TR 212 - Receiver LD Systems - Free user manual and instructions

Product Type	Line transformer for distributed loudspeakers (2 channels)
Brand	LD Systems
Model	TR 212
Number of Channels	2
Power Handling per Channel	120 W
Input Impedances	2 / 4 / 8 Ohms
Output Voltages	25 / 70 / 100 V
Frequency Response	50 Hz - 20 kHz (-1 dB)
Total Harmonic Distortion (THD)	< 0.02%
Transformer Type	Toroidal
Housing Material	Steel chassis
Front Panel Material	Plastic
Dimensions (W x H x D)	142 x 53 x 226 mm
Weight	2.7 kg
Input Connectors	Euroblock 4-pin (pitch 5.08 mm)
Output Connectors	Euroblock 4-pin (pitch 5.08 mm)
Operating Temperature	0 °C - 40 °C
Max. Operating Humidity	< 85% (non-condensing)
Included Accessories	Mounting plates, Euroblock connectors, rubber feet, quick guide
Main Function	Conversion of low-impedance amplifier signal to constant voltage signal for distributed loudspeaker lines
Mounting	Under/on table (plates provided), 19-inch rack (third width) with optional accessory LDTICARK
Safety	Professional use, installation by qualified personnel, compliance with safety distances and regulations
Maintenance	Clean with dry or damp cloth, check ventilation openings, do not use abrasive products
Repairability	No user-serviceable parts, intervention only by authorized qualified personnel
General Information	Compliant with CE directives (LVD, EMC, RoHS), manufactured by Adam Hall GmbH

Frequently Asked Questions - TR 212 LD Systems

What is the use of the LD Systems TR 212?

The TR 212 is a two-channel audio transformer designed to convert a low-impedance amplifier signal (2, 4 or 8 ohms) into a constant voltage signal (25, 70 or 100 V) to power distributed loudspeaker lines in professional installations.

How to connect the input of the TR 212 to an amplifier?

Use the provided Euroblock connectors. Connect the amplifier's speaker output to the INPUT terminals corresponding to the desired impedance (2, 4 or 8 ohms). Observe polarity. For an 8 ohm configuration, use the 8ohm and COM terminals.

What output voltages can I use?

The TR 212 offers three output voltages: 25 V, 70 V and 100 V. Select the voltage suitable for your distributed speaker system by connecting the wires to the corresponding terminals (OUTPUT).

Can I use the TR 212 with a class D amplifier?

Yes, but ensure the amplifier allows connection of an external transformer. If in doubt, contact the amplifier manufacturer to avoid damage.

How to mount the TR 212 under or on a table?

Use the provided mounting plates. Attach them to the housing using the supplied M3 screws, then screw the assembly under the table (or on the table after removing the rubber feet). Fixing screws are not included.

What is the maximum power per channel of the TR 212?

The allowable power per channel is 120 W. Do not exceed this value to avoid damaging the transformer.

Can the TR 212 be mounted in a 19-inch rack?

Yes, thanks to its third-width format. Use the optional LDTICARK accessory (rack mounting tray) to juxtapose several devices from the TICA® series.

What maintenance does the TR 212 require?

Before any intervention, disconnect the power. Clean the surfaces with a clean, damp cloth, without solvents. Regularly dust the ventilation openings and connectors. No internal parts are user-serviceable.

What safety precautions should be observed?

The device is intended for professional use. It must be installed by qualified personnel. Keep minimum distances from flammable materials (0.3 m), do not cover ventilations, and use only recommended accessories.

What is the frequency response of the TR 212?

The frequency response is 50 Hz to 20 kHz with an attenuation of -1 dB, guaranteeing high-quality sound reproduction for installation applications.

USER MANUAL TR 212 LD Systems

Exterior view of a black electronic device labeled 'LD TR 206' (no additional text or symbols visible)

Exterior view of a black electronic device labeled 'TR 212' with 'LD' logo on top (no additional text or symbols visible)

