steps: - 8

Notes •

Printer Configuration and Adjustment

This section assists you with configuration of and adjustments to the printer.

Contents

Adjust Printer Settings 66

Print Settings 67

Calibration and Diagnostic Tools 71

Network Settings 77

RFID Settings....80

Language Settings....83

Sensor Settings 86

Port Settings 87

BlueTooth Settings 89

User Menus 90

Navigating through Screens in the Display 90

SETTINGS Menu 94

TOOLS Menu....97

NETWORK Menu. 102

RFID Menu....108

LANGUAGE Menu 111

SENSORS Menu 113

PORTS Menu. 115

BLUETOOTH Menu 117

Calibrate the Ribbon and Media Sensors 119

Adjust the Printhead Pressure 124

Remove Used Ribbon 128

Adjust Printer Settings

This section presents the printer settings that you can change and identifies the tools for changing them. These tools include the following:

  • ZPL and Set/Get/Do (SGD) commands (See the Zebra ^ Programming Guide for more information.)
  • The printer's user menus (See User Menus on page 90 for more information.)
  • The printer's web pages when the printer has an active wired or wireless print server connection (See the ZebraNet Wired and Wireless Print Servers User Guide for more information.)

Copies of the referenced manuals are available at http://www.zebra.com/manuals.

This section contains the following subsections:

• Print Settings on page 67
• Calibration and Diagnostic Tools on page 71
• Network Settings on page 77
• RFID Settings on page 80
• Language Settings on page 83
- Sensor Settings on page 86
- Port Settings on page 87
• BlueTooth Settings on page 89

Table 1 • Print Settings

Print DarknessSet the darkness to the lowest setting that provides good print quality. If you set the darkness too high, the label image may print unclearly, bar codes may not scan correctly, the ribbon may burn through, or the printhead may wear prematurely.If desired, use the FEED Self Test on page 165 to determine the best darkness setting.
Accepted values:0.0 - 30.0
Related ZPL command(s):^MD, ~SD
SGD command used:print.tone
User menu item:DARKNESS on page 94
Printer web page: View and Modify Printer Settings > General Setup > Darkness
Print SpeedSelect the speed for printing a label (given in inches per second). Slower print speeds typically yield better print quality.
Accepted values:2, 3, 4, 5, 6
Related ZPL command(s):^PR
SGD command used:media.speed
User menu item:PRINT SPEED on page 94
Printer web page: N/A
Media Type Select the type of media that you are using.If you select CONTINUOUS, you must include a label length in your label format (^LL if you are using ZPL).If you select GAP/NOTCH or MARK for various non-continuous media, the printer feeds media to calculate the label length.See Types of Media on page 16 for more information.

Table 1 • Print Settings (Continued)

Print MethodSpecify if the printer is to use Direct Thermal mode (no ribbon) or Thermal Transfer mode (using thermal transfer media and ribbon).
Accepted values:THERMAL TRANSDIRECT THERMAL
Related ZPL command(s):^MT
SGD command used:ezpl.print_method
User menu item:PRINT METHOD on page 94
Printer web page: View and Modify Printer Settings > Media Setup > Print Method
Tear-Off PositionIf necessary, adjust the position of the media over the tear-off bar after printing.Higher numbers move the media out (the tear line moves closer to the leading edge of the next label).Lower numbers move the media in (the tear line moves closer to the edge of the label just printed).ZEBRA ZT420 - Print Settings - 1
1Media direction
2Factory-set tear line location at position 000
Accepted values:-120 to 120
Related ZPL command(s):~TA
SGD command used:ezpl.tear_off
User menu item:TEAR OFF on page 95
Printer web page: View and Modify Printer Settings > General Setup > Tear Off
Print WidthSpecify the width of the labels being used. The default value is the maximum width for the printer, based on the printhead's DPI value.ZEBRA ZT420 - Print Settings - 2Note• Setting the width too narrow can result in portions of a label format not being printed on the media. Setting the width too wide wastes formatting memory and can cause the printer to print off of the label and onto the platen roller. This setting can affect the horizontal position of the label format if the image was inverted using the ^POI ZPL II command.
Accepted values:ZT410 203 dpi = 0002 to 832ZT410 300 dpi = 0002 to 1248ZT410 600 dpi = 0002 to 2496ZT420 203 dpi = 0002 to 1344ZT420 300 dpi = 0002 to 1984
Related ZPL command(s):^PW
SGD command used:ezpl.print_width
User menu item:PRINT WIDTH on page 95
Printer web page: View and Modify Printer Settings > Media Setup > Print Width
Print Mode Select a print mode that is compatible with your printer options.For information about how the print mode selections work with different printer options, see Select a Print Mode on page 30.
Reprint ModeWhen reprint mode is enabled, you can reprint the last label printed by pressing and holding PAUSE + CANCEL on the printer's control panel.
Accepted values:• ON• OFF
Related ZPL command(s):^JZ
SGD command used:ezpl.reprint_mode
User menu item:REPRINT MODE on page 95
Printer web page: N/A
Maximum Label LengthSet the maximum label length to a value that is at least 1.0 in. (25.4 mm) greater than the actual label length plus the interlabel gap. If you set the value to one that is smaller than the label length, the printer assumes that continuous media is loaded, and the printer cannot calibrate.For example, if the label length is 6.0 inches (152 mm) including the interlabel gap, set the parameter for at least 7.0 inches (178 mm).ZEBRA ZT420 - Print Settings - 3
1Label length (including interlabel gap)
2Interlabel gap
3Set the maximum label length to approximately this value
Accepted values:0 to the maximum label length supported by the printer
Related ZPL command(s):^ML
SGD command used:ezpl.label_length_max
User menu item:LABEL LENGTH MAX on page 96
Printer web page: View and Modify Printer Settings > Media Setup > Maximum Length

Calibration and Diagnostic Tools

Table 2 • Calibration and Diagnostic Tools

Print InformationPrint the specified information on one or more labels.
Accepted values:• SETTINGS—prints the printer configuration label.• NETWORK—prints the settings for any print server that is installed.• FORMATS—prints the available formats stored in the printer's RAM, Flash memory, or optional memory card.• IMAGES—prints the available images stored in the printer's RAM, Flash memory, or optional memory card.• FONTS—prints the available fonts in the printer, including standard printer fonts plus any optional fonts. Fonts may be stored in RAM or Flash memory.• BARCODES—prints the available bar codes in the printer. Bar codes may be stored in RAM or Flash memory.• ALL—prints the previous six labels.• SENSOR PROFILE—shows the sensor settings compared to actual sensor readings. To interpret the results of the sensor profile, see Sensor Profile on page 170.
Related ZPL command(s):Settings: ~WCNetwork: ~WLSensor profile: ~JGOthers: ^WD
SGD command used: none
User menu item:Settings: PRINT INFORMATION on page 97Network: PRINT INFORMATION on page 106Sensor profile: PRINT INFORMATION on page 113
Control panel key(s):Settings and Network: Do one of the following:Hold CANCEL during printer power-up.Hold FEED + CANCEL for 2 seconds when the printer is in the Ready state.Sensor profile: Hold FEED + CANCEL during printer power-up.
Printer web page: View and Modify Printer Settings >Print Listings on Label
LCD Contrast Change the contrast on the printer's display.
Accepted values:3 to 15
Related ZPL command(s): none
SGD command used:display.contrast
User menu item:LCD CONTRAST on page 97
Printer web page: N/A
Idle DisplaySelect the information shown on the printer's display when the printer is idle.
Accepted values:FW VERSIONIP ADDRESSMM/DD/YY 24 HRM/DD/YY 12 HRDD/MM/YY 24 HRDD/MM/YY 12 HR
Related ZPL command(s): none
SGD command used:device.idle_display_format
User menu item:IDLE DISPLAY on page 97
Printer web page: N/A
Power-Up Action Set the action for the printer to take during the power-up sequence.CALIBRATE adjusts sensor levels and thresholds, determines the label length, and feeds the media to the next web.FEED—feeds the labels to the first registration point.LENGTH determines the label length using current sensor values, and feeds the media to the next web.NO MOTION tells the printer not to move the media. You must manually ensure that the web is positioned correctly, or press feed to position the next web.SHORT CAL sets the media and web thresholds without adjusting sensor gain, determines the label length, and feeds the media to the next web.
Head-Close ActionSet the action for the printer to take when you close the printhead.CALIBRATE adjusts sensor levels and thresholds, determines the label length, and feeds the media to the next web.FEED—feeds the labels to the first registration point.LENGTH determines the label length using current sensor values, and feeds the media to the next web.NO MOTION tells the printer not to move the media. You must manually ensure that the web is positioned correctly, or press feed to position the next web.SHORT CAL sets the media and web thresholds without adjusting sensor gain, determines the label length, and feeds the media to the next web.
Accepted values:CALIBRATEFEEDLENGTHNO MOTIONSHORT CAL
Related ZPL command(s):^MF
SGD command used:ezpl.head_close_action
User menu item:HEAD CLOSE ACTION on page 98
Printer web page: View and Modify Printer Settings > Calibration
Head-Open LightSet the brightness of the light that turns on when the printhead is open.
Accepted values:HIGHMEDIUMLOWOFF
Related ZPL command(s):N/A
SGD command used:device.light.head_open_brightness
User menu item:HEAD OPEN LIGHT on page 98
Printer web page:N/A
Cover-Open LightSet the brightness of the light that turns on when the media door is open.
Accepted values:HIGHMEDIUMLOWOFF
Related ZPL command(s):N/A
SGD command used:device.light.cover_open_brightness
User menu item:COVER OPEN LIGHT on page 98
Printer web page:N/A
Load DefaultsRestore specific printer, print server, and network settings back to the factory defaults. Use care when loading defaults because you will need to reload all settings that you changed manually.FACTORY—Restores all printer settings other than the network settings back to the factory defaults. Use care when loading defaults because you will need to reload all settings that you changed manually.NETWORK—Reinitializes the printer's wired or wireless print server. With a wireless print server, the printer will also reassociate with your wireless network.LAST SAVED—Loads settings from the last permanent save.
Accepted values:FACTORYNETWORKLAST SAVED
Related ZPL command(s):Factory: ^JUFNetwork: ^JUNLast saved: ^JUR
SGD command used:none
User menu item:LOAD DEFAULTS on page 106
Control panel key(s):Factory: Hold FEED + PAUSE during printer power-up to reset the printer parameters to factory values.Network: Hold CANCEL + PAUSE during printer power-up to reset the network parameters to factory values.Last saved: N/A
Printer web page: Factory: Viewand Modify Printer Settings >RestoreDefault ConfigurationNetwork: Print Server Settings >Reset Print ServerLast saved: View and Modify Printer Settings >Restore Saved Configuration
Media and Ribbon Sensor CalibrationCalibrate the printer to adjust the sensitivity of the media and ribbon sensors. For complete instructions on how to perform a calibration procedure, see Calibrate the Ribbon and Media Sensors on page 119.
Accepted values:N/A
Related ZPL command(s):~JC
SGD command used:ezpl.manual_calibration
User menu item:MEDIA/RIBBON CAL on page 98
Control panel key(s):Hold PAUSE + FEED + CANCEL for 2 seconds to initiate calibration.
Printer web page:The calibration procedure cannot be initiated through the web pages. See the following web page for settings that are set during sensor calibration:View and Modify Printer Settings > CalibrationImportant • Do not change these settings unless you are told to do so by Zebra Technical Support or by an authorized service technician.
Communication Diagnostics ModeUse this diagnostics tool to cause the printer to output the hexadecimal values for all data received by the printer.For more information, see Communication Diagnostics Test on page 169.
Accepted values:• DISABLED• ENABLED
Related ZPL command(s):~JD to enable, ~JE to disable
SGD command used:device.diagnostic_print
User menu item:DIAGNOSTIC MODE on page 99
Control panel key(s):Hold PAUSE + FEED for 2 seconds when the printer is in the Ready state.
Printer web page: N/A
Enable ZBIZebra Basic Interpreter (ZBI 2.0TM) is a programming option that may be purchased for your printer. If you would like to purchase this option, contact your Zebra reseller for more information.
Accepted values: N/A
Related ZPL command(s):none
SGD command used:zbi.key (identifies if the ZBI 2.0 option is enabled or disabled on the printer)
User menu item:ZBI ENABLED? on page 99
Printer web page: N/A
Run a ZBI ProgramIf you have ZBI installed, you may choose to run a ZBI program that you have downloaded to your printer.
Accepted values:N/A
Related ZPL command(s):^JI, ~JI
SGD command used:zbi.control.run
User menu item:RUN ZBI PROGRAM on page 99
Printer web page: Directory Listing
Stop a ZBI ProgramIf your printer is running a ZBI program, you may stop that program.
Accepted values:N/A
Related ZPL command(s):~JQ
SGD command used:zbi.control. terminate
User menu item:STOP ZBI PROGRAM on page 99
Printer web page: Directory Listing

Network Settings

Table 3 • Network Settings

IP Address View and, if necessary, change the printer's IP address. Changes to this setting are saved only if IP PROTOCOL is set to PERMANENT. To allow any saved changes to take effect, reset the print server (seeReset Network on page 79).
Accepted values:000 to 255 for each field
Related ZPL command(s):^ND
SGD command used: Wired:internal_wired.ip.addrWireless: ip.addr, wlan.ip.addr
User menu item:WIRED IP ADDRESS on page 102
Printer web page: View and Modify Printer Settings >Network Communications Setup >TCP/IP Settings
Subnet MaskView and, if necessary, change the subnet mask.This menu item appears only if a wired or wireless print server is installed on your printer. To save changes to this setting, set IP PROTOCOL to PERMANENT, and then reset the print server (se cReset Network on page 79).
Accepted values:000 to 255 for each field
Related ZPL command(s):^ND
SGD command used: Wired:internal_wired.ip.netmaskWireless: wlan.ip.netmask
User menu item: WIRED SUBNET MASK on page 102
Printer web page: View and Modify Printer Settings >Network Communications Setup >TCP/IP Settings
Gateway View and, if necessary, change the default gateway.This menu item appears only if a wired or wireless print server is installed on your printer. To save changes to this setting, setIP PROTOCOL to PERMANENT, and then reset the print server (se cReset Network on page 79).
IP ProtocolThis parameter tells if the user (permanent) or the server (dynamic) selects the IP address. When a dynamic option is chosen, this parameter tells the method(s) by which the wired or wireless print server receives the IP address from the server.
Accepted values:• ALL• GLEANING ONLY• RARP• BOOTP• DHCP• DHCP & BOOTP• PERMANENT
Related ZPL command(s):^ND
SGD command used: Wired:internal_wired.ip.protocolWireless: wlan.ip.protocol
User menu item:WIRED IP PROTOCOL on page 103
Printer web page: View and Modify Printer Settings >Network Communications Setup >TCP/IP Settings
MAC AddressView the Media Access Control (MAC) address of the print server that is installed in the printer (wired or wireless).
Accepted values:N/A
Related ZPL command(s):none
SGD command used: Wired:internal_wired.mac_addrWireless: wlan.mac_addr
User menu item:WIRED MAC ADDRESS on page 103
Printer web page: View and Modify Printer Settings >Network Communications Setup >Wireless Setup
ESSID The Extended Service Set Identification (ESSID) is an identifier for your wireless network. This setting, which cannot be modified from the control panel, gives the ESSID for the current wireless configuration.
ChannelView the wireless channel being used when the wireless network is active and authenticated.
Accepted values:N/A
Related ZPL command(s):none
SGD command used:wlan.channel
User menu item: CHANNEL onpage 105
Printer web page: View and Modify Printer Settings >Network Communications Setup >Wireless Setup
SignalView the wireless signal strength when the wireless network is active and authenticated.
Accepted values:N/A
Related ZPL command(s):none
SGD command used:wlan.signal_strength
User menu item: SIGNAL on page 105
Printer web page: View and Modify Printer Settings >Network Communications Setup >Wireless Setup
Reset NetworkThis option resets the wired or wireless print server. You must reset the print server to allow any changes to the network settings to take effect.
Accepted values:N/A
Related ZPL command(s):~WR
SGD command used:device.reset
User menu item:RESET NETWORK on page 106
Printer web page:Print Server Settings >Factory Print Server Settings