TR 206 / 212

AUDIO LINE TRANSFORMERS

LDTR206 / LDTR212

CONTENTS / INHALTSVERZEICHNIS / CONTENU / CONTENIDO / TREŚĆ / CONTENUTO

ENGLISH

ABOUT THIS MANUAL 4

INTENDED USE 4

DEFINITIONS AND SYMBOL EXPLANATIONS 4

SAFETY INSTRUCTIONS 5

PACKAGING CONTENT 8

INTRODUCTION 8

CONNECTIONS, OPERATING

AND DISPLAY ELEMENTS 9

TERMINAL STRIP CONNECTIONS 10

UNDER / ON-TABLE MOUNTING 11

CARE, MAINTENANCE AND REPAIR 12

DIMENSIONS 13

TECHNICAL DATA 13

DISPOSAL 14

MANUFACTURER'S DECLARATIONS 15

DEUTSCH

INFORMATIONEN ZU DIESER

This device has been developed and manufactured to the highest quality standards to ensure many years of problem-free operation. This is what the name LD Systems stands for with its long-standing experience as a manufacturer of high-quality audio products. Please read this user manual carefully to get the most out of your new LD Systems product.

You can find more information about LD Systems on our website WWW.LD-SYSTEMS.COM

ABOUT THIS MANUAL

• Read the safety instructions and the entire manual carefully before commissioning.
• Observe the warnings on the unit and in the operating instructions.
  • Always keep the operating instructions within reach.
• If you sell or pass on the appliance, be sure to hand over these operating instructions as well, as they are an essential part of the product.

INTENDED USE

The product is a device for professional audio installation!

The product has been developed for professional use in the field of audio installation and is not intended for household use!

Furthermore, this product is intended for installation by qualified personnel with specialist knowledge and for operation by properly trained persons!

Use of the product that is not in accordance with the specified technical data and operating conditions is considered incorrect use!

Liability is exempted when damage and third-party damage to persons and property is caused by inappropriate use!

The product is not suitable for:

- Use by persons (including children) with limited physical, sensory or mental abilities or lack of experience and knowledge.

- Children (children must be ordered not to play with the device).

DEFINITIONS AND SYMBOL EXPLANATIONS

1. DANGER: The word DANGER, possibly in combination with a symbol, indicates immediately dangerous situations or conditions risking life and limb.
2. WARNING: The word WARNING, possibly in combination with a symbol, indicates potentially dangerous situations or conditions for life and limb.
3. CAUTION: The word CAUTION, possibly in combination with a symbol, is used to indicate situations or conditions that may lead to injury.
4. ATTENTION: The word ATTENTION, possibly in combination with a symbol, refers to situations or conditions that can cause damage to property and/or the environment.

This symbol identifies hazards that can cause electric shock.

This symbol identifies hazardous areas or hazardous situations.

This symbol indicates hazards caused by hot surfaces.

This symbol indicates dangers due to high volume levels.

This symbol indicates additional information on the operation of the product.

This symbol denotes a device that does not contain any user-serviceable parts.

This symbol indicates a device that may only be used in dry rooms.

SAFETY INSTRUCTIONS

DANGER:

1. Do not open the device and do not make any modifications.
2. If your device no longer functions properly, if liquids or objects get inside it or if it has been damaged in any other way, switch it off immediately and disconnect it from the mains. The device may be repaired only by authorised repair technicians.
3. For devices of protection class 1, the protective conductor must be connected correctly. Never disconnect the protective conductor. Devices of protection class 2 do not have a protective conductor.
4. Ensure that live cables are not kinked or otherwise mechanically damaged.
5. Never bypass the device fuse.

WARNING:

1. The device may not be operated if it shows obvious signs of damage.
2. The device may only be installed in a voltage-free state.
3. If the power cable of the device is damaged, do not operate the device.
4. Permanently attached power cables may only be replaced by a qualified person.

ATTENTION:

1. Do not operate the device if it has been exposed to large temperature fluctuations (for example, after transport). Moisture and condensation can damage the device. Switch on the device only when it has reached room temperature.
2. Make sure that the voltage and frequency of the mains supply correspond to the values indicated on the device. If the device has a voltage selector switch, do not turn the device on until it has been set correctly. Use only suitable power cables.
3. To disconnect the device from the mains at all poles, it is not sufficient to press the on/off switch on the device.
4. Make sure that the fuse used corresponds to the type specified on the device.
5. Make sure that appropriate measures have been taken against overvoltage (e.g. lightning strike).
6. Observe the specified maximum output current on devices with Power Out connection. Ensure that the total current consumption of all connected devices does not exceed the specified value.
7. Replace pluggable mains cables only with original cables.