RFID Settings

Table 4 • RFID Settings

RFID Status Displaythe status of the RFID subsystem of the printer.
Accepted values:N/A
Related ZPL command(s):^HL or ~HL
SGD command used:rfid.error.response
User menu item:RFID STATUS on page 108
Printer web page:N/A
Read RFID DataRead and return the specified tag data from the RFID tag located over the RFID antenna. No printer movement occurs while tag data is being read. The printhead can be open or closed.
Accepted values:epc = reads the first 128 bits of EPC data tid information = reads the first 32 bits of the TID (Tag ID) password status = reads the tag's access and kill passwords protocol bits = reads the protocol bits from the EPC memory banks and converts that value to the EPC size memory bank sizes = reads the EPC, TID, and user memory banks sizes
Related ZPL command(s):^RF
SGD command used:rfid.tag.read.content and rfid.tag.read.execute
User menu item:READ RFID DATA on page 108
Printer web page: N/A
RFID TestDuring the RFID test, the printer attempts to read and write to a transponder. No printer movement occurs with this test.
Accepted values:quick = performs a read EPC test and a write EPC test (using random data) read = performs a read EPC test write = performs a write EPC test (using random data)
Related ZPL command(s):N/A
SGD command used:rfid.tag.test.content and rfid.tag.test.execute
User menu item: RFID TEST onpage 109
Printer web page:N/A
Programming PositionIf the desired programming position (read/write position) is not achieved through RFID tag calibration, a value may be specified. See theRFID Programming Guide 3 for more information.
Accepted values:F0 to Fxxx (where xxx is the label length in millimeters or 999, whichever is less)The printer feeds the label forward for the specified distance and then begins programming.B0 to B30The printer backfeeds the label for the specified distance and then begins programming. To account for the backfeed, allow empty media liner to extend out of the front of the printer when using a backward programming position.
Related ZPL command(s):^RS
SGD command used:rfid.position.program
User menu item:RFID PROGRAM POS. on page 109
Printer web page: View and Modify Printer Settings > RFID Setup >PROGRAM POSITION
RFID Antenna ElementIf the desired antenna is not achieved through RFID tag calibration, a value may be specified.ZEBRA ZT420 - RFID Settings - 1 Note • This parameter does not apply to ZD500R printers, which always use an antenna element value of A1.
Accepted values:A1, A2, A3, A4B1, B2, B3, B4C1, C2, C3, C4D1, D2, D3, D4E1, E2, E3, E4
Related ZPL command(s):^RW
SGD command used:rfid.reader_1.antenna_port
User menu item:RFID ANTENNA on page 109
Printer web page:View and Modify Printer Settings > RFID Setup >RFID ANTENNA
RFID Read PowerIf the desired read power is not achieved through RFID tag calibration, a value may be specified.
Accepted values:0 to 30
Related ZPL command(s):^RW
SGD command used:rfid.reader_1.power.read
User menu item: RFID READ POWER on page 109
Printer web page: View and Modify Printer Settings > RFID Setup > RFID READ PWR
RFID Write PowerIf the desired write power is not achieved through RFID tag calibration, a value may be specified.
Accepted values:0 to 30
Related ZPL command(s):^RW
SGD command used:rfid.reader_1.power.write
User menu item: RFID WRITE POWER on page 109
Printer web page: View and Modify Printer Settings > RFID Setup > RFID WRITE PWR
RFID Valid CounterResets the RFID valid label counter to zero.
Accepted values:N/A
Related ZPL command(s):~RO
SGD command used:odometer.rfid.valid_resettable
User menu item: RFID VALID COUNT on page 110
Printer web page: N/A
RFID Void CounterResets the RFID void label counter to zero.
Accepted values:N/A
Related ZPL command(s):~RO
SGD command used:odometer.rfid(void_resettable
User menu item: RFID VOID COUNT on page 110
Printer web page: N/A
RFID Tag CalibrationInitiate tag calibration for RFID media. (Not the same as media and ribbon calibration.)
Accepted values:N/A
Related ZPL command(s):^HR
SGD command used: rfid.tag.calibrate
User menu item: RFID CALIBRATE on page 108
Printer web page: N/A

Language Settings

Table 5 • Language Settings

Language If necessary, change the language that the printer displays.This change affects the words shown on the following:the Home menuthe user menuserror messagesthe printer configuration label, the network configuration label, and other labels that you can select to print through the user menusNote • The selections for this parameter are displayed in their native languages.ZEBRA ZT420 - Language Settings - 1
Accepted values:ENGLISH, SPANISH, FRENCH, GERMAN, ITALIAN, NORWEGIAN, PORTUGUESE, SWEDISH, DANISH, SPANISH 2, DUTCH, FINNISH, CZECH, JAPANESE, KOREAN, ROMANIAN, RUSSIAN, POLISH, SIMPLIFIED CHINESE, TRADITIONAL CHINESE
Related ZPL command(s):^KL
SGD command used: displaylanguage
User menu item:(SETTINGS menu) LANGUAGE on page 96(LANGUAGE menu) LANGUAGE on page 111
Printer web page: View and Modify Printer Settings > General Setup >Language
ZPLOverrideEnable this menu item to prevent the following ZPL commands from changing the printer's current settings:^MM (print mode)^MT (Direct Thermal or Thermal Transfer print method)^MN (media type non-continuous or continuous)When this menu item is disabled, these commands override the printer's settings.
Accepted values:DISABLEDENABLED
Related ZPL command(s):none
SGD command used:zpl.zpl_override
User menu item:ZPL OVERRIDE on page 111
Printer web page:none
Command CharacterThe format command prefix is a two-digit hex value used as a parameter place marker in ZPL/ZPL II format instructions. The printer looks for this hex character to indicate the start of a ZPL/ZPL II format instruction.Set the format command character to match what is used in your label formats.ZEBRA ZT420 - Language Settings - 2 Important • You cannot use the same hex value for the format command prefix, control character, and delimiter characters. The printer must see different characters to work properly. If you are setting the value through the control panel, the printer will skip any value that is already in use.
Accepted values: 00 to FF
Related ZPL command(s):^CC or ~CC
SGD command used: zpl.caret
User menu item:COMMAND CHAR on page 111
Printer web page: View and Modify Printer Settings >ZPL Control
Control CharacterThe printer looks for this two-digit hex character to indicate the start of a ZPL/ZPL II control instruction.Set the control prefix character to match what is used in your label formats.
Accepted values: 00 to FF
Related ZPL command(s):^CT or ~CT
SGD command used:zpl.control_character
User menu item:CONTROL CHAR on page 111
Printer web page: View and Modify Printer Settings >ZPL Control
Delimiter CharacterThe delimiter character is a two-digit hex value used as a parameter place marker in ZPL/ZPL II format instructions.Set the delimiter character to match what is used in your label formats.
Accepted values: 00 to FF
Related ZPL command(s):^CD or ~CD
SGD command used: zpl.delimiter
User menu item:DELIMITER CHAR on page 112
Printer web page: View and Modify Printer Settings >ZPL Control
ZPL Mode Select the mode that matches what is used in your label formats.This printer accepts label formats written in either ZPL or ZPL II, eliminating the need to rewrite any ZPL formats that already exist. The printer remains in the selected mode until it is changed in one of the ways listed here.
Accepted values:• ZPL II• ZPL
Related ZPL command(s):^SZ
SGD command used:zpl.zpl_mode
User menu item:ZPL MODE on page 112
Printer web page: View and Modify Printer Settings > ZPL Control

Sensor Settings

Table 6 • Sensor Settings

Sensor TypeSelect the media sensor that is appropriate for the media that you are using. The reflective sensor typically is used only for black mark media. The transmissive sensor typically is used for other media types.
Accepted values:• TRANSMISSIVE• REFLECTIVE
Related ZPL command(s):^JS
SGD command used:device.sensor_select
User menu item:SENSOR TYPE on page 113
Printer web page: View and Modify Printer Settings > Media Setup
Label Sensor Set the sensitivity of the label sensor.ZEBRA ZT420 - Sensor Settings - 1 Important • This value is set during sensor calibration. Do not change this setting unless you are told to do so by Zebra Technical Support or by an authorized service technician.
Take Label Set the intensity of the take label LED.ZEBRA ZT420 - Sensor Settings - 2 Important • This value is set during sensor calibration. Do not change this setting unless you are told to do so by Zebra Technical Support or by an authorized service technician.

Port Settings

Table 7 • Port Settings

Baud RateSelect the baud value that matches the one being used by the host computer.
Accepted values:115200576003840028800192001440096004800
Related ZPL command(s):^SC
SGD command used:comm.baud
User menu item:BAUD RATE on page 115
Printer web page: View and Modify Printer Settings >Serial Communications Setup
Data BitsSelect the data bits value that matches the one being used by the host computer.
Accepted values:78
Related ZPL command(s):^SC
SGD command used:comm.data_bits
User menu item:DATA BITS on page 115
Printer web page: View and Modify Printer Settings >Serial Communications Setup
ParitySelect the parity value that matches the one being used by the host computer.
Accepted values:NONE EVEN ODD
Related ZPL command(s):^SC
SGD command used:comm.parity
User menu item:PARITY on page 115
Printer web page: View and Modify Printer Settings >Serial Communications Setup
Host HandshakeSelect the handshake protocol that matches the one being used by the host computer.
Accepted values:• XON/XOFF• RTS/CTS• DSR/DTR
Related ZPL command(s):^SC
SGD command used:comm.handshake
User menu item:HOST HANDSHAKE on page 115
Printer web page: View and Modify Printer Settings >Serial Communications Setup

BlueTooth Settings

Table 8 • BLUETOOTH Menu

Bluetooth AddressDisplays the printer's Bluetooth Device Address
Accepted values:N/A
SGD command used:bluetooth.address
ModeDisplays the Bluetooth connection pair printer's device type—Slave (typical) or Master.
Accepted values: N/A
SGD command used:N/A
Discovery Select if the printer is “Discoverable” for Bluetooth device pairing.
Connected Displays the Bluetooth connection status to its paired device (Yes or No).
BT Spec Version Displays the Bluetooth operational specification level.
Min. Security ModeDisplays the printer's Bluetooth minimum level of applied security.
Accepted values:N/A
SGD command used: N/A

User Menus

The printer's control panel includes a display, where you can view the printer's status or change its operating parameters. In this section, you will learn how to navigate through the printer's menu system and change values for menu items.

Idle Display After the printer completes the power-up sequence, it moves to the Idle Display (Figure 1). The printer cycles through its IP address and information configured by the user.

Figure 1 • Idle Display
PRINTER READY V75.19.6Z 1 2

1The printer's current status
2Information that is set through Idle Display on page 72
Home menu shortcut

Home Menu The printer's operating parameters are sorted into eight user menus, which you can access through the printer's Home menu (Figure 2). For detailed information about changing the printer settings, see Adjust Printer Settings on page 66.

Figure 2 • Home Menu
HOME MENU ABC SETTINGS

See SETTINGS Menu on page 94.
See LANGUAGE Menu on page 111.
See TOOLS Menu on page 97.
See SENSORS Menu on page 113.
See NETWORK Menu on page 102.
See PORTS Menu on page 115.
RFID — See RFID Menu on page 108.
See BLUETOOTH Menu on page 117.
Exit and return to the Idle Display (Figure 1).

Navigation Table 9 shows the options available for navigating through the screens in the control panel display.

Table 9 • Navigation
Idle Display
XXXXXXXX XXXXXXXX HUA HOME MENU SETTINGS

At the Idle Display (Figure 1 on page 90), press LEFT SELECT to go to the printer's Home menu (Figure 2 on page 91).

Home Menu
新日送办品 12.00 30.00 12.00 12.00 11 0% X 96:01 022 144.2

To move from icon to icon in the Home menu, press any of the ARROW buttons.

When an icon is selected, its colors are reversed to highlight it.

ZEBRA ZT420 - Navigating through Screens in the Display - 5

ZEBRA ZT420 - Navigating through Screens in the Display - 6

SETTINGS menu icon

SETTINGS menu icon highlighted

Mobile phone interface screenshot showing control buttons and navigation icons

Press LEFT SELECT to exit the Home menu and return to the Idle Display. The printer automatically returns to the Idle Display after 15 seconds of inactivity in the Home menu.

Table 9 • Navigation (Continued)

User Menus
ZEBRA ZT420 - Navigating through Screens in the Display - 8ZEBRA ZT420 - Navigating through Screens in the Display - 9
Press LEFT SELECT to return to the Home menu. The printer automatically returns to the Home menu after 15 seconds of inactivity in a user menu.▼ and ▲ indicate that a value can be changed. Any changes that you make are saved immediately. Press the UP ARROW or DOWN ARROW to scroll through accepted values.
ZEBRA ZT420 - Navigating through Screens in the Display - 10ZEBRA ZT420 - Navigating through Screens in the Display - 11
To scroll through the items in a user menu, press the LEFT ARROW or RIGHT ARROW.A word in the bottom-right corner of the display indicates an available action. Press OK or press RIGHT SELECT to perform the action shown.

ZEBRA ZT420 - Navigating through Screens in the Display - 12

SETTINGS Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see Print Settings on page 67.

DARKNESS ▼ 10.0 ▲ ↑

Adjust the Print Darkness

Set the darkness to the lowest setting that provides good print quality. If you set the darkness too high, the label image may print unclearly, bar codes may not scan correctly, the ribbon may burn through, or the printhead may wear prematurely.

See Print Darkness on page 67 for more information.

PRINT SPEED ▼ 6.0 ▲ ↑

Select the Print Speed

Select the speed for printing a label (given in inches per second). Slower print speeds typically yield better print quality.

See Print Speed on page 67 for more information.

MEDIA TYPE ▼ GAP/NOTCH ▲

Set the Media Type

Select the type of media that you are using.

See Media Type on page 67 for more information.

PRINT METHOD ▼ THERMAL TRANS ▲

Select the Print Method

Specify if the printer is to use Direct Thermal mode (no ribbon) or Thermal Transfer mode (using thermal transfer media and ribbon).

See Print Method on page 68 for more information.

TEAR OFF ▼ 0 ▲ ↑

Adjust the Tear-Off Position

If necessary, adjust the position of the media over the tear-off bar after printing.

See Tear-Off Position on page 68 for more information.

PRINT WIDTH ▼ 832 ▲ ↑

Adjust the Print Width

Specify the width of the labels being used. The default value is the maximum width for the printer, based on the printhead's DPI value.

See Print Width on page 69 for more information.

PRINT MODE TEAR OFF ▲

Select the Print Mode

Select a print mode that is compatible with your printer options.

See Print Mode on page 69 for more information.

LEFT POSITION ▼ 0 ▲ ↑

Adjust the Label Left Position

If necessary, shift the print position horizontally on the label. Positive numbers move the left edge of the image toward the center of the label by the number of dots selected, while negative numbers move the left edge of the image toward the left edge of the label.

See Label Left Position on page 69 for more information.

REPRINT MODE ▼ OFF ▲

Set the Reprint Mode

When reprint mode is enabled, you can reprint the last label printed either by issuing certain commands or by pressing the LEFT ARROW on the control panel.

See Reprint Mode on page 70 for more information.

LABEL LENGTH MAX ▼ 39 ▲ ↑

Set the Maximum Label Length

Set the maximum label length to a value that is at least 1.0 in. (25.4 mm) greater than the actual label length plus the interlabel gap. If you set the value to one that is smaller than the label length, the printer assumes that continuous media is loaded, and the printer cannot calibrate.

See Maximum Label Length on page 70 for more information.

LANGUAGE ENGLISH

Select the Display Language

If necessary, change the language that the printer displays. See Language on page 83 for more information.

ZEBRA ZT420 - Select the Display Language - 1

Note • The selections for this parameter are displayed in the actual languages to make it easier for you to find one that you are able to read.

TOOLS MENU ↑ GO

Tools Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

PRINT INFORMATION SETTINGS START

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - Tools Menu Shortcut - 2

flowchart
graph LR
    A["LANGUAGE ENGLISH"] --> B["GO"]
    B --> C["DARKNESS 18 START"]

ZEBRA ZT420 - Tools Menu Shortcut - 3

TOOLS Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see Table 2, Calibration and Diagnostic Tools on page 71.

PRINT INFORMATION ▼ SETTINGS ▲ PRINT

List the Printer Information\*

Prints a printer configuration label.

See Print Information on page 71 for more information.

* Other options are available by scrolling.

LCD CONTRAST ▼ 10 ▲ ↑

Set the Display Contrast

Change the contrast on the printer's display.

See LCD Contrast on page 72 for more information.

IDLE DISPLAY FW VERSION ↑

Select the Idle Display

Select the information shown on the printer's display when the printer is idle.

See Idle Display on page 72 for more information.

POWER UP ACTION ▼ CALIBRATE ▲

Set the Power-Up Action

Set the action for the printer to take during the power-up sequence.

See Power-Up Action on page 72 for more information.

HEAD CLOSE ACTION ▼ CALIBRATE ▲

Set the Head-Close Action

Set the action for the printer to take when you close the printhead.

See Head-Close Action on page 73 for more information.

HEAD OPEN LIGHT ▼ HIGH ▲

Set the Head-Open Light Action

Set the brightness of the light that turns on when the printhead is open.

COVER OPEN LIGHT ▼ HIGH ▲ ↑

Set the Cover Open Light Action

Set the brightness of the light that turns on when the media door is open.

LOAD DEFAULTS ▼ FACTORY ▲ LOAD

Load Printer Defaults\*

Use this menu item to restore all settings other than the network settings back to the factory defaults. Use care when loading defaults because you will need to reload all settings that you changed manually.

See Load Defaults on page 74 for more information.

* Other options are available by scrolling.

MEDIA/RIBBON CAL START

Calibrate the Media and Ribbon Sensors

Use this menu item to adjust the sensitivity of the media and ribbon sensors.

See Media and Ribbon Sensor Calibration on page 75 for more information. For instructions on how to perform a calibration procedure, see Calibrate the Ribbon and Media Sensors on page 119.

DIAGNOSTIC MODE DISABLED

Enable Communication Diagnostics Mode

Use this diagnostics tool to cause the printer to output the hexadecimal values for all data received by the printer.

See Communication Diagnostics Mode on page 75 for more information.

ZBI ENABLED? NO

Is ZBI Enabled?

This menu item indicates if the Zebra Basic Interpreter (ZBI 2.0 ^TM ) option is enabled on your printer. If you would like to purchase this option, contact your Zebra reseller for more information.

See Enable ZBI on page 76 for more information.

RUN ZBI PROGRAM (*NONE*) ▲ ↑ RUN

Run a ZBI Program\*

If ZBI programs exist on your printer, they are listed. If no program exists, NONE is listed.

If you wish to run a ZBI program that you have downloaded to your printer:

  1. Use the UP ARROW or DOWN ARROW to select the file from this menu.
  2. Press RIGHT SELECT to select RUN. If no program exists, the RUN option does not perform an action.

See Run a ZBI Program on page 76 for more information.

* This menu item appears only if ZBI is enabled on your printer and no ZBI program is running.

STOP ZBI PROGRAM (*NONE*) ▲ ↑ STOP

Stop a ZBI Program\*

If a ZBI program is running, the printer lists it. If you wish to stop the program, press RIGHT SELECT to select STOP.

See Stop a ZBI Program on page 76 for more information.

* This menu item appears only if ZBI is enabled on your printer and a ZBI program is running.

PRINT USB FILE ▼ SELECT ALL ▲ PRINT

Use this menu item to select files to print from a USB Flash drive.

  1. Use the UP ARROW or DOWN ARROW to select one file or all files from this menu.
  2. Press RIGHT SELECT to select PRINT.

* This menu item appears only if a USB Flash drive is inserted into the USB host port on the printer.

COPY USB FILE TO E: ▼ SELECT ALL ▲ COPY

Save a File from a USB Flash Drive to the Printer\*

Use this menu item to copy files from a USB Flash drive to your printer.

  1. Use the UP ARROW or DOWN ARROW to select one file or all files from this menu.
  2. Press RIGHT SELECT to select COPY.

* This menu item appears only if a USB Flash drive is inserted into the USB host port on the printer.

STORE E: FILE TO USB ▼ SELECT ALL ▲ ↑ STORE

Save a File from the Printer to a USB Flash Drive\*

Use this menu item to save files from your printer to a USB Flash drive.

  1. Use the UP ARROW or DOWN ARROW to select one file or all files from this menu.
  2. Press RIGHT SELECT to select STORE.

* This menu item appears only if a USB Flash drive is inserted into the USB host port on the printer.

PRINT STATION

Fill in a Form and Print a Label Format from the Display

Use this menu item to fill in variable fields in a label format and print the label using a Human Input Device (HID), such as a USB keyboard or scanner. A suitable label format must be stored on the E: drive of the printer to use this option.

When the printer finds an HID plugged into the printer's USB host port, it uses this user menu to prompt you to select a form on the printer's E: drive. After you have been prompted to fill in each variable ^FN field on the form, you can specify the desired quantity of labels to print.

For more information about using the ^FN command, refer to the Zebra Programming Guide. You can download a copy of the manual from http://www.zebra.com/manuals/.

NETWORK MENU GO

Network Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

ZEBRA ZT420 - Network Menu Shortcut - 1

flowchart
graph TD
    A["GO"] --> B["NO PRINT SERVER INSTALLED"]
    A --> C["IP ADDRESS 000,000,000,000"]
    A --> D["Next"]

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - Network Menu Shortcut - 2

flowchart
graph LR
    A["STORE E: FILE TO USB SELECT ALL"] --> B["GO"]
    B --> C["PRINT INFORMATION SETTINGS"]
    C --> D["START"]
    A -->|STORE| E
    B -->|PRINT| F

ZEBRA ZT420 - Network Menu Shortcut - 3

NETWORK Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see Table 3, Network Settings on page 77. For more information about print servers and how they function, refer to the Wired and Wireless Print Server User Guide. A copy of this manual is available at http://www.zcbra.com/manuals.

ACTIVE PRINT SERVER INTERNAL WIRED

View the Active Print Server

Only one print server (wired or wireless) can be installed at a time. Therefore, the print server installed is the active print server.

PRIMARY NETWORK WIRED

View the Active Print Server

Only one print server (wired or wireless) can be installed at a time. Therefore, the print server installed is the active print server.

WIRED IP ADDRESS ▼ 000.000.000.000 ▲ NEXT

Set the Printer's IP Address

View and, if necessary, change the printer's IP address.

Changes are saved only if WIRED IP PROTOCOL on page 103 is set to PERMANENT. To allow any saved changes to take effect, use RESET NETWORK on page 106 to reset the print server.

See IP Address on page 77 for more information.

WIRED SUBNET MASK ▼ 000.000.000.000 ▲ NEXT

Set the Subnet Mask

View and, if necessary, change the subnet mask.

Changes are saved only if WIRED IP PROTOCOL on page 103 is set to PERMANENT. To allow any saved changes to take effect, use RESET NETWORK on page 106 to reset the print server.

See Subnet Mask on page 77 for more information.

WIRED GATEWAY ▼ 000.000.000.000 ▲ ↑ NEXT

Set the Default Gateway

View and, if necessary, change the default gateway.

Changes are saved only if WIRED IP PROTOCOL on page 103 is set to PERMANENT. To allow any saved changes to take effect, use RESET NETWORK on page 106 to reset the print server.

See Gateway on page 77 for more information.

WIRED IP PROTOCOL ▼ all ▲ ↑

Set the IP Resolution Method

This parameter tells if the user (permanent) or the server (dynamic) selects the IP address. When a dynamic option is chosen, this parameter tells the method(s) by which the wired or wireless print server receives the IP address from the server.

See IP Protocol on page 78 for more information.

WIRED MAC ADDRESS 00:05:9A:3C:78:00

View the MAC Address

View the Media Access Control (MAC) address of the print server that is installed in the printer (wired or wireless).

See MAC Address on page 78 for more information.

IP PORT 6101

View the Primary TCP/IP Port

View the Ethernet TCP port number, over which labels and commands can be sent for processing.

* This menu item, which cannot be modified from the control panel, appears only if a wired or wireless print server is installed in your printer.

IP ALTERNATE PORT 9100

View the Alternate TCP/IP Port

View the alternate Ethernet TCP port number, over which labels and commands can be sent for processing.

* This menu item, which cannot be modified from the control panel, appears only if a wired or wireless print server is installed in your printer.

WLAN IP ADDRESS ▼ 000.000.000.000 ▲ ↑ NEXT

Set the Printer's IP Address\*

View and, if necessary, change the printer's IP address.

Changes are saved only if WIRED IP PROTOCOL on page 103 is set to PERMANENT. To allow any saved changes to take effect, use RESET NETWORK on page 106 to reset the print server.

See IP Address on page 77 for more information.

* This menu item appears only if a wireless print server is installed in your printer.

WLAN SUBNET MASK ▼ 000.000.000.000 ▲ ↑ NEXT

Set the Subnet Mask\*

View and, if necessary, change the subnet mask.

Changes are saved only if WIRED IP PROTOCOL on page 103 is set to PERMANENT. To allow any saved changes to take effect, use RESET NETWORK on page 106 to reset the print server.

See Subnet Mask on page 77 for more information.

* This menu item appears only if a wireless print server is installed in your printer.

WLAN GATEWAY ▼ 000.000.000.000 ▲ ↑ NEXT

Set the Default Gateway\*

View and, if necessary, change the default gateway.

Changes are saved only if WIRED IP PROTOCOL on page 103 is set to PERMANENT. To allow any saved changes to take effect, use RESET NETWORK on page 106 to reset the print server.

See Gateway on page 77 for more information.

* This menu item appears only if a wireless print server is installed in your printer.

WLAN IP PROTOCOL ▼ all ▲ ↑

Set the IP Resolution Method\*

This parameter tells if the user (permanent) or the server (dynamic) selects the IP address. When a dynamic option is chosen, this parameter tells the method(s) by which the wired or wireless print server receives the IP address from the server.

See IP Protocol on page 78 for more information.

* This menu item appears only if a wireless print server is installed in your printer.

WLAN MAC ADDRESS 00:05:9A:3C:78:00

View the MAC Address\*

View the Media Access Control (MAC) address of the print server that is installed in the printer (wired or wireless).

See MAC Address on page 78 for more information.

* This menu item, which cannot be modified from the control panel, appears only if a wireless print server is installed in your printer.

ESSID 125

View the ESSID Value\*

The Extended Service Set Identification (ESSID) is an identifier for your wireless network. This setting, which cannot be modified from the control panel, gives the ESSID for the current wireless configuration.

See ESSID on page 78 for more information.

* This menu item, which cannot be modified from the control panel, appears only if a wireless print server is installed in your printer.

CHANNEL

View the Channel Value\*

View the wireless channel being used when the wireless network is active and authenticated. No value indicates that you have no a wireless connection.

See Channel on page 79 for more information.

* This menu item, which cannot be modified from the control panel, appears only if a wireless print server is installed in your printer.

SIGNAL 0

View the Signal Value\*

View the wireless signal strength when the wireless network is active and authenticated. A value of zero indicates that you have no wireless connection.

See Signal on page 79 for more information.

* This menu item, which cannot be modified from the control panel, appears only if a wireless print server is installed in your printer.

PRINT INFORMATION NETWORK PRINT

This option prints a network configuration label, which lists the settings for any print server that is installed.

See Print Information on page 71 for more information.

* Other options are available by scrolling.

RESET NETWORK ↑ RESET

Reset the Network Settings\*

This option resets the wired or wireless print server. You must reset the print server to allow any changes to the network settings to take effect.

See Reset Network on page 79 for more information.

* This menu item appears only if a wired or wireless print server is installed in your printer.

LOAD DEFAULTS NETWORK LOAD

Load Network Defaults\*

Use this menu item to restore all print server and network settings back to the factory defaults. Use care when loading defaults because you will need to reload all settings that you changed manually.

See Load Defaults on page 74 for more information.

* This menu item appears only if a wired or wireless print server is installed in your printer. Other options are available by scrolling.

RFID MENU ↑ GO

RFID Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

GO → LANGUAGE ENGLISH

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - RFID Menu Shortcut - 2

flowchart
graph LR
    A["LOAD DEFAULTS NETWORK"] --> B["GO"]
    B --> C["RFID STATUS RFID OK NEXT"]
    C --> A

ZEBRA ZT420 - RFID Menu Shortcut - 3

RFID Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see Table 4, RFID Settings on page 80.

RFID COUNTRY CODE NOT SELECTED

Select the RFID Country Code

Select the RFID country code (if applicable).

ZEBRA ZT420 - Select the RFID Country Code - 1

Note • A prompt for the country code appears only on some printers the first time that they are powered up, depending on the world region to which the printers were shipped. Specify the appropriate country to access the printer's RFID features.

RFID STATUS RFID OK

View the RFID Status

This parameter displays the status of the RFID subsystem of the printer. During an error condition, an error message displays.

See RFID Status on page 80 for more information.

RFID CALIBRATE START

Perform RFID Tag Calibration

Initiate tag calibration for RFID media.

See RFID Tag Calibration on page 82 for more information.

READ RFID DATA EPC 12345ABC12345ABC124 5ABC

Read and Display the RFID Tag Data

When this option is selected, the reader attempts to read the specified information from an RFID tag, even if the printhead is open. No printer movement occurs while tag data is being read.

If you wish to read and display the information stored in an RFID tag:

  1. Position the RFID label with its transponder over the RFID antenna.
  2. Use the UP ARROW or DOWN ARROW to select the type of information that you want read and displayed.
  3. Press RIGHT SELECT to select READ. The results of the test are shown on the display.

See Read RFID Data on page 80 for more information.

RFID TEST READ OK WRITE OK

Perform an RFID Test

During the RFID test, the printer attempts to read and write to a transponder. No printer movement occurs with this test.

If you wish to test an RFID label:

  1. Position the RFID label with its transponder over the RFID antenna array.
  2. Press RIGHT SELECT to select START. The results of the test are shown on the display.

See RFID Test on page 80 for more information.

RFID PROGRAM POS. ▼ F0 ▲

Display or Change the RFID Programming Position

This menu item displays the current programming position. If the desired programming position is not achieved through RFID tag calibration, a value may be specified.

See Programming Position on page 81 for more information.

RFID ANTENNA ▼ A1 ▲ http

Display or Change the RFID Antenna Element

This menu item displays the RFID antenna element in use. If the desired antenna element is not selected through RFID tag calibration, a value may be specified.

See RFID Antenna Element on page 81 for more information.

RFID READ POWER ▼ 16 ▲ ↑

Display or Change the RFID Read Power

This menu item displays the current read power setting. If the desired read power is not achieved through RFID tag calibration, a value may be specified.

See RFID Read Power on page 82 for more information.

RFID WRITE POWER ▼ 16 ▲ ↑

Display or Change the RFID Write Power

This menu item displays the current write power setting. If the desired write power is not achieved through RFID tag calibration, a value may be specified.

See RFID Write Power on page 82 for more information.

RFID VALID COUNT 0 RESET

Display or Reset the RFID Valid Counter

Displays the RFID valid label count or resets the counter to zero.

See RFID Valid Counter on page 82 for more information.

RFID VOID COUNT 0 RESET

Display or Reset the RFID Void Counter

Displays the RFID void label count or resets the counter to zero.

See RFID Void Counter on page 82 for more information.

LANGUAGE MENU ↑ GO

Language Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

GO Language ENGLISH

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - Language Menu Shortcut - 2

flowchart
graph LR
    A["RFID VOID COUNT RFID INPUT"] --> B["GO"]
    B --> C["RFID OK"]
    C --> D["NEXT"]

ZEBRA ZT420 - Language Menu Shortcut - 3

LANGUAGE Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see Table 5, Language Settings on page 83.

LANGUAGE ▼ ENGLISH ▲ ↑

Select the Display Language

If necessary, change the language that the printer displays.

See Language on page 83 for more information.

ZEBRA ZT420 - Select the Display Language - 1

Note • The selections for this parameter are displayed in the actual languages to make it easier for you to find one that you are able to read.

ZPL OVERRIDE DISABLED

Enable ZPL Override

Enable this menu item to allow certain ZPL commands to override the printer's current settings.

See ZPL Override on page 83 for more information.

COMMAND CHAR ▼ ^ ( 5 E ) ▲ #

Set the Command Character Value

Set the format command character to match what is used in your label formats.

See Command Character on page 84 for more information.

CONTROL CHAR ~ ( 7 E ) ▲

Set the Control Character Value

Set the control prefix character to match what is used in your label formats.

See Control Character on page 84 for more information.

DELIMITER CHAR ▼ , ( 2 C ) ▲ ↑

Set the Delimiter Character Value

Set the delimiter character to match what is used in your label formats.

See Delimiter Character on page 84 for more information.

ZPL MODE ZPL II

Set the ZPL Mode

Select the mode that matches what is used in your label formats.

See ZPL Mode on page 85 for more information.

SENSORS MENU ↑ GO

Sensors Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

GO SENSOR TYPE TRANSMISSIVE

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - Sensors Menu Shortcut - 2

flowchart
graph LR
    A["ZPL MODE ZPL II"] --> B["Central Device"]
    C["LANGUAGE ENGLISH"] --> B
    B --> D["Return to Device"]

ZEBRA ZT420 - Sensors Menu Shortcut - 3

SENSORS Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see Table 6, Sensor Settings on page 86.

SENSOR TYPE TRANSMISSIVE

Select the Media Sensor

Select the media sensor that is appropriate for the media that you are using. The reflective sensor typically is used only for black mark media. The transmissive sensor typically is used for other media types.

See Sensor Type on page 86 for more information.

MEDIA/RIBBON CAL START

Calibrate the Media and Ribbon Sensors

Use this menu item to adjust the sensitivity of the media and ribbon sensors.

For instructions on how to perform a calibration procedure, see Calibrate the Ribbon and Media Sensors on page 119.

PRINT INFORMATION ▼ SENSOR PROFILE ▲ PRINT

Use this menu item to print a sensor profile.

See Print Information on page 71 or Sensor Profile on page 170 for more information.

* Other options are available by scrolling.

LABEL SENSOR ▼ 204 ▲ ↑

Set the Sensitivity of the Label Sensor

ZEBRA ZT420 - Set the Sensitivity of the Label Sensor - 1

Important • This value is set during sensor calibration. Do not change this setting unless you are told to do so by Zebra Technical Support or by an authorized service technician.

See Label Sensor on page 86 for more information.

TAKE LABEL ▼ 50 ▲ ↑

Set the Intensity of the Take Label LED

ZEBRA ZT420 - Set the Intensity of the Take Label LED - 1

Important • This value is set during sensor calibration. Do not change this setting unless you are told to do so by Zebra Technical Support or by an authorized service technician.

See Take Label on page 86 for more information.

PORTS MENU GO

Ports Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

BAUD RATE 9600

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - Ports Menu Shortcut - 2

flowchart
graph LR
    A["TAKE LABEL 000"] --> B["GO"]
    B --> C["SENSOR TYPE TRANSMISSIVE"]
    C --> A

ZEBRA ZT420 - Ports Menu Shortcut - 3

PORTS Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see Table 7, Port Settings on page 87.

BAUD RATE ▼ 9600 ▲ ↑

Set the Baud Rate

Select the baud value that matches the one being used by the host computer.

See Baud Rate on page 87 for more information.

DATA BITS ▼ 8 ▲ ↑

Set the Data Bits Value

Select the data bits value that matches the one being used by the host computer.

See Data Bits on page 87 for more information.

PARITY ▼ NONE ▲ ↑

Set the Parity Value

Select the parity value that matches the one being used by the host computer.

See Parity on page 87 for more information.

HOST HANDSHAKE ▼ XON/XOFF ▲

Set the Host Handshake Protocol Value

Select the handshake protocol that matches the one being used by the host computer.

See Host Handshake on page 88 for more information.

ZEBRA TECHNOLOGIES WML S1.09 © zebra.com/support

View the Wireless Markup Language (WML) Version

This value cannot be changed.

BLUETOOTH MENU ↑ GO

BlueTooth Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

GO M DARKNESS 10 START

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - BlueTooth Menu Shortcut - 2

flowchart
graph LR
    A["ZEBRA TECHNOLOGY WILM S109"] --> B["Central Device"]
    C["BAUD RATE 9500"] --> B
    B --> D["GO"]
    B --> E["↓"]
    B --> F["↑"]

ZEBRA ZT420 - BlueTooth Menu Shortcut - 3

BLUETOOTH Menu

Items in this menu are shown in the order in which they appear when you press the RIGHT ARROW. For more information about these settings, see BlueTooth Settings on page 89.

BLUETOOTH ADDRESS XX:XX:XX:XX:XX:XX

View the BlueTooth Address

Displays the printer's Bluetooth Device Address See MAC Address on page 78 for more information.

MODE SLAVE

View the Printer's BlueTooth Mode

Displays the Bluetooth connection pair printer's device type—Slave (typical) or Master.

See Baud Rate on page 87 for more information.

DISCOVERY ON

View the Printer's BlueTooth Mode

Select if the printer is “Discoverable” for Bluetooth device pairing. See Baud Rate on page 87 for more information.

CONNECTED NO

View the Printer's BlueTooth Mode

Displays the Bluetooth connection status to its paired device (Yes or No). See Baud Rate on page 87 for more information.

BT SPEC VERSION 2.1

View the Printer's BlueTooth Mode

Displays the Bluetooth operational specification level.

See Baud Rate on page 87 for more information.

MIN SECURITY MODE 1

View the Printer's BlueTooth Mode

Displays the printer's Bluetooth minimum level of applied security.