DANGER:

1. Danger of suffocation! Plastic bags and small parts must be kept out of reach of persons (including children) with reduced physical, sensory or mental capabilities.
2. Danger caused by falling device! Make sure that the device is securely installed and cannot fall down. Only use suitable stands or mounts (particularly for fixed installations). Ensure that accessories are properly installed and secured. Ensure that all applicable safety regulations are observed.

WARNING:

1. Use the device in the prescribed manner only.
2. Operate the device only with the accessories recommended and intended by the manufacturer.
3. During installation, observe the safety regulations applicable in your country.
4. After connecting the device, check all cable routes to avoid damage or accidents, e.g. due to tripping hazards.
5. Always observe the specified minimum distance to normally flammable materials! Unless explicitly stated, the minimum distance is 0.3 m.

CAUTION:

1. In the case of moving components such as mounting brackets or other moving components, there is a possibility of jamming.
2. In the case of devices with motor-driven components, there is a risk of injury from the movement of the device. Sudden movement of the device can cause shock reactions.

ATTENTION:

1. Do not install or use the device in the vicinity of radiators, heat accumulators, stoves, or other heat sources. Ensure that the device is always installed in such a way that it can be sufficiently cooled and cannot overheat.
2. Do not place ignition sources such as lighted candles near the device.
3. Ventilation openings must not be covered and fans must not be blocked.
4. Use the original packaging or packaging provided by the manufacturer for transport.
5. Avoid shock or impact to the device.
6. Observe the IP protection class as well as the ambient conditions such as temperature and humidity according to the specification.
7. Devices can be continuously further developed. Should there be any discrepancies between the operating instructions and the device labelling with regard to operating conditions, performance or other device characteristics, the information on the device always takes precedence.
8. The device is not suitable for tropical climates and for operation above 2000 m above sea level.

CAUTION:

Connecting signal cables can cause a lot of noise. Make sure that devices connected to the output are muted when plugged in. Otherwise, noise levels may cause damage.

CAUTION: HIGH VOLUME AUDIO PRODUCTS!

This device is designed for professional use.

The commercial operation of this device is subject to the applicable national regulations and guidelines for accident prevention.

Hearing damage due to high volume and continuous exposure: Use of this product may generate high sound pressure levels (SPL) that may cause hearing damage. Avoid exposure to high volumes.

INSTRUCTIONS FOR INDOOR INSTALLATION EQUIPMENT

1. Devices for installation applications are designed for continuous operation.
2. Devices for indoor installation are not weather-resistant.
3. Surfaces and plastic parts can also age in installation equipment, e.g. due to UV irradiation and temperature fluctuations.
   This generally does not impair functionality.
4. With permanently installed devices, the accumulation of impurities, e.g. dust, is to be expected. Always observe the care instructions.
5. Unless explicitly stated otherwise on the device, the devices are intended for installation heights of less than 5 m.

PACKAGING CONTENT

LDTR206

Remove the product from the packaging and remove all packaging material.

Please check the completeness and integrity of the delivery and notify your distribution partner immediately after purchase if the delivery is incomplete or damaged.

The packaging includes:

• 1 x LD TR 206 transformer
• 1 set of terminal blocks
• 1 set of rubber feet (pre-assembled)
• 1 mounting set for on-table or under-table mounting
• Quick guide

LDTR212

Remove the product from the packaging and remove all packaging material.

Please check the completeness and integrity of the delivery and notify your distribution partner immediately after purchase if the delivery is incomplete or damaged.

The packaging includes:

• 1 x LD TR 212 transformer
• 1 set of terminal blocks
• 1 set of rubber feet (pre-assembled)
• 1 mounting set for on-table or under-table mounting
• Quick guide

INTRODUCTION

TR 206

Part of the TICA ^® series, the TR206 is a two-channel 60W loudspeaker transformer designed to take a low impedance amplifier signal and convert it to a constant voltage loudspeaker line. This allows a conventional low impedance amplifier to be used to drive multiple loudspeakers on each of its outputs, when used with loudspeakers that have a constant voltage connection.

Measuring 142 x 44 x 226 mm, its convenient form factor and included mounting plates allow it to be installed discreetly almost anywhere. Alternatively, it fits into 1/3 19-inch rack. Use the optional rack tray to slot several TICA ^® series products alongside each other and build a system to your exact requirements, using minimal rack space.