See Baud Rate on page 87 for more information.

SETTINGS MENU ↑ GO

Settings Menu Shortcut

- To be taken to the next user menu, press OK or press RIGHT SELECT to select GO.

GO → DARKNESS 10 START

- To continue to navigate in the same user menu, press the LEFT ARROW or RIGHT ARROW.

ZEBRA ZT420 - Settings Menu Shortcut - 2

flowchart
graph LR
    A["BLUETOOTH ADDRESS XX.XX.XX.XX.XX.XX"] --> B["GO"]
    B --> C["MIN SECURITY MODE 1"]

Calibrate the Ribbon and Media Sensors

Use the procedure in this section to calibrate the printer, which adjusts the sensitivity of the media and ribbon sensors.

  • For issues that may be resolved by sensor calibration, see Printing Issues on page 148.
  • For a summary of the options for initiating calibration, see Media and Ribbon Sensor Calibration on page 75.

ZEBRA ZT420 - Calibrate the Ribbon and Media Sensors - 1

Important • Follow the calibration procedure exactly as presented. All of the steps must be performed even if only one of the sensors requires adjustment. You may press and hold CANCEL at any step in this procedure to cancel the process.

To perform sensor calibration, complete these steps:

  1. With the printer in the Ready state, initiate media and ribbon calibration in one of these ways:

  2. Press and hold PAUSE + FEED + CANCEL for 2 seconds.

  3. Send the ezpl.manual_calibration SGD command to the printer. See the Zebra Programming Guide for more information about this command.
  4. Navigate to the following menu item on the control panel display. This item is located under the TOOLS menu and the SENSORS menu. See Navigating through Screens in the Display on page 90 for information about using the control panel and accessing the menus.

MEDIA/RIBBON CAL START

a. Press RIGHT SELECT to select START.

The printer does the following:

• The STATUS light and SUPPLIES light flash yellow once.
• T h e PAUSE light blinks yellow.
• The control panel displays:

MEDIA/RIBBON CAL LOAD BACKING REMOVE RIBBON

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 3

2.

Caution • The printhead may be hot and could cause severe burns. Allow the printhead to cool.

Open the printhead assembly by rotating the printhead-open lever.

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 4

natural_image Technical line drawing of a mechanical device with no visible text or symbols
  1. Extend the media approximately 8 in. (203 mm) out of the printer.

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 5

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Remove the exposed labels so that only the liner remains.

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 6

natural_image Technical line drawing of a mechanical assembly with directional arrows indicating motion (no text or symbols)
  1. Pull the media into the printer so that only the backing is between the media sensors.

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 7

natural_image Technical diagram of a robotic arm and mechanical device with directional arrows indicating motion (no text or symbols)
  1. Remove the ribbon (if used).

  2. Rotate the printhead-open lever (1) downward until it locks the printhead in place.

Technical diagram showing a blue mechanical component with directional arrows and numbered reference point '1'

  1. Press PAUSE to begin the media calibration process.

• T h e PAUSE light turns off.

• The SUPPLIES light flashes.

• The control panel displays:

MEDIA/RIBBON CAL CALIBRATING PLEASE WAIT

When the process is complete:

• The SUPPLIES light stops flashing.
• The PAUSE light flashes yellow.
• The control panel displays:

MEDIA/RIBBON CAL RELOAD ALL CONTINUE

  1. Open the printhead assembly by rotating the printhead-open lever.

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 11

natural_image Technical line drawing of a mechanical device with a blue component and directional arrow (no text or symbols)
  1. Pull the media forward until a label is positioned under the media sensors.

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 12

natural_image Technical line drawing of a mechanical assembly with a blue component and directional arrow (no text or symbols)
  1. Reload the ribbon (if used).
  2. Close the printhead.
  3. Close the media door.

ZEBRA ZT420 - To perform sensor calibration, complete these steps: - 13

natural_image Line drawing of a device with a curved arrow indicating rotation or movement (no text or symbols)
  1. Press PAUSE to enable printing.

Adjust the Printhead Pressure

You may need to adjust printhead pressure if printing is too light on one side, if you use thick media, or if the media drifts from side to side during printing. Use the lowest printhead pressure necessary to produce good print quality.

See Figure 3. The printhead pressure adjustment dials have setting marks from 1 to 4.

Figure 3 • Printhead Pressure Adjustment Dials
Technical diagram of a device with labeled components, showing two yellow cylindrical parts inserted into a rack.

1Inside dial
2Outside dial

See Table 10. Begin with the following pressure settings, based on your printer and media width, and make adjustments as necessary.

Table 10 • Pressure Setting Starting Points

Printer Media WidthInside Dial Setting Outside Dial Setting
ZT410 1 in. (25 mm) 4 1
2 in. (51 mm) 3 1
3 in. (76 mm) 2.5 1.5
≥3.5 in. (89 mm)2 2
ZT420 2 in. (51 mm) 4 1
3 in. (76 mm) 3.51
4 in. (102 mm)31.5
≥5 in. (127 mm)2 2

If necessary, adjust the printhead pressure adjustment dials as follows:

If the media... Then...
Requires higher pressure to print wellIncrease both dials one position. ZEBRA ZT420 - Adjust the Printhead Pressure - 2
Prints too lightly on the left side of the label.Increase the inside dial setting one position. ZEBRA ZT420 - Adjust the Printhead Pressure - 3
Prints too lightly on the right side of the label.Increase the outside dial setting one position. ZEBRA ZT420 - Adjust the Printhead Pressure - 4
Shifts left while printing Increase the outside dial setting one position.ZEBRA ZT420 - Adjust the Printhead Pressure - 5ORDecrease the inside dial setting one position.
ZEBRA ZT420 - Adjust the Printhead Pressure - 6
Shifts right while printing Increasethe inside dial setting one position.
ZEBRA ZT420 - Adjust the Printhead Pressure - 7ORDecrease the outside dial setting one position.
ZEBRA ZT420 - Adjust the Printhead Pressure - 8

Remove Used Ribbon

Remove used ribbon from the ribbon take-up spindle each time you change the roll of ribbon.

To remove used ribbon, complete these steps:

  1. Has the ribbon run out?
If the ribbon... Then
Ran out Continue with the next step.
Did not run out Cut or break the ribbon before the ribbon take-up spindle.
ZEBRA ZT420 - To remove used ribbon, complete these steps: - 1Caution • Do not cut the ribbon directly on the ribbon take-up spindle. Doing so may damage the spindle.
  1. While holding the ribbon take-up spindle, turn the ribbon release knob to the left until it stops.

The ribbon release bars pivot down, easing the spindle's grip on the used ribbon.

ZEBRA ZT420 - To remove used ribbon, complete these steps: - 2

natural_image Diagram of a mechanical component with a yellow circular component and directional arrow indicating rotation (no text or symbols)
  1. Slide the used ribbon off of the ribbon take-up spindle and discard.

ZEBRA ZT420 - To remove used ribbon, complete these steps: - 3

natural_image Mechanical assembly diagram showing a cylindrical component with internal yellow cavity and directional arrow (no text or symbols)

Routine Maintenance

This section provides routine cleaning and maintenance procedures.

Contents

Cleaning Schedule and Procedures.... 130

Clean the Exterior, the Media Compartment, and the Sensors 131

Clean the Printhead and Platen Roller. 132

Clean the Peel Assembly.... 136

Clean the Cutter Module 140

Replacing Printer Components 144

Ordering Replacement Parts 144

Recycling Printer Components 144

Lubrication 144

Cleaning Schedule and Procedures

Routine preventive maintenance is a crucial part of normal printer operation. By taking good care of your printer, you can minimize the potential problems that you might have with it and help to achieve and to maintain your standards for print quality.

Over time, the movement of media or ribbon across the printhead wears through the protective ceramic coating, exposing and eventually damaging the print elements (dots). To avoid abrasion:

  • Clean the printhead frequently.
  • Minimize printhead pressure and burn temperature (darkness) settings by optimizing the balance between the two.
  • When using Thermal Transfer mode, ensure that the ribbon is as wide or wider than the media to prevent exposing the printhead elements to the more abrasive label material.

ZEBRA ZT420 - Cleaning Schedule and Procedures - 1

Important • Zebra is not responsible for damage caused by the use of cleaning fluids on this printer.

Specific cleaning procedures are provided on the following pages. Table 1 shows the recommended cleaning schedule. These intervals are intended as guidelines only. You may have to clean more often, depending upon your application and media.

Table 1 • Recommended Cleaning Schedule

Area Method Interval
PrintheadSolvent*Direct Thermal Mode: After every roll of media (or 500 feet of fanfold media).Thermal Transfer Mode: After every roll of ribbon.
Platen roller Solvent*
Media sensors Air blow
Ribbon sensor Air blow
Media path Solvent*
Ribbon path Solvent*
Pinch roller (part of Peel-Off option)Solvent*
Cutter moduleIf cutting continuous, pressure-sensitive mediaSolvent* Afterevery roll of media (or more often, depending upon your application and media).
If cutting tag stock or label liner materialSolvent* and air blowAfter every two or three rolls of media.
Tear-off/peel-off barSolvent*Once a month.
Take-label sensorAir blow Onceevery six months.

* Zebra recommends using Preventive Maintenance Kit (part number 47362). In place of this kit, you may use a clean swab dipped in a solution of isopropyl alcohol (minimum 90%) and deionized water (maximum 10%).

Clean the Exterior, the Media Compartment, and the Sensors

Over time, dust, grime, and other debris may build up on the outside and inside of your printer, particularly in a harsh operating environment.

Printer Exterior

You may clean the exterior surfaces of the printer with a lint-free cloth and a small amount of a mild detergent, if necessary. Do not use harsh or abrasive cleaning agents or solvents.

ZEBRA ZT420 - Printer Exterior - 1

Important • Zebra is not responsible for damage caused by the use of cleaning fluids on this printer.

Media Compartment and Sensors

To clean the sensors, complete these steps:

  1. Brush, air blow, or vacuum any accumulated paper lint and dust away from the media and ribbon paths.

  2. Brush, air blow, or vacuum any accumulated paper lint and dust away from the sensors.

1 2 3

1Take-label sensor
2Ribbon sensor reflector
3Media sensor

Clean the Printhead and Platen Roller

Inconsistent print quality, such as voids in the bar code or graphics, may indicate a dirty printhead. For the recommended cleaning schedule, see Table 1 on page 130.

Caution • While performing any tasks near an open printhead, remove all rings, watches, hanging necklaces, identification badges, or other metallic objects that could touch the printhead. You are not required to turn off the printer power when working near an open printhead, but Zebra recommends it as a precaution. If you turn off the power, you will lose all temporary settings, such as label formats, and you must reload them before you resume printing.

ZEBRA ZT420 - Clean the Printhead and Platen Roller - 1

Note • For printers with a peel assembly, keep the peel assembly closed while cleaning the platen roller to reduce the risk of bending the tear-off/peel-off bar.

ZEBRA ZT420 - Clean the Printhead and Platen Roller - 2

Caution • The printhead may be hot and could cause severe burns. Allow the printhead to cool.

ZEBRA ZT420 - Clean the Printhead and Platen Roller - 3

Caution • Before touching the printhead assembly, discharge any built-up static electricity by touching the metal printer frame or by using an antistatic wriststrap and mat.

To clean the printhead and platen roller, complete these steps:

  1. Raise the media door.

ZEBRA ZT420 - To clean the printhead and platen roller, complete these steps: - 1

natural_image Line drawing of a mechanical device with a curved arrow indicating rotation or motion (no text or symbols)

ZEBRA ZT420 - To clean the printhead and platen roller, complete these steps: - 2

2.

Caution • The printhead may be hot and could cause severe burns. Allow the printhead to cool.

Open the printhead assembly by rotating the printhead-open lever.

ZEBRA ZT420 - To clean the printhead and platen roller, complete these steps: - 3

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Remove the ribbon (if used) and the media.

  2. Using the swab from a Zebra Preventive Maintenance Kit, wipe along the brown strip on the printhead assembly from end to end. In place of the Preventive Maintenance Kit, you may use a clean swab dipped in a solution of isopropyl alcohol (minimum 90%) and deionized water (maximum 10%). Allow the solvent to evaporate.

ZEBRA ZT420 - To clean the printhead and platen roller, complete these steps: - 4

natural_image Illustration of a hand using a screwdriver to adjust or install a blue mechanical component on an electronic device (no text or symbols visible)
  1. While manually rotating the platen roller, clean it thoroughly with the swab. Allow the solvent to evaporate.

ZEBRA ZT420 - To clean the printhead and platen roller, complete these steps: - 5

natural_image Illustration of hands using a screwdriver to adjust or install a component inside a machine (no text or symbols visible)
  1. Reload the ribbon (if used) and the media. For instructions, see Load the Ribbon on page 60 or Load the Media on page 34.

  2. Rotate the printhead-open lever (1) downward until it locks the printhead in place.

Technical diagram showing a mechanical assembly with labeled components and directional arrows indicating movement or assembly.

  1. Close the media door.

ZEBRA ZT420 - To clean the printhead and platen roller, complete these steps: - 7

natural_image Line drawing of a device with a curved arrow indicating rotation or movement (no text or symbols)

The printer is ready to operate.

  1. Press PAUSE to exit pause mode and enable printing.

The printer may perform a label calibration or feed a label, depending on your settings.

ZEBRA ZT420 - To clean the printhead and platen roller, complete these steps: - 8

Note • If performing this procedure does not improve print quality, try cleaning the printhead with Save-A-Printhead cleaning film. This specially coated material removes contamination buildup without damaging the printhead. Call your authorized Zebra reseller for more information.

Clean the Peel Assembly

The peel assembly, which is part of the Peel-Off and Liner Take-Up options, consists of several spring-loaded rollers to ensure the proper roller pressure. Clean the pinch roller and tear-off/peel-off bar if adhesive buildup begins to affect peel performance.

ZEBRA ZT420 - Clean the Peel Assembly - 1

Caution • Do not use your left hand to assist in closing the Peel assembly. The top edge of the Peel roller/assembly could pinch your fingers.

If adhesive buildup affects peel-off performance, complete these steps:

  1. Raise the media door.

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 1

natural_image Line drawing of a mechanical device with internal components and a curved arrow indicating rotation (no text or symbols)

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 2

  1. Caution • The printhead may be hot and could cause severe burns. Allow the printhead to cool.

Open the printhead assembly by rotating the printhead-open lever.

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 3

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Push down the peel-off mechanism release lever to open the peel assembly.

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 4

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. Remove any media liner to expose the pinch roller.

  2. While manually rotating the pinch roller, clean it thoroughly with the swab from the Preventive Maintenance Kit (part number 47362). In place of the Preventive Maintenance Kit, you may use a clean swab dipped in a solution of isopropyl alcohol (minimum 90%) and deionized water (maximum 10%). Allow the solvent to evaporate.

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 5

natural_image Illustration of hands installing a component into a device (no text or symbols visible)
  1. Use the swab to remove excess adhesive from the tear-off/peel-off bar. Allow the solvent to evaporate.

Important • Apply minimum force when cleaning the tear-off/peel-off bar. Excessive force can cause the tear-off/peel-off bar to bend, which could have a negative effect on peel performance.

  1. Reload the media liner through the peel mechanism. For instructions, see Final Steps for Peel-Off Mode (with or without Liner Take-Up) on page 42.

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 6

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 7

8.

Caution • Use the peel release lever and your right hand to close the peel assembly. Do not use your left hand to assist in closing. The top edge of the peel roller/assembly could pinch your fingers.

Close the peel assembly using the peel-off mechanism release lever.

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 8

natural_image Technical line drawing of a mechanical assembly with a belt switch (no text or symbols)
  1. Rotate the printhead-open lever (1) downward until it locks the printhead in place.

Technical diagram showing a blue mechanical component with directional arrows indicating assembly or movement, labeled with number 1.

  1. Close the media door.

ZEBRA ZT420 - If adhesive buildup affects peel-off performance, complete these steps: - 10

natural_image Line drawing of a device casing with internal components and an arrow indicating rotation (no text or symbols)

The printer is ready to operate.

  1. Press PAUSE to exit pause mode and enable printing.

The printer may perform a label calibration or feed a label, depending on your settings.

Clean the Cutter Module

If the cutter is not cutting the labels cleanly or if it jams with labels, clean the cutter.

ZEBRA ZT420 - Clean the Cutter Module - 1

Caution • For personnel safety, always power off and unplug the printer before performing this procedure.

To clean the cutter module, complete these steps:

  1. Turn the printer off (O), and unplug the printer from its power source.

  2. Raise the media door.

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 1

natural_image Line drawing of a mechanical device with a curved arrow indicating rotation or motion (no text or symbols)
  1. Remove media that is loaded through the cutter module.

  2. Loosen and remove the thumbscrew and lock washer on the cutter shield.

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 2

natural_image Line drawing of a mechanical device with a cylindrical component inserted, showing internal blades and a curved arrow indicating rotation (no text or symbols)

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 3

5.

Caution • The cutter blade is sharp. Do not touch or rub the blade with your fingers.

Remove the cutter shield.

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 4

natural_image Technical illustration of a door handle assembly with an arrow indicating upward motion (no text or symbols present)
  1. If necessary, rotate the cutter motor thumbscrew to fully expose the V-shaped cutter blade (1).

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 5

natural_image Technical line drawing of a mechanical device with labeled component '1' and rotation arrow (no text or symbols beyond label)
  1. Using the swab from the Preventive Maintenance Kit (part number 47362), wipe along the upper cutting surface (1) and the cutter blade (2). In place of the Preventive Maintenance Kit, you may use a clean swab dipped in a solution of isopropyl alcohol (minimum 90%) and deionized water (maximum 10%). Allow the solvent to evaporate.

Diagram showing a hand using a device to press or install a tray, labeled with arrows indicating process steps.

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 7

  1. Caution • The cutter blade is sharp. For operator safety, replace the cutter shield.

Replace the cutter shield (1) and secure it with the thumbscrew and lock washer that you removed earlier (2).

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 8

natural_image Diagram of a refrigerator with a handle and lid, showing internal compartments and ventilation slots (no text or symbols)

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 9

natural_image Line drawing of a mechanical device with a button and arrow indicating rotation (no text or symbols)
  1. Close the media door.

ZEBRA ZT420 - To clean the cutter module, complete these steps: - 10

natural_image Line drawing of a mechanical device with an arrow indicating rotation or movement (no text or symbols present)
  1. Plug the printer into its power source, and then turn on (I) the printer. The cutter blade returns to its operating position.

  2. If the cutter continues to perform unsatisfactorily, contact an authorized service technician.

Replacing Printer Components

Some printer components, such as the printhead and platen roller, may wear out over time and can be replaced easily. Regular cleaning may extend the life of some of these components. See Table 1 on page 130 for the recommended cleaning intervals.

Ordering Replacement Parts

For optimal printing quality and proper printer performance across our product line, Zebra strongly recommends the use of genuine Zebra ^TM supplies as part of the total solution. Specifically, the ZT400 Series printers are designed to work only with genuine Zebra ^TM printheads, thus maximizing safety and print quality.

Contact your authorized Zebra reseller for part ordering information.

Recycling Printer Components

ZEBRA ZT420 - Recycling Printer Components - 1

The majority of this printer's components are recyclable. The printer's main logic board may include a battery that you should dispose of properly.

Do not dispose of any printer components in unsorted municipal waste. Please dispose of the battery according to your local regulations, and recycle the other printer components according to your local standards. For more information, see http://www.zebra.com/environment.

Lubrication

No lubrication is needed for this printer.

Caution • Some commercially available lubricants will damage the finish and the mechanical parts if used on this printer.

Troubleshooting

This section provides information about errors that you might need to troubleshoot. Assorted diagnostic tests are included.

Contents

Meaning of Indicator Lights 146

Printing Issues 148

Ribbon Problems 151

RFID Problems.... 152

Error Messages 155

Communications Problems 159

Miscellaneous Issues.... 160

Printer Diagnostics....162

Power-On Self Test 162

CANCEL Self Test 163

PAUSE Self Test 164

FEED Self Test. 165

FEED + PAUSE Self Test. 168

CANCEL + PAUSE Self Test 168

Communication Diagnostics Test. 169

Sensor Profile 170

Meaning of Indicator Lights

The indicator lights on the control panel show the current status of the printer (Table 1).

Table 1 • Status of Printer As Shown by Indicator Lights

[6TB0][16T7B][XXIX][XVX5][6C24]STATUS light steady green (other lights steady yellow for 2 seconds during printer power-up)The printer is ready.
STATUSPAUSEDATASUPPLIESNETWORK
ZEBRA ZT420 - Meaning of Indicator Lights - 1[8VWK][9GCK][277S]ZEBRA ZT420 - Meaning of Indicator Lights - 2PAUSE light steady yellow.The printer is paused.
STATUSPAUSEDATASUPPLIESNETWORK
ZEBRA ZT420 - Meaning of Indicator Lights - 3[0A02][0HAT][XYZI][0W70]STATUS light steady redSUPPLIES light steady redThe media supply is out. The printer needs attention and cannot continue without user intervention.
STATUSPAUSEDATASUPPLIESNETWORK
[4WD3][133X][1443][84AA][TNETW]STATUS light steady redSUPPLIES light flashing redThe ribbon supply is out. The printer needs attention and cannot continue without user intervention.
STATUSPAUSEDATASUPPLIESNETWORK
[1CBC][6V87][7TBH][102ZH][26CB]STATUS light steady yellowSUPPLIES light flashing yellowThe printer is in Direct Thermal mode, which does not require ribbon; however, ribbon is installed in the printer.
STATUSPAUSEDATASUPPLIESNETWORK
ZEBRA ZT420 - Meaning of Indicator Lights - 4[5HCY][1038][54WW]ZEBRA ZT420 - Meaning of Indicator Lights - 5STATUS light steady redPAUSE light steady yellowThe printhead is open. The printer needs attention and cannot continue without user intervention.
STATUSPAUSEDATASUPPLIESNETWORK
[183C][122Z][14CCB]ZEBRA ZT420 - Meaning of Indicator Lights - 6[12ZX3]STATUS light steady yellowThe printhead is over temperature.Caution • The printhead may be hot and could cause severe burns. Allow the printhead to cool.
STATUSPAUSEDATASUPPLIESNETWORK
ZEBRA ZT420 - Meaning of Indicator Lights - 7[22XW][21WA][84ZW][8-C26]STATUS light flashing yellowThis indicator light flashing indicates one of the following:• The printhead is under temperature.• The power supply is over temperature.• The main logic board (MLB) is over temperature.
STATUSPAUSEDATASUPPLIESNETWORK
[0HAH]ZEBRA ZT420 - Meaning of Indicator Lights - 8[2H27][707Y]ZEBRA ZT420 - Meaning of Indicator Lights - 9STATUS light steady redPAUSE light steady redDATA light steady redThe printhead was replaced with one that is not a genuine ZebraTM printhead. Install a genuine ZebraTM printhead to continue.
S' ZEBRA ZT420 - Meaning of Indicator Lights - 10ZEBRA ZT420 - Meaning of Indicator Lights - 11ZEBRA ZT420 - Meaning of Indicator Lights - 12[A26W]ZEBRA ZT420 - Meaning of Indicator Lights - 13
ZEBRA ZT420 - Meaning of Indicator Lights - 14STATUS[2354]PAUSE[TOTO]DATAZEBRA ZT420 - Meaning of Indicator Lights - 15SUPPLIES[XOTA]NETWORKSTATUS light flashing redThe printer is unable to read the dpi setting of the printhead.
Printers with a ZebraNet wired Ethernet option
NETWORK light offNo Ethernet link is available.
STATUSPAUSEDATASUPPLIESNETWORK
NETWORK light steady greenA 100 Base link was found.
STATUSPAUSEDATASUPPLIESNETWORK
NETWORK light steady yellowA 10 Base link was found.
STATUSPAUSEDATASUPPLIESNETWORKNETWORK light steady redAn Ethernet error condition exists. The printer is not connected to your network.
Printers with a ZebraNet wireless option
NETWORK light offA radio was found during power-up. The printer is attempting to associate with the network. The light flashes red while the printer associates with the network. The light then flashes yellow while the printer is authenticating with the network.
STATUSPAUSEDATASUPPLIESNETWORK
STATUSPAUSEDATASUPPLIESNETWORK
STATUSPAUSEDATASUPPLIESNETWORK
STATUSPAUSEDATASUPPLIESNETWORKNETWORK light steady greenThe radio is associated with your network and authenticated, and the WLAN signal is strong.
STATUSPAUSEDATASUPPLIESNETWORKNETWORK light flashing greenWLAN—The radio is associated with your network and authenticated, but the WLAN signal is weak.
STATUSPAUSEDATASUPPLIESNETWORKNETWORK light steady redA WLAN error condition exists. The printer is not connected to your network.

Printing Issues

Table 2 identifies possible issues with printing or print quality, the possible causes, and the recommended solutions.
Table 2 • Printing Issues

Issue Possible CauseRecommended Solution
General print quality issuesThe printer is set at the incorrect print speed.For optimal print quality, set the print speed to the lowest possible setting for your application via control panel, the driver, or the software. You may want to perform the FEED Self Test on page 165 to determine the optimal settings for your printer.See Print Speed on page 67 for how to change the print speed.
You are using an incorrect combination of labels and ribbon for your application.1. Switch to a different type of media or ribbon to try to find a compatible combination.2. If necessary, consult your authorized Zebra reseller or distributor for information and advice.
The printer is set at an incorrect darkness level.For optimal print quality, set the darkness to the lowest possible setting for your application. You may want to perform the FEED Self Test on page 165 to determine the ideal darkness setting.See Print Darkness on page 67 for how to change the darkness setting.
The printhead is dirty.Clean the printhead and platen roller. See Clean the Printhead and Platen Roller on page 132.
Incorrect or uneven printhead pressure.Set the printhead pressure to the minimum needed for good print quality. See Adjust the Printhead Pressure on page 124.
Loss of printing registration on labels. Excessive vertical drift in top-of-form registration.The platen roller is dirty. Clean the printhead and platen roller. See Clean the Printhead and Platen Roller on page 132.
Media guides are positioned improperly.Ensure that the media guides are properly positioned. See Load the Media on page 34.
The media type is set incorrectly.Set the printer for the correct media type (gap/notch, continuous, or mark). See Media Type on page 67.
The media is loaded incorrectly.Load media correctly. See Load the Media on page 34.
Long tracks of missing print on several labelsPrint clement damaged.Call a service technician.
Wrinkled ribbon. See wrinkled ribbon causes and solutions in Ribbon Problems on page 151.
Fine, angular gray lines on blank labelsWrinkled ribbon. See wrinkled ribbon causes and solutions in Ribbon Problems on page 151.
Printing too light or too dark over the entire labelThe media or ribbon is not designed for high-speed operation.Replace supplies with those recommended for high-speed operation.
You are using an incorrect combination of media and ribbon for your application.1. Switch to a different type of media or ribbon to try to find a compatible combination.2. If necessary, consult your authorized Zebra reseller or distributor for information and advice.
You are using ribbon with direct thermal media.Direct thermal media does not require ribbon. To determine if you are using direct thermal media, perform the label scratch test in When to Use Ribbon on page 18.
Incorrect or uneven printhead pressure.Set the printhead pressure to the minimum needed for good print quality. See Adjust the Printhead Pressure on page 124.
Smudge marks on labelsThe media or ribbon is not designed for high-speed operation.Replace supplies with those recommended for high-speed operation.
Misregistration/skips labelsThe printer is not calibrated. Calibrate the printer. See Calibrate the Ribbon and Media Sensors on page 119.
Improper label format. Check your label format and correct it as necessary.
Misregistration and misprint of one to three labelsThe platen roller is dirty. Clean the printhead and platen roller. See Clean the Printhead and Platen Roller on page 132.
Media does not meet specifications.Use media that meets specifications. See Media Specifications on page 176.
Vertical drift in top-of-form positionThe printer is out of calibration. Calibrate the printer. See Calibrate the Ribbon and Media Sensors on page 119.
The platen roller is dirty. Clean the printhead and platen roller. See Clean the Printhead and Platen Roller on page 132.
Vertical image or label driftThe printer is using non-continuous labels but is configured in continuous mode.Set the printer for the correct media type (gap/notch, continuous, or mark—see Media Type on page 67) and calibrate the printer, if necessary (see Calibrate the Ribbon and Media Sensors on page 119).
The media sensor is calibrated improperly.Calibrate the printer. See Calibrate the Ribbon and Media Sensors on page 119.
The platen roller is dirty. Clean thethe printhead and platen roller. See Clean the Printhead and Platen Roller on page 132.
Improper printhead pressure settings (toggles).Adjust the printhead pressure to ensure proper functionality. See Adjust the Printhead Pressure on page 124.
The media or ribbon is loaded incorrectly.Ensure that the media and ribbon are loaded correctly. See Load the Ribbon on page 60 and Load the Media on page 34.
Incompatible media. You must usemedia that meets the printer specifications. Ensure that the interlabel gaps or notches are 2 to 4 mm and consistently placed (see Media Specifications on page 176).
The bar code printed on a label does not scan.The bar code is not within specifications because the print is too light or too dark.Perform the FEED Self Test on page 165. Adjust the darkness or print speed settings as necessary.
There is not enough blank space around the bar code.Leave at least 1/8 in. (3.2 mm) between the bar code and other printed areas on the label and between the bar code and the edge of the label.
Auto Calibrate failed.The media or ribbon is loaded incorrectly.Ensure that the media and ribbon are loaded correctly. See Load the Ribbon on page 60 and Load the Media on page 34.
The sensors could not detect the media or ribbon.Calibrate the printer. See Calibrate the Ribbon and Media Sensors on page 119.
The sensors are dirty or positioned improperly.Ensure that the sensors are clean and properly positioned.
The media type is set incorrectly.Set the printer for the correct media type (gap/notch, continuous, or mark). See Media Type on page 67.

Ribbon Problems

Table 3 identifies problems that may occur with ribbon, the possible causes, and the recommended solutions.
Table 3 • Ribbon Problems

Problem Possible CauseRecommended Solution
Broken or melted ribbonDarkness setting too high.1. Reduce the darkness setting. See Print Darkness on page 67 for how to change the darkness setting.2. Clean the printhead thoroughly. See Clean the Printhead and Platen Roller on page 132.
The ribbon is coated on the wrong side and cannot be used in this printer.Replace the ribbon with one coated on the correct side. For more information, see Coated Side of Ribbon on page 18.
Wrinkled ribbonRibbon was loaded incorrectly.Load the ribbon correctly. See Load the Ribbon on page 60.
Incorrect burn temperature. For optimal print quality, set the darkness to the lowest possible setting for your application. You may want to perform the FEED Self Test on page 165 to determine the ideal darkness setting.See Print Darkness on page 67 for how to change the darkness setting.
Incorrect or uneven printhead pressure.Set the printhead pressure to the minimum needed for good print quality. See Adjust the Printhead Pressure on page 124.
Media not feeding properly; “walking” from side to side.Make sure that media is snug by adjusting the media guide, or call a service technician.
The printhead or platen roller may be installed incorrectly.Call a service technician.
The printer does not detect when the ribbon runs out.The printer may have been calibrated without ribbon. Later, ribbon was inserted without the user recalibrating the printer or loading printer defaults.Calibrate the printer, this time using ribbon, or load printer defaults. See Calibrate the Ribbon and Media Sensors on page 119 or Load Defaults on page 74.
In thermal transfer mode, the printer did not detect the ribbon even though it is loaded correctly.
The printer indicates that ribbon is out, even though ribbon is loaded correctly.The printer was not calibrated for the label and ribbon being used.Calibrate the printer. See Calibrate the Ribbon and Media Sensors on page 119.

RFID Problems

Table 4 identifies problems that may occur with RFID printers, the possible causes, and the recommended solutions. For more information about RFID, refer to the RFID Programming Guide 3. A copy of the manual is available at http://www.zebra.com/manuals or on the user CD that came with your printer.

Table 4 • RFID Problems

Problem Possible CauseRecommended Solution
The RFID-enabled printer voids every label.The printer is not calibrated for the media being used.Manually calibrate the printer (see Calibrate the Ribbon and Media Sensors on page 119).
You are using an RFID label with a tag type that is not supported by your printer.The ZT400 series printers support only Gen 2 RFID labels. For more information, refer to the RFID Programming Guide 3, or contact an authorized Zebra RFID reseller.
The printer is unable to communicate with the RFID reader.1. Turn off (O) the printer.2. Wait 10 seconds.3. Turn on (I) the printer.4. If the problem persists, you may have a bad RFID reader or a loose connection between the RFID reader and the printer. Contact Technical Support or an authorized Zebra RFID service technician for assistance.
Radio frequency (RF) interference from another RF source.Do one or more of the following as necessary:Move the printer away from fixed RFID readers or other RF sources.Make sure that the media door is closed at all times during RFID programming.
The settings are incorrect in your label designer software.The software settings override the printer settings. Make sure that the software and printer settings match.
You are using an incorrect programming position, particularly if the tags being used are within printer specifications.Do one or more of the following as necessary:Check the RFID programming position , or the program position setting in your label designer software. If the position is incorrect, change the setting.Restore the RFID programming position back to the default value.For more information, refer to the RFID Programming Guide 3. For transponder placement details, go to http://www.zebra.com/transponders.
You are sending RFID ZPL or SGD commands that are incorrect.Check your label formats. For more information, refer to the RFID Programming Guide 3.
Low yields. Too many RFID tags per roll are voided.The RFID labels are not within specifications for the printer, which means that the transponder is not in an area that can be programmed consistently.Make sure that the labels meet transponder placement specifications for your printer. See http://www.zebra.com/transponders for transponder placement information.For more information, refer to theRFID Programming Guide 3, or contact an authorized Zebra RFID reseller.
Incorrect read and write power levels for the RFID tag type.Change the RFID read and write power levels. For instructions, refer to theRFID Programming Guide 3.
Radio frequency (RF) interference from another RF source.Do one or more of the following as necessary:Move the printer away from fixed RFID readers.Make sure that the media door is closed at all times during RFID programming.
The printer is using outdated printer firmware and reader firmware versions.Go tohttp://www.zebra.com/firmware for updated firmware.
The printer stops at the RFID inlay.The printer calibrated the label length only to the RFID inlay instead of to the interlabel gap.1. Select FEED for theMEDIA POWER UP and HEAD CLOSE parameters (seePower-Up Action on page 72 orHead-Close Action on page 73).2. Manually calibrate the printer (seeCalibrate the Ribbon and Media Sensors on page 119).
The DATA light flashes indefinitely after you attempt to download printer or reader firmware.The download was not successful. For best results, cycle power on the printer before downloading any firmware.1. Turn off (O) the printer.2. Wait 10 seconds.3. Turn on (I) the printer.4. Attempt to download the firmware again.5. If the problem persists, contact Technical Support.
RFID parameters do not appear in Setup mode, and RFID information does not appear on the printer configuration label.The printer does not void RFID labels that are not programmed correctly.The printer was powered off (O) and then back on (I) too quickly for the RFID reader to initialize properly.Wait at least 10 seconds after turning the printer power off before turning it back on.Turn off (O) the printer.Wait 10 seconds.Turn on (I) the printer.Check for the RFID parameters in Setup mode or for RFID information on a new configuration label.
An incorrect version of printer or reader firmware was loaded on the printer.Verify that the correct firmware version is loaded on your printer. For more information, refer to the RFID Programming Guide 3.Download the correct printer or reader firmware if necessary.If the problem persists, contact Technical Support.
The printer is unable to communicate with the RFID subsystem.Turn off (O) the printer.Wait 10 seconds.Turn on (I) the printer.If the problem persists, you may have a bad RFID reader or a loose connection between the RFID reader and the printer. Contact Technical Support or an authorized service technician for assistance.