TR 212

Part of the TICA ^® series, the TR212 is a two-channel 120W loudspeaker transformer designed to take a low impedance amplifier signal and convert to a constant voltage loudspeaker line. This allows a conventional low impedance amplifier to be used to drive multiple loudspeakers on each of its outputs, when used with loudspeakers that have a constant voltage connection.

Measuring 142 x 44 x 226 mm, its convenient form factor and included mounting plates allow it to be installed discreetly almost anywhere. Alternatively, it fits into 1/3 19-inch rack. Use the optional rack tray to slot several TICA ^® series products alongside each other and build a system to your exact requirements, using minimal rack space.

FEATURES

TR 206

• 2 loudspeaker circuits
- 60 W power handling per channel
- Inputs from 8, 4 or 2 Ohm amplifier signals
- Outputs 100 V, 70 V or 25 V line output to loudspeaker circuits
- All-in-one design combining the transformer and protective chassis
- Compact and easy to mount and connect

TR 212

• 2 loudspeaker circuits
• 120 W power handling per channel
- Inputs from 8, 4 or 2 Ohm amplifier signals
- Outputs 100 V, 70 V or 25 V line output to loudspeaker circuits
- All-in-one design combining the transformer and protective chassis
- Compact and easy to mount and connect

CONNECTIONS, OPERATING AND DISPLAY ELEMENTS

OUTPUT INPUT 3 2 2 1 100V 70V 25V COM 100V 70V 25V COM 2 2 8ohm 4 2 COM 8ohm 4 2 COM

The LD TR 206 and LD TR 212 models have identical connections

1 INPUT 1 + 2

Amplifier inputs for amplifiers with low impedance speaker outputs. Terminal blocks are supplied with the device (for pin assignment, see TERMINAL STRIP CONNECTIONS).

Maximum load capacity

TR 206: 2 x 60 Watt TR 212: 2 x 120 Watt

2 OUTPUT 1 + 2

Speaker outputs for 100, 70 and 25 volt installation speakers. Terminal strips are supplied with the device (for pin assignment, see TERMINAL STRIP CONNECTIONS).

3 STRAIN RELIEF

Use the strain relief to protect the terminal strip connections and the terminal blocks from damage and to prevent the terminal blocks from being pulled out unintentionally.

ATTENTION: When using Class D power amplifiers, make sure that the connection of an external transformer cannot damage the power amplifier! If in doubt, contact the manufacturer of the power amplifier.

TERMINAL STRIP CONNECTIONS

INPUTS

8 Ohm Connection Example

AMPLIFIER

LOUDSPEAKER OUT 2 min. 8 ohm INPUT 2 1 8ohm 4 2 COM 8ohm 4 2 COM LOUDSPEAKER OUT 1 min. 8 ohm

4 Ohm Connection Example

AMP 205 SIG RPM CUP VOLUME 1 OUT 2+ OUTPUT 1+ OUTPUT 1-OUT 2- INPUT 2 1 8ohm 4 2 COM 8ohm 4 2 COM

2 Ohm Connection Example

graph TD
    A["AMP 205"] -->|OUT HPM+| B["INPUT"]
    A -->|OUT HPM-| B
    B --> C["Bohm 4 2 COM"]
    B --> D["Bohm 4 2 COM"]

OUTPUTS

OUTPUT 2 1 100V 70V 25V COM 100V 70V 25V COM OUTPUT 2 1 100V 70V 25V COM 100V 70V 25V COM 25V

UNDER / ON-TABLE MOUNTING

There are two recesses on the top and bottom of the enclosure, each with two M3 threaded holes, for mounting underneath or on top of the table. Screw the two enclosed mounting plates to the top or bottom using the enclosed M3 countersunk screws. Now the amplifier can be fixed in the desired position (see illustration, fixing screws not included). For tabletop mounting, the four rubber feet must be removed beforehand.

Technical line drawing of a mechanical or electronic component with four ports and a central grid pattern (no text or symbols)

CARE, MAINTENANCE AND REPAIR

In order to ensure the long-term, proper functioning of the device, it must be regularly cleaned and, if necessary, serviced. The servicing requirement depends on the intensity of use and the environment in which it is used.

We recommend a visual inspection before each operation. Furthermore, we recommend carrying out all the applicable maintenance measures specified below once every 500 operating hours or, in the case of a lower intensity of use, at the latest after one year. Warranty claims may be limited should defects result from inadequate service and maintenance.