Error Messages

The control panel displays messages when there is an error. See Table 5 for errors, the possible causes, and the recommended solutions.

QuickHelp Pages Most error messages will include the option to view a QuickHelp page.

The lower right-hand corner of the message displays "QR."

To access a QuickHelp page from an error message, do the following:

  1. Press RIGHT SELECT to select QR.

The printer displays a QuickHelp page specific to that error message. This page includes a QR code.

  1. Scan the QR code with a smartphone.

Your phone accesses either a video specific to that error message or the Zebra support page for your printer.

Table 5 • Error Messages

Display/Indicator LightsPossible Cause RecommendedSolution
HEAD OPENCLOSE HEADSTATUS light steady redPAUSE light steady yellowThe printhead is not fully closed.Close the printhead completely.
The printhead open sensor is not working properly.Call a service technician to replace the sensor.
MEDIA OUTLOAD MEDIASTATUS light steady redSUPPLIES light steady redThe media is not loaded or is loaded incorrectly.Load media correctly. See Load the Media on page 34.
Misaligned media sensor. Checkthe position of the media sensor.
The printer is set for noncontinuous media, but continuous media is loaded.1. Install the proper media type, or reset printer for the current media type.2. Calibrate the printer. See Media and Ribbon Sensor Calibration on page 75.
WARNING RIBBON INSTATUS light steady yellowSUPPLIES light flashing yellowRibbon is loaded, but the printer is set for direct thermal mode.Ribbon is not required with direct thermal media. If you are using direct thermal media, remove the ribbon. This error message will not affect printing.
If you are using thermal transfer media, which requires ribbon, set the printer for Thermal Transfer mode. See Print Method on page 68.
ALERT RIBBON OUTSTATUS light steady yellowSUPPLIES light flashing yellowIn thermal transfer mode:• ribbon is not loaded• ribbon is loaded incorrectly• the ribbon sensor is not detecting ribbon• media is blocking the ribbon sensor1. Load ribbon correctly. SeeLoad the Ribbonon page 60.2. Calibrate the printer. SeeMedia and Ribbon Sensor Calibration on page 75.
In thermal transfer mode, the printer did not detect the ribbon even though it is loaded correctly.1. Print a sensor profile (seePrint Informationon page 71). The ribbon out threshold (2) is likely too high, above the line that indicates where the ribbon is detected (1).ZEBRA ZT420 - To access a QuickHelp page from an error message, do the following: - 12. Calibrate the printer (seeMedia and Ribbon Sensor Calibration on page 75) or load printer defaults (seeLoad Defaults on page 74).
If you are using direct thermal media, the printer is waiting for ribbon to be loaded because it is incorrectly set for thermal transfer mode.Set the printer for Direct Thermal mode. SeePrint Method on page 68.
PH NOT AUTHENTICATED REPLACE PRINTHEADSTATUS light steady redPAUSE light steady redDATA light steady redThe printhead was replaced with one that is not a genuine ZebraTM printhead.Install a genuine ZebraTM printhead.
PRINT HEAD OVERTEMP PRINTING HALTEDSTATUS light steady yellowZEBRA ZT420 - To access a QuickHelp page from an error message, do the following: - 2Caution • The printhead may be hot enough to cause severe burns. Allow the printhead to cool.
The printhead is over temperature.Allow the printer to cool.Printing automatically resumes when the printhead elements cool to an acceptable operating temperature.If this error persists, consider changing where the printer is located or using a slower print speed.
HEAD COLD PRINTING HALTEDTHERMISTOR REPLACE PRINTHEADSTATUS light steady yellowThe printer shows one of these messages or cycles between them.ZEBRA ZT420 - To access a QuickHelp page from an error message, do the following: - 3Caution • An improperly connected printhead data or power cable can cause these error messages. The printhead may be hot enough to cause severe burns.Allow the printhead to cool.
The printhead data cable is not properly connected.Call a service technician to hook up the printhead properly.
The printhead has a faulty thermistor.Call a service technician to replace the printhead.
HEAD COLD PRINTING HALTEDSTATUS light flashing yellowZEBRA ZT420 - To access a QuickHelp page from an error message, do the following: - 4Caution • An improperly connected printhead data or power cable can cause this error message. The printhead may be hot enough to cause severe burns.Allow the printhead to cool.
The printhead temperature is approaching its lower operating limit.Continue printing while the printhead reaches the correct operating temperature. If the error remains, the environment may be too cold for proper printing. Relocate the printer to a warmer area.
The printhead data cable is not properly connected.Call a service technician to hook up the printhead properly.
The printhead has a faulty thermistor.Call a service technician to replace the printhead.
CUT ERRORSTATUS light steady redPAUSE light steady yellowCaution • The cutter blade is sharp. Do not touch or rub the blade with your fingers.
The cutter blade is in the media path.Turn off the printer power and unplug the printer. Inspect the cutter module for debris and clean as needed following the cleaning instructions inClean the Cutter Module on page 140.
OUT OF MEMORY STORING GRAPHICThere is not enough memory to perform the function specified on the second line of the error message.Free up some of the printer's memory by adjusting the label format or printer parameters. One way to free up memory is to adjust the print width to the actual width of the label instead of leaving the print width set to the default. SeePrint Width on page 69.
OUT OF MEMORY STORING FORMAT
OUT OF MEMORY STORING BITMAPEnsure that the data is not directed to a device that is not installed or is unavailable.
OUT OF MEMORY STORING FONTIf the problem persists, call a service technician.

Communications Problems

Table 6 identifies problems with communications, the possible causes, and the recommended solutions.

Table 6 • Communications Problems

Problem Possible Cause Recommended Solution
A label format was sent to the printer but was not recognized. The DATA light does not flash.The communication parameters are incorrect.Check the printer driver or software communications settings (if applicable).
If you are using serial communication, check the serial port settings. SeePORTS Menu on page 115.
If you are using serial communication, make sure that you are using a null modem cable or a null modem adapter.
Check the printer's handshake protocol setting. The setting used must match the one being used by the host computer. SeeHost Handshake on page 88.
If a driver is used, check the driver communication settings for your connection.
A label format was sent to the printer. Several labels print, then the printer skips, misplaces, misses, or distorts the image on the label.The serial communication settings are incorrect.Ensure that the flow control settings match.
Check the communication cable length. SeeTable 2 on page 25 for requirements.
Check the printer driver or software communications settings (if applicable).
A label format was sent to the printer but was not recognized. The DATA light flashes but no printing occurs.The prefix and delimiter characters set in the printer do not match the ones in the label format.Verify the prefix and delimiter characters. SeeCommand Character on page 84 andDelimiter Character on page 84.
Incorrect data is being sent to the printer.Check the communication settings on the computer. Ensure that they match the printer settings.
If the problem continues, check the label format.

Miscellaneous Issues

Table 7 identifies miscellaneous issues with the printer, the possible causes, and the recommended solutions.
Table 7 • Miscellaneous Printer Problems

Problem Possible Cause Recommended Solution
The control panel display shows a language that I cannot readThe language parameter was changed through the control panel or a firmware command.1. On the control panel display, scroll to LANGUAGE Menu. ZEBRA ZT420 - Miscellaneous Issues - 12. Press OK to access the items in this menu.3. Use the UP ARROW or DOWN ARROW to scroll through the language selections. The selections for this parameter are displayed in the actual languages to make it easier for you to find one that you are able to read.4. Select the language that you want to display.
The display is missing characters or parts of charactersThe display may need replacing.Call a service technician.
Changes in parameter settings did not take effectSome parameters are set incorrectly.1. Check the parameters and change or reset if necessary.2. Turn the printer off (O) and then on (I).
A firmware command turned off the ability to change the parameter.Refer to the Programming Guide for ZPL, ZBI, Set-Get-Do, Mirror, and WML or call a service technician.
A firmware command changed the parameter back to the previous setting.
If the problem persists, there may be a problem with the main logic board.Call a service technician.
Non-continuous labels are being treated as continuous labels.The printer was not calibrated for the media being used.Calibrate the printer. See Calibrate the Ribbon and Media Sensors on page 119.
The printer is configured for continuous media.Set the printer for the correct media type (gap/notch, continuous, or mark). See Media Type on page 67.
All indicator lights are on, nothing is on the display (if the printer has a display), and the printer locks up.Internal electronic or firmware failure.Call a service technician.
The printer locks up while running the Power-On Self Test.Main logic board failure. Call a service technician.
Problem Possible CauseRecommended Solution
The printer is not acknowledging a USB device or is not reading the files on a USB device that is plugged into the USB host port.The printer currently supports USB drives only up to 1 TB in size.Use a USB drive that is 1 TB or smaller.
The USB drive may require its own external power.If your USB drive requires external power, make sure that it is plugged into a working power supply.

Printer Diagnostics

Self tests and other diagnostics provide specific information about the condition of the printer. The self tests produce sample printouts and provide specific information that helps determine the operating conditions for the printer.

ZEBRA ZT420 - Printer Diagnostics - 1

Important • Use full-width media when performing self tests. If your media is not wide enough, the test labels may print on the platen roller. To prevent this from happening, check the print width, and ensure that the width is correct for the media that you are using.

Each self test is enabled by pressing a specific control panel key or combination of keys while turning on (I) the printer power. Keep the key(s) pressed until the first indicator light turns off. The selected self test automatically starts at the end of the Power-On Self Test.

ZEBRA ZT420 - Printer Diagnostics - 2

Note •

  • When performing these self tests, do not send data to the printer from the host.
  • If your media is shorter than the label to be printed, the test label continues on the next label.
  • When canceling a self test prior to its actual completion, always reset the printer by turning it off (O) and then on (I).

Power-On Self Test

A Power-On Self Test (POST) is performed each time the printer is turned on (I). During this test, the control panel lights (LEDs) turn on and off to ensure proper operation. At the end of this self test, only the STATUS LED remains lit. When the Power-On Self Test is complete, the media is advanced to the proper position.

To initiate the Power-On Self Test, complete these steps:

1. Turn on (I) the printer.

The POWER LED illuminates. The other control panel LEDs and the LCD monitor the progress and indicate the results of the individual tests. All messages during the POST display in English; however, if the test fails, the resulting messages cycle through the international languages as well.

CANCEL Self Test

The CANCEL self test prints a printer configuration label and a network configuration label. For other ways to print these labels, see Print Information on page 71.

To perform the CANCEL Self Test, complete these steps:

  1. Turn off (O) the printer.

  2. Press and hold CANCEL while turning on (I) the printer. Hold CANCEL until the first control panel light turns off.

The printer prints a printer configuration label (Figure 1) and then a network configuration label (Figure 2).

Figure 1 • Sample Printer Configuration Label
KUNTEM CON*10.CN*10.N Zhang (Redeckton) 10. 24*10=0*10*2*1 100*10=0*10=0*2 +10.0....D=50*7G 10. C IFS....P=1HT SPCID 100.....TGR 2PT TDM OF....P=1HT HOCC 10N 1H.2F....P=1HT TYPE 10N-SW.LT-1E....P=1HT LEA 10N-TW.-TH-1R....P=1HT LEA 10S....P=1HT HIGH 100....L=2L...L=3M 110. 1=7.71=9=667....P=1HT HLD 15. CIN....R=45H....P=1HT LAM 15C-RECTD....IQR COM. 310.2TC-10=4....P=1HT CT COM. 25022....SERIAL COM. 2002....B=5D 5 B TSG....DTM SITE 5OR....P=3RT... 4ON/4OF....RSET -RCCCNTCE 4ON....P=3DCL 4ON....TOM....R 4NO....D=7H....R=7H...R <> 2x...F=4HT P=4HT <> GE....BE INTER CHR <> 2C....2F P=5DE 7F. 11....R=4HPOLER LP 14.28*10....HD# CLOSE 20FALT....B=3ELETT 20C....L=7T...TO... 20C.D....LET P=3ECTION 219*5E.S....HSPENT FUSE 258....HSP BARRER 301....R=4H...R=4H...R 302....K=5H...K=5H...K 303....TAKE ADR. 307....P=5H...P=5H...P 307....R=4H...R=4H...R 308....TANG BASN. 316....TANG DAGE. 320....TWNG LEC. 320....R=5H...R=5H...R 328....R=5H...R 360....R=5H...R 362**. 364...R=5H...R=5H...R 364...R=5H...R 364...R=5H...R 364...R=5H...R 364...R=5H...R 364...R=5H...R 364...R=5H...R 364...R=5H...R 364...R=5H...R 364...R=5H...R 364. R=5H...R 364. R=5H...R 364. R=5H...R 364. R=5H...R 364. R=5H...R 364. R=5H...R 364. R=5H...R 364. R=5H...R 364. R=5H...R 364. R-5H...R 364. R-5H...R 364. R-5H...R 364. R-5H...R 364. R-5H...R 364. R-5H...R 364. R-5H...R 364. R-5H...R 364. R-5H...R 364. R-19V....R=5H...RY 364. R-19V....R=5H...RY 364. R-19V....R=5H...RY 364. R-19V....R=5H...RY 364. R-19V....R=5H...RY 364. R-19V....R=5H...RY 364. R-19V....R=5M...RY 364. R-19V....R=5M...RY 364. R-19V....R=5M...RY 364. R-19V....R=5M...RY 364. R-19V....R=5M...RY 364. R-19V....R=5M...RY 364. R-19V....R=-2M...RY 364. R-19V....R=-2M...RY 364. R-19V....R=-2M...RY 364. R-19V....R=-2M...RY 364. R-19V....R=-2M...RY

Figure 2 • Sample Network Configuration Label
Network Configuration 2000.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1 Printer-AR....LOAD LAN FROM ENTER-AL HIRID....ACTIVE PRINT-AR Wireless F.L....IP "INT"DOU. C20.C59..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..26 F30.C58..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..08..0 F40.C57..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07..07.. Wireless F.L....IP "INT"DOU. C20.C59..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266..266 .. IP "INT"DOU. C25.C58..259..259..259..259..259 .. BUREIT C30.C59.....100.....100.....100.....100.....100.....100.....100.....100.....100.....100.....100.....100.....100.....1 F45.C59.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....99.....9 Wireless F.L....IP "INT"DOU. C25.C58...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...259...2 F35.C57....IP "INT"DOU. C35.C57...BUREIT F45.C58....BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BUREIT F45.C58...BBG....BUREIT F45.C58...BBG....BUREIT F45.C58...BBG....BUREIT F45.C58...BBG....BUREIT F45.C58...BBG....BUREIT F45.C58...BBG....BUREIT F45.C58...BBG....BUREIT F45.C58...BBG....BUSE... F45.C58...BBG....BUSE... F45.C58...BBG....BUSE... F45.C58...BBG....BUSE... F45.C58...BBG....BUSE... F45.C58...BBG....BUSE... F45.C58...BBG....BUSE... F45.C58...BBG....BUSE... F45.C58...BBU....BUSE... F45.C58...BBU....BUSE... F45.C58...BBU....BUSE... F45.C58...BBU....BUSE... F45.C58...BBU....BUSE... F45.C58...BBU....BUSE... F45.C58...BBU....BUSE... F45.C58...BBU....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BUSE... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.CS ....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BBG.... F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.BE....BBG....BAH. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F45.DA. F4WIN: 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13 Clustboth 4, 2,C...... FINE#NATE C/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ D/ C##D C/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/A##D/ C/N...... BUDIC#NDELE C/I...... WHELDI VHELDI C/S...... NHELDI VHELDI C/U...... NHELDI VHELDI C/KD#NDDX-D/B-HDDYD...... FINE#NATE YH#R P/C...... BUDIC#NATE YH#R P/L...... BUDIC#NATE YH#R P/G...... BUDIC#NATE YH#R P/H...... BUDIC#NATE YH#R P/L...... BUDIC#NATE YH#R P/G...... BUDIC#NATE YH#R P/H...... BUDIC#NATE YH#R P/L...... BUDIC#NATE YH#R P/G...... BUDIC#NATE YH#R P/H...... BUDIC#NATE YH#R P/L...... A##NATIEY H#R P/G...... BUDIC#NATE YH#R P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/G...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/G...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDI##NATE YH# P/L...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIC#NATE YH# P/L...... BUDIC#NATE YH# P/H...... BUDIKNATE YH# P/L...... BUDIKNATE YH# P/H...... BUDIKNATE YH# P/L...... BUDIKNATE YH# P/H...... BUDIKNATE YH# P/L...... BUDIKNATE YH# P/H...... BUDIKNATE YH# P/L...... BUDIKNATE YH# P/H...... BUDIKNATE YH# P/L...... BUDIKNATE YH# P/H...... BUDIKINATE YH# P/L...... BUDIKINATE YH# P/H...... BUDIKINATE YH# P/L...... BUDIKINATE YH# P/H...... BUDIKINATE YH# P/L...... BUDIKINATE YH# P/H...... BUDIKINATE YH# P/L...... BUDIKINATE YH# P/H...... BUDIKINATE YH# P/L...... BUDIKINATE YH# P/H...... BUDIKINATY H## P/L...... BUDIKINATY H## P/H...... BUDIKINATY H## P/L...... BUDIKINATY H## P/H...... BUDIKINATY H## P/L...... BUDIKINATY H## P/H...... BUDIKINATY H## P/L...... BUDIKINATY H## P/H...... BUDIKINATY H## P/L...... BUDIKINATY H## P/H...... BUDIKINATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTY H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV H## O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH. O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH . O###TENKATTV IHH .

PAUSE Self Test

This self test can be used to provide the test labels required when making adjustments to the printer's mechanical assemblies or to determine if any printhead elements are not working. Figure 3 shows a sample printout.

To perform a PAUSE self test, complete these steps:

  1. Turn off (O) the printer.

  2. Press and hold PAUSE while turning on (I) the printer. Hold PAUSE until the first control panel light turns off.

- The initial self test prints 15 labels at the printer's slowest speed, and then automatically pauses the printer. Each time PAUSE is pressed, an additional 15 labels print. Figure 3 shows a sample of the labels.