CARE (CAN BE PERFORMED BY THE USER)

WARNING! Before carrying out any care and maintenance work, the power supply and, if possible, all device connections must be unplugged.

NOTE! Improper care can lead to impairment or even destruction of the device.

1. Housing surfaces must be cleaned with a clean, damp cloth. Make sure that no moisture can penetrate the device.
2. Air inlets and outlets must be regularly cleaned of dust and dirt. If compressed air is used, make sure that damage to the device is prevented (e.g. fans must be blocked in this case).
3. Cables and connectors must be cleaned regularly and dust and dirt must be removed.
4. In general, no cleaning agents or abrasive agents may be used, as they may damage the surface finish. Solvents in particular, such as alcohol, can impair the function of housing seals.
5. Devices must generally be stored dry and protected from dust and dirt.

MAINTENANCE AND REPAIR (BY QUALIFIED PERSONNEL ONLY)

DANGER! There are live components in the device. Even after disconnecting the mains connection, there may still be residual voltage in the device, e.g. due to charged capacitors.

PLEASE NOTE! There are no user-serviceable assemblies in the device.

PLEASE NOTE! Maintenance and repair work may only be carried out by adequately qualified personnel. If in doubt, consult a specialist workshop.

PLEASE NOTE! Improperly performed maintenance work may affect warranty claims.

PLEASE NOTE! For conversion or retrofit sets provided by the manufacturer, it is essential to observe the included installation instructions.

DIMENSIONS (mm)

TECHNICAL DATA

Item number LDTR206 LDTR212

Product type Line Transformer for constant voltage loudspeaker lines

Line Transformer for constant voltage loudspeaker lines

Number of Channels 2 2

Input Section

Connector type 4-pin Terminal block, pitch 5.08 mm 4-pin Terminal block, pitch 5.08 mm

Power Handling per channel 60 W 120 W
Input Taps 2 / 4 / 8 Ohm 2 / 4 / 8 Ohm
THD < 0.02% < 0.02%
Frequency response 50 Hz - 20 kHz (-1 dB) 50 Hz - 20 kHz (-1 dB)

Output Section

Connector type 4-pin Terminal block, pitch 5.08 mm 4-pin Terminal block, pitch 5.08 mm

Output Taps 25 / 70 / 100 V 25 / 70 / 100 V

General

Housing Material	Steel chassis	Steel chassis
Front panel material	Plastic	Plastic
Operating Temperature	0°C - 40°C 0°C - 40°C

Item number LDTR206 LDTR212

Max. operating Humidity (non condensing)	85% 85%
Transformer type Toroidal Toroidal
Dimensions (W x H x D)	142 x 53 x 226 mm (height with rubber feet)	142 x 53 x 226 mm (height with rubber feet)
Weight 2.3 kg 2.7 kg
Included Accessories Mounting plates for surface mount applications, Terminal blocks for Electrical Connections.		Mounting plates for surface mount applications, Terminal blocks for Electrical Connections.
Optional Accessories Rack tray (LDTICARK) Rack tray (LDTICARK)

DISPOSAL

Packaging:

1. Packaging can be fed into the reusable material cycle using the usual disposal methods.
2. Please separate the packaging in accordance with the disposal laws and recycling regulations in your country.

Device:

1. This device is subject to the European Directive on Waste Electrical and Electronic Equipment, as amended. WEEE Directive Waste Electrical and Electronic Equipment. Electronic devices and batteries do not belong in household waste. The device or batteries must be disposed of via an authorised waste disposal company or a municipal waste disposal facility. Please observe the applicable regulations in your country!
2. Observe all disposal laws applicable in your country.
3. As a private customer, you can obtain information on environmentally-friendly disposal options from the seller of the product or the appropriate regional authorities.

MANUFACTURER'S DECLARATIONS

MANUFACTURER'S WARRANTY & LIMITATIONS OF LIABILITY

Adam Hall GmbH, Adam-Hall-Str. 1, D-61267 Neu Anspach / E-mail [e-mail] /

Our current warranty conditions and limitation of liability can be found at:

https://cdn-shop.adamhall.com/media/pdf/MANUFACTURERS-DECLARATIONS_LD_SYSTEMS.pdf.

Contact your distribution partner for service.

UKCA-CONFORMITY

Hereby, Adam Hall Ltd. declares that this product meets the following guidelines

(where applicable):

Electrical Equipment (Safety) Regulations 2016

Electromagnetic Compatibility Regulations 2016 (SI 2016/1091)

The Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment

Regulation 2012 (SI 2012/3032)

Radio Equipment Regulations 2017(SI 2016/2015)

UKCA-DECLARATION OF CONFORMITY

Products that are subject to Electrical Equipment(Safety)Regulation 2016, EMC Regulation 2016 or

RoHS Regulation can be requested at [e-mail].

Products that are subject to the Radio Equipments Regulations 2017

(SI2017/1206) can be downloaded from www.adamhall.com/compliance/

CE CONFORMITY

Adam Hall GmbH hereby confirm that this product meets the following guidelines

(where applicable):

R&TTE (1999/5/EC) or RED (2014/53/EU) as of June 2017.

Low Voltage Directive (2014/35/EU)

EMC Directive (2014/30/EU)

RoHS (2011/65/EU)

The complete Declaration of Conformity can be found at www.adamhall.com.

Furthermore, you can also request it at [e-mail].

CE DECLARATION OF CONFORMITY

Declarations of conformity for products subject to the LVD, EMC, RoHS Directive

can be requested from [e-mail].

Declarations of conformity for products subject to RED Directive

can be downloaded from www.adamhall.com/compliance/.

Subject to misprints and errors, as well as technical or other modifications!

DEUTSCH

8 Ohm Connection Example

AMPLIFIER

LOUDSPEAKER OUT 2 min. 8 ohm INPUT 2 1 8ohm 4 2 COM 8ohm 4 2 COM LOUDSPEAKER OUT 1 min. 8 ohm

4 Ohm Connection Example

AMP 205 SIG HPM CLIP SIG CLIP VOLUME VOLUME 1 PUT 2 OUT 2+ OUTPUT 1+ OUTPUT 1-OUT 2- INPUT 2 1 80hm 4 2 COM 80hm 4 2 COM

2 Ohm Connection Example

graph TD
    A["AMP 205"] -->|OUT HPM+| B["INPUT"]
    B -->|OUT HPM-| C["AMP 205"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    subgraph INPUT
        D["8ohm 4 2 COM"]
        E["8ohm 4 2 COM"]
    end
    subgraph OUTPUT
        F["1"]
        G["2"]
    end

OUTPUTS

OUTPUT 2 1 100V 70V 25V COM 100V 70V 25V COM OUTPUT 2 1 100V 70V 25V COM 100V 70V 25V COM 25V

UNTER- / AUFTISCHMONTAGE

Technical line drawing of a mechanical or electronic component with four mounting holes and a central grid pattern (no text or symbols)

Technical line drawing of a rectangular device with internal grid pattern and dimension annotations (43, 53) — no readable text or symbols beyond measurement labels.

Technical diagram of a rectangular enclosure with internal grid pattern and dimension labels (221, 215), no readable text or symbols beyond measurement markers.

TECHNISCHE DATEN

https://cdn-shop.adamhall.com/media/pdf/MANUFACTURERS-DECLARATIONS_LD_SYSTEMS.pdf.

Technical line drawing of a mechanical or electronic component with four ports and a central grid pattern (no text or symbols)

ENTRETIEN, MAINTENANCE ET RÉPARATION

DÉCLARATION DE CONFORMITÉ EU

Technical line drawing of a mechanical or electronic component with four mounting holes and a central grid pattern (no text or symbols)

Technical line drawing of a rectangular device with internal grid pattern and dimension annotations (43 and 53) — no readable text or symbols beyond measurement labels.

Technical drawing of a rectangular enclosure with internal grid pattern and dimension labels (221, 215), no readable text or symbols beyond measurement markers.

CARACTERÉSTICAS TÉCNICAS

https://cdn-shop.adamhall.com/media/pdf/MANUFACTURERS-DECLARATIONS_LD_SYSTEMS.pdf.

Technical line drawing of a mechanical or electronic component with four ports and a central grid pattern (no text or symbols)

PIELEGNACJA, KONSERWACJA I NAPRAWA

https://cdn-shop.adamhall.com/media/pdf/MANUFACTURERS-DECLARATIONS_LD_SYSTEMS.pdf.

Technical line drawing of a mechanical or electronic component with four circular components and mounting brackets (no text or symbols)

Technical line drawing of a rectangular device with internal grid pattern and side supports (no text or symbols)

DATI TECNICI