Figure 3 • PAUSE Test Label
Barcode image with standard barcode and corresponding numerical data below it

- While the printer is paused, pressing CANCEL alters the self test. Each time PAUSE is pressed, 15 labels print at 6 in. (152 mm) per second.

- While the printer is paused, pressing CANCEL again alters the self test a second time. Each time PAUSE is pressed, 50 labels print at the printer's slowest speed

- While the printer is paused, pressing CANCEL again alters the self test a third time. Each time PAUSE is pressed, 50 labels print at 6 in. (152 mm) per second.

- While the printer is paused, pressing CANCEL again alters the self test a fourth time. Each time PAUSE is pressed, 15 labels print at the printer's maximum speed.

  1. To exit this self test at any time, press and hold CANCEL.

FEED Self Test

Different types of media may require different darkness settings. This section contains a simple but effective method for determining the ideal darkness for printing bar codes that are within specifications.

During the FEED self test, labels are printed at different darkness settings at two different print speeds. The relative darkness and the print speed are printed on each label. The bar codes on these labels may be ANSI-graded to check print quality.

During this test, one set of labels is printed at 2 ips, and another set is printed at 6 ips. The darkness value starts at three settings lower than the printer's current darkness value (relative darkness of -3) and increase until the darkness is three settings higher than the current darkness value (relative darkness of +3).

To perform a FEED self test, complete these steps:

  1. Print a configuration label to show the printer's current settings.

  2. Turn off (O) the printer.

  3. Press and hold FEED while turning on (I) the printer. Hold FEED until the first control panel light turns off.

The printer prints a series of labels (Figure 4) at various speeds and at darkness settings higher and lower than the darkness value shown on the configuration label.

Figure 4 • FEED Test Label
V50.15 Print Spread 6 Reclusive Conners: 3 2 10/04/2019 7 a a SODYGD150

  1. See Figure 5 and Table 8. Inspect the test labels and determine which one has the best print quality for your application. If you have a bar code verifier, use it to measure bars/spaces and calculate the print contrast. If you do not have a bar code verifier, use your eyes or the system scanner to choose the optimal darkness setting based on the labels printed in this self test.

Figure 5 • Bar Code Darkness Comparison
ZEBRA ZT420 - To perform a FEED self test, complete these steps: - 2

bar | Rotation Type | Code Color | | ------------- | ---------- | | TOO LIGHT | 19 | | SLIGHTLY LIGHT | 20 | | IN SPEC | 21 | | SLIGHTLY DARK | 22 | | TOO DARK | 23 |

Table 8 • Judging Bar Code Quality

Print Quality Description
Too dark Labels that are too dark are fairly obvious. They may be readable but not “in-spec.”The normal bar code bars increase in size.The openings in small alphanumeric characters may fill in with ink.Rotated bar code bars and spaces run together.
Slightly dark Slightly dark labels are not as obvious.The normal bar code will be “in-spec.”Small character alpha numerics will be bold and could be slightly filled in.The rotated bar code spaces are small when compared to the “in-spec” code, possibly making the code unreadable.
“In-spec” The “in-spec”bar code can only be confirmed by a verifier,but it should exhibit some visible characteristics.The normal bar code will have complete, even bars and clear, distinct spaces.The rotated bar code will have complete, even bars and clear, distinct spaces. Although it may not look as good as a slightly dark bar code, the bar code will be “in-spec.”In both normal and rotated styles, small alphanumeric characters look complete.
Slightly light Slightly lightlabels are, in some cases, preferred to slightly dark ones for “in-spec” bar codes.Both normal and rotated bar codes will be in spec, but small alphanumeric characters may not be complete.
Too light Labels that are too light are obvious.Both normal and rotated bar codes have incomplete bars and spaces.Small alphanumeric characters are unreadable.
  1. Note the relative darkness value and the print speed printed on the best test label.
  2. Add or subtract the relative darkness value from the darkness value specified on the configuration label. The resulting numeric value is the best darkness value for that specific label/ribbon combination and print speed.
  3. If necessary, change the darkness value to the darkness value on the best test label.
  4. If necessary, change the print speed to the same speed as on the best test label.

FEED + PAUSE Self Test

Performing this self test resets the printer configuration to the factory default values. Perform a sensor calibration after this self test. (See Calibrate the Ribbon and Media Sensors on page 119.)

To perform a FEED and PAUSE self test, complete these steps:

  1. Turn off (O) the printer.
  2. Press and hold FEED + PAUSE while turning on (I) the printer.
  3. Hold FEED + PAUSE until the first control panel light turns off.
    The printer configuration is reset to the factory default values. No labels print at the end of this test.

CANCEL + PAUSE Self Test

Performing this self test resets the network configuration to the factory default values.

To perform a CANCEL and PAUSE self test, complete these steps:

  1. Turn off (O) the printer.
  2. Press and hold CANCEL + PAUSE while turning on (I) the printer.
  3. Hold CANCEL + PAUSE until the first control panel light turns off.
    The printer's network configuration is reset to the factory default values. No labels print at the end of this test.

Communication Diagnostics Test

The communication diagnostics test is a troubleshooting tool for checking the interconnection between the printer and the host computer. When the printer is in diagnostics mode, it prints all data received from the host computer as straight ASCII characters with the hex values below the ASCII text. The printer prints all characters received, including control codes such as CR (carriage return). Figure 6 shows a typical test label from this test.

ZEBRA ZT420 - Communication Diagnostics Test - 1

Note • The test label prints upside-down.

Figure 6 • Communications Diagnostics Test Label
^FS^F0394.25^AA 5E 40 53 5E 46 4F 33 39 34 2C 32 35 5E 41 41 N.18.10^FD(0000) 4E 2C 31 38 2C 31 38 5E 46 44 28 38 38 38 38 )999-9999^FS 29 39 39 39 20 39 39 39 39 5E 46 53 60 6A ^FO0.50^AAN.18. 5E 46 4F 38 2C 35 38 5E 41 41 4E 2C 31 38 2C 10^FDCENTER STA 31 38 5E 46 44 43 45 4E 54 45 52 28 53 54 41

To use communications diagnostics mode, complete these steps:

  1. Set the print width equal to or less than the label width being used for the test. See Print Width on page 69 for more information.
  2. Set the DIAGNOSTICS MODE option to ENABLED. For methods, see Communication Diagnostics Mode on page 75.

The printer enters diagnostics mode and prints any data received from the host computer on a test label

  1. Check the test label for error codes. For any errors, check that your communication parameters are correct.

Errors show on the test label as follows:

• FE indicates a framing error.
- OE indicates an overrun error.
- PE indicates a parity error.
- NE indicates noise.

  1. Turn the printer off (O) and then back on (I) to exit this self test and return to normal operation.

Sensor Profile

Use the sensor profile image (which will extend across several actual labels or tags) to troubleshoot the following situations:

  • The printer experiences difficulty in determining gaps (web) between labels.
  • The printer incorrectly identifies preprinted areas on a label as gaps (web).
    • The printer cannot detect ribbon.

With the printer in the Ready state, print a sensor profile in one of these ways:

Using the buttons on the control panela. Turn off (O) the printer.b. Press and hold FEED + CANCEL while turning on (I) the printer.c. Hold FEED + CANCEL until the first control panel light turns off.
Using ZPLa. Send the ~JG command to the printer. See the Zebra Programming Guide for more information about this command.
Using the control panel displaya. Navigate to the following item under the SENSORS menu. See Navigating through Screens in the Display on page 90 for information about using the control panel and accessing the menus.ZEBRA ZT420 - Sensor Profile - 1b. Press RIGHT SELECT to select PRINT.

Compare your results to the examples shown in this section. If the sensitivity of the sensors must be adjusted, calibrate the printer (see Calibrate the Ribbon and Media Sensors on page 119).

Ribbon Sensor Profile (Figure 7) The line labeled RIBBON (1) on the sensor profile indicates the ribbon sensor readings. The ribbon sensor threshold setting is indicated by OUT (2). If the ribbon readings are below the threshold value, the printer does not acknowledge that ribbon is loaded.

Figure 7 • Sensor Profile (Ribbon Section)
100 80 RIBRON 60 OUT 40 20 0

Media Sensor Profile (Figure 8) The line labeled MEDIA (1) on the sensor profile indicates the media sensor readings. The media sensor threshold settings is indicated by WEB (2). The media out threshold is indicated by OUT (3). The downward spikes (4) indicate gaps between labels (the web), and the lines between the spikes (5) indicate where labels are located.

If you compare the sensor profile printout to a length of your media, the spikes should be the same distance apart as the gaps on the media. If the distances are not the same, the printer may be having difficulty determining where the gaps are located.

Figure 8 • Sensor Profile (Media Section)
100 80 COMEDIA 1 2 40 20 OUT 3 0

ZEBRA ZT420 - Sensor Profile - 4

Notes •

Specifications

This section lists general printer specifications, printing specifications, ribbon specifications, and media specifications.

Contents

General Specifications.... 174

Printing Specifications 175

Media Specifications 176

Ribbon Specifications.... 177

General Specifications

Model ZT410TM ZT420TM
Height 12.8 in.(325 mm) 12.8 in. (325 mm)
Width 10.7 in. (272 mm) 13.2 in. (335 mm)
Depth 19.7 in. (500 mm) 19.7 in. (500 mm)
Weight 36 lb (16 kg) 40 lb (18 kg)
Electrical 90–265 VAC, 48-62 Hz 90–265 VAC, 48-62 Hz
Power consumptionPrinting PAUSE test at slowest speed118.7 W220.0 W
Power consumptionPrinter idle12.0 W12.0 W
Fuses5A5A
TemperatureOperatingThermal Transfer: 41° to 104°F (5° to 40°C)Direct Thermal: 32° to 104°F (0° to 40°C)
Storage-40° to 140°F (-40° to 60°C)
Relative HumidityOperating20% to 85%, non-condensing
Storage5% to 85%, non-condensing
Communication InterfacesStandard InterfacesRS-232/CCITT V.24 serial data interface; 2400 to 115000 baud, parity, bits/character, 7 or 8 data bit, and XON-XOFF, RTS/CTS or DTR/DSR handshake protocol required. 750mA at 5 V from pins 1 and 9.USB 1.1 data interfaceUSB host port10/100 internal EthernetBluetooth version 2.1Near Field Communication (NFC)Optional Interfaces8-bit parallel data interface; nibble mode compliantWireless card support 802.11 b2.4GHzDSSS (DBPSK, DQPSK and CCK)RF power 10 mW (ZebraNet b/g Print Server) 802.11 g2.4GHzOFDM (16-QAM and 64-QAM with BPSK and QPSK)RF power 10 mW (ZebraNet b/g Print Server)

Printing Specifications

Model ZT410 ZT420
Print resolution 203 dpi (dots/in.)/8 dots/mm 203dpi (dots/in.)/8 dots/mm
300 dpi/12 dots/mm 300 dpi/12 dots/mm
600 dpi/24 dots/mm N/A
Dot size (nominal)(width x length)203 dpi 0.0049 in. x 0.0049 in.(0.125 mm x 0.125 mm)0.0049 in. x 0.0049 in.(0.125 mm x 0.125 mm)
300 dpi 0.0033 in. x 0.0039 in.(0.084 mm x 0.099 mm)0.0033 in. x 0.0039 in.(0.084 mm x 0.099 mm)
600 dpi 0.0016 in. x 0.0016 in.(0.042 mm x 0.042 mm)N/A
Maximum print width 203 dpi 4.09 in. (104 mm)6.6 in. (168 mm)
300 dpi 4.09 in. (104 mm) 6.6 in. (168 mm)
600 dpi 4.09 in. (104 mm) N/A
Bar code modulus (X) dimension
Picket fence (nonrotated)orientation203 dpi 4.9 mil to 49 mil 5 mil to 50 mil
300 dpi 3.3 mil to 33 mil 3.3 mil to 33 mil
600 dpi 1.6 mil to 16 mil N/A
Ladder (rotated)orientation203 dpi 4.9 mil to 49 mil 5 mil to 50 mil
300 dpi 3.9 mil to 39 mil 3.9 mil to 39 mil
600 dpi 1.6 mil to 16 mil N/A
Programmable constant print speeds203 dpi 2.4 in. to 14 in.(61 mm to 356 mm) persecond in 1-in. (25.4 mm) increments2.4 in. to 12 in.(61 mm to 305 mm) persecond in 1-in. (25.4 mm) increments
300 dpi 2.4 in. to 10 in.(61 mm to 254 mm) persecond in 1-in. (25.4 mm) increments2.4 in. to 10 in.(61 mm to 203 mm) persecond in 1-in. (25.4 mm) increments
600 dpi 1.5 in. to 4 in.(38 mm to 102 mm) persecond in 1-in. (25.4 mm) incrementsN/A

Media Specifications

Model ZT410 ZT420
Label length Minimum Non-RFID
Tcar-off 0.5 in. (12.7 mm) 0.5 in. (12.7 mm)
Peel-off 0.5 in (12.7 mm) 0.5 in (12.7 mm)
Rewind 0.5 in. (12.7 mm) 0.5 in. (12.7 mm)
Cutter 1.0 in. (25.4 mm) 1.0 in. (25.4 mm)
RFID Varies for each transponder type
Maximum200 or 300 dpi39 in. (991 mm)
600 dpi20 in. (508 mm)
Maximum continuous media print length200 dpi157 in. (3988 mm)102 in. (2590 mm)
300 dpi73 in. (1854 mm) 45in. (1143 mm)
600 dpi39 in. (991 mm)N/A
Label widthMinimumNon-RFID1.0 in. (25.4 mm)2 in. (51 mm)
RFID Varies for each transponder type
MaximumTear/Cutter4.5 in. (114 mm) 7.0in. (178 mm)
Peel/Rewind4.25 in. (108 mm)6.75 in. (171 mm)
Total thickness(includes liner, if any)Minimum0.0023 in.(0.058 mm)0.0023 in.(0.058 mm)
Maximum0.010 in. (0.25 mm)
Maximum roll outside diameter8 in. (203 mm)on a 3-in. (76-mm) inside diameter core
Inter-label gapMinimum0.079 in. (2 mm)
Preferred0.118 in. (3 mm)
Maximum0.157 in. (4 mm)
Ticket/tag notch size (width x length)0.25 in. x 0.12 in.(6 mm x 3 mm)
Hole diameter0.125 in. (3.18 mm)
Notch or hole position (centered frominner media edge)Minimum0.15 in. (3.8 mm)
Maximum2.25 in. (57 mm)3.5 in. (90 mm)
Density, in Optical Density Units (ODU) (black mark)>1.0 ODU
Maximum media density≤0.5 ODU
Transmissive media sensor (fixed position)7/16 in. (11 mm) from inside edge

Ribbon Specifications

Model ZT410 ZT420
Ribbon width* Minimum 2 in.** (51 mm**)
Maximum ribbon length 1476 ft (450 m) 1476 ft (450 m)
Ribbon core inside diameter 1 in. (25 mm)

* Zebra recommends using ribbon that is at least as wide as the media to protect the printhead from wear.

** Depending on your application, you may be able to use ribbon narrower than 2 in. (51 mm), as long as the ribbon is wider than the media being used. To use a narrower ribbon, test the ribbon's performance with your media to assure that you get the desired results.

ZEBRA ZT420 - Contents - 1

Notes •

Glossary

alphanumeric Indicating letters, numerals, and characters such as punctuation marks.

backfeed When the printer pulls the media and ribbon (if used) backward into the printer so that the beginning of the label to be printed is properly positioned behind the printhead. Backfeed occurs when operating the printer in Tear-Off and Applicator modes.

bar code A code by which alphanumeric characters can be represented by a series of adjacent stripes of different widths. Many different code schemes exist, such as the universal product code (UPC) or Code 39.

black mark A registration mark found on the underside of the print media that acts as a start-of-label indication for the printer. (See non-continuous media.)

calibration (of a printer) A process in which the printer determines some basic information needed to print accurately with a particular media and ribbon combination. To do this, the printer feeds some media and ribbon (if used) through the printer and senses whether to use the direct thermal or thermal transfer print method, and (if using non-continuous media) the length of individual labels or tags.

configuration The printer configuration is a group of operating parameters specific to the printer application. Some parameters are user selectable, while others are dependent on the installed options and mode of operation. Parameters may be switch selectable, control panel programmable, or downloaded as ZPL II commands. A configuration label listing all the current printer parameters may be printed for reference.

continuous media Label or tag-stock media that has no notch, gap, or web (media liner only) to separate the labels or tags. The media is one long piece of material.

core diameter The inside diameter of the cardboard core at the center of a roll of media or ribbon.

diagnostics Information about which printer functions are not working that is used for troubleshooting printer problems.

die-cut media A type of label stock that has individual labels stuck to a media liner. The labels may be either lined up against each other or separated by a small distance. Typically the material surrounding the labels has been removed. (See non-continuous media.)

direct thermal A printing method in which the printhead presses directly against the media. Heating the printhead elements causes a discoloration of the heat-sensitive coating on the media. By selectively heating the printhead elements as the media moves past, an image is printed onto the media. No ribbon is used with this printing method. Contrast this with thermal transfer.

direct thermal media Media that is coated with a substance that reacts to the application of direct heat from the printhead to produce an image.

dynamic RAM The memory devices used to store the label formats in electronic form while they are being printed. The amount of DRAM memory available in the printer determines the maximum size and number of label formats that can be printed. This is volatile memory that loses the stored information when power is turned off.

fanfold media Media that comes folded in a rectangular stack. Contrast this with roll media.

firmware This is the term used to specify the printer's operating program. This program is downloaded to the printer from a host computer and stored in FLASH memory. Each time the printer power is turned on, this operating program starts. This program controls when to feed the media forward or backward and when to print a dot on the label stock.

FLASH memory FLASH memory is non-volatile and maintains the stored information intact when power is off. This memory area is used to store the printer's operating program. In addition, this memory can be used to store optional printer fonts, graphic formats, and complete label formats.

Font A complete set of alphanumeric characters in one style of type. Examples include CG Times ^TM , CG Triumvirate Bold Condensed ^TM .

ips (inches-per-second) The speed at which the label or tag is printed. Many Zebra printers can print from 1 ips to 12 ips.

label An adhesive-backed piece of paper, plastic, or other material on which information is printed.

label backing (liner) The material on which labels are affixed during manufacture and which is discarded or recycled by the end-users.

light emitting diode (LED) Indicators of specific printer status conditions. Each LED is either off, on, or blinking depending on the feature being monitored.

liquid crystal display (LCD) The LCD is a back-lit display that provides the user with either operating status during normal operation or option menus when configuring the printer to a specific application.

media Material onto which data is printed by the printer. Types of media include: tag stock, die-cut labels, continuous labels (with and without media liner), non-continuous media, fanfold media, and roll media.

media sensor This sensor is located behind the printhead to detect the presence of media and, for non-continuous media, the position of the web, hole, or notch used to indicate the start of each label.

media supply hanger The stationary arm that supports the media roll.

non-continuous media Media that contains an indication of where one label/printed format ends and the next one begins. Examples are die-cut labels, notched tag-stock, and stock with black mark registration marks.

non-volatile memory Electronic memory that retains data even when the power to the printer is turned off.

notched media A type of tag stock containing a cutout area that can be sensed as a start-of-label indicator by the printer. This is typically a heavier, cardboard-like material that is either cut or torn away from the next tag. (See non-continuous media.)

peel-off A mode of operation in which the printer peels a printed label away from the backing and allows the user to remove it before another label is printed. Printing pauses until the label is removed.

print speed The speed at which printing occurs. For thermal transfer printers, this speed is expressed in terms of ips (inches per second).

printhead wear The degradation of the surface of the printhead and/or the print elements over time. Heat and abrasion can cause printhead wear. Therefore, to maximize the life of the printhead, use the lowest print darkness setting (sometimes called burn temperature or head temperature) and the lowest printhead pressure necessary to produce good print quality. In the thermal transfer printing method, use ribbon that is as wide or wider than the media to protect the printhead from the rough media surface.

registration Alignment of printing with respect to the top (vertical) or sides (horizontal) of a label or tag.

ribbon A band of material consisting of a base film coated with wax or resin “ink.” The inked side of the material is pressed by the printhead against the media. The ribbon transfers ink onto the media when heated by the small elements within the printhead. Zebra ribbons have a coating on the back that protects the printhead from wear.

ribbon wrinkle A wrinkling of the ribbon caused by improper alignment or improper printhead pressure. This wrinkle can cause voids in the print and/or the used ribbon to rewind unevenly. This condition should be corrected by performing adjustment procedures.

roll media Media that comes supplied rolled onto a core (usually cardboard). Contrast this with fanfold media.

supplies A general term for media and ribbon.

symbology The term generally used when referring to a bar code.

tag A type of media having no adhesive backing but featuring a hole or notch by which the tag can be hung on something. Tags are usually made of cardboard or other durable material.

tear-off A mode of operation in which the user tears the label or tag stock away from the remaining media by hand.

thermal transfer A printing method in which the printhead presses an ink or resin coated ribbon against the media. Heating the printhead elements causes the ink or resin to transfer onto the media. By selectively heating the printhead elements as the media and ribbon move past, an image is printed onto the media. Contrast this with direct thermal.

void A space on which printing should have occurred, but did not due to an error condition such as wrinkled ribbon or faulty print elements. A void can cause a printed bar code symbol to be read incorrectly or not at all.

Index

A

active print server user menu item, 102

adhesive test for ribbon coating, 19

adjustments

display contrast

LCD contrast user menu item, 97

ways to adjust, 72

label left position, 69

maximum label length, 70

print darkness, 67

print width, 69

printhead pressure, 124

tear-off position, 68

antenna element

ways to set, 81

B

bar codes

bar code does not scan, 150

bar codes label, 71

darkness comparison during FEED self test, 165

battery disposal, 144

baud rate

user menu item, 115, 117, 118

ways to set, 87

black mark media

described, 17

selecting media type, 67

setting media type through user menu, 94

BlueTooth

view address, 117

broken ribbon, 151

buttons on control panel, 14

C

calibration

Auto Calibrate failed, 150

how to set as head-close action, 73

how to set as power-up action, 72

media/ribbon cal user menu item

SENSORS menu, 113

TOOLS menu, 98

procedure, 119

SHORT CAL

how to set for head-close action, 73

how to set for power-up action, 72

ways to initiate, 75

Canadian DOC compliance, 4

cancel a label format, 14

CANCEL button

CANCEL self test, 163

location, 14

channel

user menu item, 105

ways to view, 79

cleaning

cutter module, 140

exterior of printer, 131

media compartment, 131

peel-off assembly, 136

printhead and platen roller, 132

recommended cleaning schedule, 130

sensors, 131

command character

user menu item, 111

ways to set, 84

communication diagnostics mode

how to initiate, 75

overview, 169

user menu item, 99

communication interfaces, 24

communications problems, 159

configuration label

network

printing using CANCEL self test, 163

user menu item, 106

ways to print, 71

printer

printing from TOOLS menu, 97

printing using CANCEL self test, 163

ways to print, 71

conformity declaration, 3

connect printer to computer or network, 24

connect printer to power source, 27

continuous media

described, 17

selecting media type, 67

setting media type through user menu, 94

control character

user menu item, 111

ways to set, 84

control panel

button function, 14

error messages, 155

location, 13

navigation, 90

CUT ERROR message, 158

Cutter mode

cleaning the cutter module, 140

CUT ERROR message, 158

description and media path, 31

how to select, 69

select print mode through user menu, 95

D

darkness

how to make adjustments, 67

print quality too light or too dark, 149

user menu item, 94

data bits

user menu item, 115

ways to set, 87

data cables, 26

data source

connections, 24

site selection considerations, 23

declaration of conformity, 3

default gateway

user menu item, 103, 104

ways to view or set, 77

default reset, 74

delimiter character

user menu item, 112

ways to set, 84

diagnostic mode

how to initiate, 75, 169

user menu item, 99

diagnostics, 162

Direct Thermal mode

how to specify, 68

media scratch test, 18

display

contrast

LCD contrast user menu item, 97

ways to adjust, 72

location, 14

missing characters, 160

display language

how to change from unfamiliar language, 160

user menu item

LANGUAGE menu, 111

SETTINGS menu, 96

ways to change, 83

disposal of printer parts, 144

E

electronics cover, 13

enable ZBI

ways to tell if ZBI is enabled, 76

ZBI enabled user menu item, 99

error messages, 155

ESSID

user menu item, 105

ways to view, 78

Ethernet

characteristics of a wired connection, 25

characteristics of wireless connection, 26

external view of printer, 13

F

fanfold media

described, 17

loading, 35

FCC compliance, 4

FCC radiation exposure limits, 4

feed a label

how to set as head-close action, 73

how to set as power-up action, 72

through the control panel, 14

FEED button

FEED and PAUSE self test, 168

FEED self test, 165

location, 14

fonts label, 71

formats label, 71

G

gap/notch

illustrations, 17

selecting media type, 67

sensor selection through user menu, 113

setting media type through user menu, 94

ways to select media sensor type, 86

gateway

user menu item, 103, 104

ways to view or set, 77

H

HEAD COLD message, 157

HEAD COLD message

cycling with other messages, 157

displaying alone, 157

HEAD OPEN message, 155

head-close action

how to change, 73

user menu item, 98

Home menu, 91

host handshake

user menu item, 115

ways to set, 88

Human Input Device (HID), 100

|

idle display

how to change what displays, 72

user menu item, 97

images distorted on labels, 159

images label, 71

indicator lights

combined with error message, 155

location, 14

troubleshooting, 146

initiate manual calibration, 75

inspect for shipping damage, 22

IP address

user menu item, 102, 104

ways to view or set, 77

IP protocol

user menu item, 103, 104

ways to select IP protocol, 78

IP resolution

IP protocol user menu item, 103, 104

ways to select IP protocol, 78

L

label left position

how to adjust, 69

user menu item, 95

label length

how to adjust maximum value, 70

user menu item, 96

label sensor

user menu item, 113

ways to set sensitivity of sensor, 86

label shift, 69

label width, 69

labels did not print, 159

labels not printing, 159

language

how to change from unfamiliar language, 160

user menu item

LANGUAGE menu, 111

SETTINGS menu, 96

ways to change display language, 83

last saved settings, 74

LCD contrast

how to adjust, 72

user menu item, 97

LCD error messages, 155

LENGTH

how to set as head-close action, 73

how to set as power-up action, 72

liability, 2

Liner Take-Up mode

description and media path, 31, 32

how to select, 69

select print mode through user menu, 95

load defaults

how to load printer or print server defaults, 74

network

user menu item, 106

ways to initiate, 74

user menu item, 98

location for printer, 23

lubrication, 144

M

MAC address

user menu item, 103, 105

ways to view, 78

manual calibration

media/ribbon cal user menu item

SENSORS menu, 113

TOOLS menu, 98

procedure, 119

ways to initiate, 75

maximum label length, 70

media

black mark, 17

continuous roll media, 17

fanfold, 17

non-continuous roll media, 17

perforated, 17

RFID "smart" labels, 16

tag stock, 16

types of media, 16

web, 17

media door, 13

MEDIA OUT message, 155

media scratch test, 18

media sensor

sensor type user menu item, 113

ways to select, 86

media sensor calibration

media/ribbon cal user menu item

SENSORS menu, 113

TOOLS menu, 98

procedure, 119

ways to initiate, 75

media type

how to select, 67

user menu item, 94

melted ribbon, 151

misregistration of labels, 149

missing print on labels, 148

N

navigation, 90

Near Field Communication (NFC), 15

network configuration label

user menu item, 106

ways to print, 71

network settings

load defaults

user menu item, 106

ways to initiate, 74

reset network

user menu item, 106

ways to reset, 79

NO MOTION

how to set as head-close action, 73

how to set as power-up action, 72

non-continuous media

described, 17

problem with labels, 160

selecting media type, 67

0

operating conditions, 23

ordering replacement parts, 144

OUT OF MEMORY message, 158

P

parallel port

characteristics of parallel connection, 26

specifications, 174

parity

user menu item, 115

ways to set, 87

PAUSE button

FEED and PAUSE self test, 168

location, 14

PAUSE self test, 164

Peel-Off mode

cleaning peel-off assembly, 136

description and media path, 31, 32

how to select, 69

select print mode through user menu, 95

perforated media, 17

PH NOT AUTHENTICATED message, 156

power

connect to power source, 27

power cord specifications, 28

site selection, 23

Power-On Self Test (POST)

how to perform, 162

printer locks up during POST, 160

power-up action

how to change, 72

user menu item, 97

print darkness setting, 67

PRINT HEAD OVERTEMP message, 157

print information

how to print various printer information, 71

NETWORK MENU (network configuration label), 106

SENSORS menu (sensor profile), 113

TOOLS menu (printer configuration label), 97

print method

how to specify, 68

user menu item, 94

print mode

how to select, 69

user menu item, 95

print quality

bar code does not scan, 150

darkness comparison during FEED self test, 165

printhead pressure adjustment, 124

troubleshooting, 148

print server

active print server user menu item, 102

channel

user menu item, 105

characteristics of wired connection, 25

characteristics of wireless connection, 26

default gateway

user menu item, 103, 104

ways to view or set, 77

ESSID

user menu item, 105

ways to view or set, 78

IP address

user menu item, 102, 104

ways to view or set, 77

IP protocol

user menu item, 103, 104

ways to select IP protocol, 78

MAC address

user menu item, 103, 105

ways to view, 78

network configuration label

user menu item, 106

ways to print, 71

reset network settings

user menu item, 106

ways to reset, 79

signal

user menu item, 105

ways to view or set, 79

subnet mask

user menu item, 102, 104

ways to view or set, 77

print speed

how to select, 67

selection, 67

user menu item, 94

print station, 100

print width

how to adjust, 69

user menu item, 95

printer configuration label, 71

printer diagnostics, 162

printer locks up, 160

printer settings

darkness, 67

label left position, 69

maximum label length, 70

media type, 67

print method, 68

print mode, 69

print speed, 67

print width, 69

reprint mode, 70

settings not taking effect, 160

tear-off position, 68

printhead

adjust printhead pressure, 124

HEAD COLD message, 157

how to clean, 132

PH NOT AUTHENTICATED message, 156

PRINT HEAD OVERTEMP message, 157

THERMISTOR PREPLACE PRINTHEAD

message, 157

programming position

view or set through user menu, 109

ways to set, 81

Q

QR codes with error messages, 155

QuickHelp pages, 155

R

radiation exposure limits, 4

read power

view or set through user menu, 109

ways to set, 82

read RFID data

through user menu, 108

ways to perform, 80

read/write position, 81

recycling printer parts, 144

reflective sensor

selecting through user menu, 113

ways to select, 86

registration loss during printing, 148

relative humidity

operating, 23

operating and storage, 174

reload last saved settings, 74

replacement parts, 144

report shipping damage, 22

reprint mode

how to set and use, 70

user menu item, 95

reset network settings

user menu item, 106

ways to reset, 79

reset printer to default values, 74

RFID

"smart" labels, 16

troubleshooting, 152

RFID status

view through user menu, 108

ways to view, 80

RFID test

initiate through user menu, 109

ways to perform, 80

ribbon

adhesive test, 19

broken or melted ribbon, 151

determining coated side, 18

removal, 128

ribbon not detected correctly, 151

scratch test, 19

setting print method to Thermal Transfer mode, 68

when to use, 18

wrinkled ribbon, 151

RIBBON IN message, 155

RIBBON OUT message, 156

ribbon sensor calibration

media/ribbon cal user menu item

SENSORS menu, 113

TOOLS menu, 98

procedure, 119

ways to initiate, 75

roll media

described, 16

loading, 35

routine cleaning schedule, 130

run a ZBI program

user menu item, 99

ways to run, 76

S

scratch test

media type, 18

ribbon coated side, 19

self tests, 162

CANCEL, 163

communication diagnostics, 169

FEED, 165

FEED and PAUSE, 168

PAUSE, 164

Power-On Self Test (POST), 162

sensor profile, 71

print from user menu, 113

sensor type

user menu item, 113

ways to select, 86

sensors

interpreting sensor profile, 170

serial port

characteristics of serial connection, 25

specifications, 174

SETTINGS menu, 94

setup

unpack the printer, 22

shipping

report damage, 22

reshipping the printer, 22

SHORT CAL

how to set as power-up action, 72

how to set for head-close action, 73

signal

user menu item, 105

ways to view, 79

site selection for printer, 23

"smart" labels, 16

smudge marks on labels, 149

spacing requirements, 23

specifications

power cord, 28

stop a ZBI program

user menu item, 99

ways to stop, 76

storing the printer, 22

subnet mask

user menu item, 102, 104

ways to view or set, 77

surface for printer, 23

T

tag calibration

initiate through user menu, 108

ways to initiate, 82

tag stock

described, 16

take label

user menu item, 114

ways to set intensity of sensor, 86

Tear-Off mode

description and media path, 30

how to select, 69

select print mode through user menu, 95

tear-off position

how to adjust, 68

user menu item, 95

temperature

operating, 23

operating and storage, 174

Thermal Transfer mode

how to specify, 68

media scratch test, 18

THERMISTOR REPLACE PRINTHEAD

message, 157

TOOLS menu, 97

transmissive sensor

selecting through user menu, 113

ways to select, 86

troubleshooting

communications problems, 159

diagnostic tests, 162

error messages, 155

indicator lights, 146

print quality problems, 148

RFID problems, 152

ribbon problems, 151

types of media

black mark media, 17

continuous roll media, 17

fanfold media, 17

non-continuous roll media, 17

perforated media, 17

RFID "smart" labels, 16

tag stock, 16

web media, 17

U

unpack the printer, 22

USB host port

copying a file from a USB Flash drive, 100

location, 13

printer does not recognize USB device, 161

printing a file from a USB Flash drive, 100

saving a file to a USB Flash drive, 100

USB port

characteristics of USB connection, 25

specifications, 174

V

valid RFID label counter

view or reset through user menu, 110

ways to reset, 82

ventilation requirements, 23

vertical drift

top-of-form position, 149

void RFID label counter

view or reset through user menu, 110

ways to reset, 82

W

web media

described, 17

wired print server

characteristics, 25

specifications, 174

wireless print server

channel

user menu item, 105

ways to view, 79

characteristics, 26

ESSID

user menu item, 105

ways to view, 78

signal

user menu item, 105

ways to view, 79

specifications, 174

wrinkled ribbon causes, 151

write power

view or set through user menu, 109

ways to set, 82

Z

Zebra Basic Interpreter (ZBI)

run a ZBI program

user menu item, 99

ways to run, 76

stop a ZBI program

user menu item, 99

ways to stop, 76

ways to tell if ZBI is enabled, 76

ZBI enabled user menu item, 99

ZPL mode

user menu item, 112

ways to select, 85

ZPL override

how to enable and commands affected, 83

user menu item, 111

ZEBRA TECHNOLOGIES

Zebra Technologies Corporation

Zebra Technologies Corporation

475 Half Day Road, Suite 500

Lincolnshire, IL 60069 USA

T: +1 847 634 6700

Toll-free +1 866 230 9494

F:+1 847 913 8766

Zebra Technologies Europe Limited

Dukes Meadow

Millboard Road

Bourne End

Buckinghamshire, SL8 5XF, UK

T: +44 (0)1628 556000

F: +44 (0)1628 556001

Zebra Technologies Asia Pacific, LLC

120 Robinson Road

06-01 Parakou Building

Singapore 068913

T: +65 6858 0722

F: +65 6885 0838

http://www.zebra.com

Table of contents Click a title to access it
Manual assistant
Powered by Anthropic
Waiting for your message
Product information

Brand : ZEBRA

Model : ZT420

Category : Label printer