JMC2427LM - Microwave Oven JENN-AIR - Free user manual and instructions

USER MANUAL JMC2427LM JENN-AIR

Tech Manual Do not remove or destroy W11324887A 08/20 WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. DANGER Electrical Shock Hazard Only authorized technicians should perform diagnostic voltage measurements. After performing voltage measurements, disconnect power before servicing. Failure to follow these instructions can result in death or electrical shock. Voltage Measurement Safety Information When performing live voltage measurements, you must do the following: ■ Verify the controls are in the off position so that the appliance does not start when energized. ■ Allow enough space to perform the voltage measurements without obstructions.■ Keep other people a safe distance away from the appliance to prevent potential injury.■ Always use the proper testing equipment.■ After voltage measurements, always disconnect power before servicing.FOR SERVICE TECHNICIAN’S USE ONLY

IMPORTANT: Electrostatic Discharge (ESD) Sensitive Electronics ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress. ■ Use an antistatic wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance -OR- Touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance. ■ Before removing the part from its package, touch the antistatic bag to a green ground connection point or unpainted metal in the appliance. ■ Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only. ■ When repackaging failed electronic control assembly in antistatic bag, observe above instructions.3

POSSIBLE EXPOSURE TO EXCESSIVE

MICROWAVE ENERGY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary:

3. Seal and Sealing Surfaces (Arcing, Wear and Other Damage)

4. Damage to or Loosening of Hinges and Latches

5. Evidence of Dropping or Abuse

c. Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line, and cavity for proper alignment, integrity and connections. d. Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in service manual before the oven is released to the owner. e. A microwave leakage check to verify compliance with the CSA should be performed on each oven prior to release to the owner. f. Do not attempt to operate the oven if the door glass is broken.FOR SERVICE TECHNICIAN’S USE ONLY

Diagnostics IMPORTANT: Before powering microwave magnetron, be surethat a load, such as a microwave-safe cup of water, is present in the microwave oven cavity. Unplug oven or disconnect power before performing thefollowing checks: ■ A potential cause of a control not functioning is corrosion on connections. Observe connections and check for continuity with an ohmmeter. ■ All tests/checks should be made with a VOM or DVM having a sensitivity of 20,000 Ω per volt DC or greater. ■ Check all connections before replacing components, looking for broken or loose wires, failed terminals, or wires not pressed into connectors far enough. Damaged harness must be entirely replaced. Do not rework a harness. ■ Resistance checks must be made with power cord unplugged from outlet, and with wiring harness or connectors disconnected. IMPORTANT: Do not replace the control if there is no evidence of any failure. To Enter Diagnostics Mode: Before proceeding with any corrective action, perform the following steps to enter the Diagnostics mode.

1. Enter Diagnostics mode by pressing KITCHEN TIMER>TOOLS>KITCHEN

TIMER (repeat twomoretimes). NOTE: You do not need to wait for any audible or visual feedback from the control between keypad presses.

2. If control does not enter Diagnostics, continue repeating the keypad

sequence from Step 1. All the keypads will light up when the control enters Diagnostics.

3. From the Diagnostic menu, scroll to the desired selection using the touch

screen. Error Diagnostics: View and clear the failure history. Component Activation: Manually activate each relay. Sensors & Switches: View the traditional oven cavity temperatures and door/latch switch status. System Information: View the model number, serial number, and software versions. Exit Diagnostics5 General Procedure: Error Codes NOTE: All failures are stored in the failure history. To check if the error code is still present, start a cooking function and wait 1 minute to check if the error appears.

1. Enter Diagnostics mode.

2. Touch or scroll to “Error Diagnostics” in the Diagnostics menu, and then

General Procedure: Software Version For Engineering only. General Procedure: Component Activation

1. Enter Diagnostics mode.

2. Touch or scroll to “Component Activation” in the Diagnostics menu, and

then touch “OK.” NOTE: Touching “Back” will return the display to the main Diagnostics menu.

3. Touching the following selections will activate/deactivate corresponding

relay. Selection Relay MW Light MW Light Relay MW Turntable MW Turntable Relay MW Cooling Fan MW Cooling Fan Relay MW Grill MW Broil Element Relay MW Convection Element MW Convection ElementRelay MW Convection Fan MW Convection fan Relay MW Magnetron/Cooling Fan MW Magnetron and MWCooling Fan Relay General Procedure: Sensors & Switches NOTE: This procedure is to view the current status of oven switches and sensor readings. Display Status MW Door Switch Open or Closed MW Cavity Temperature Degrees in Celsius

2. Touch or scroll to “Sensors & Switches” in the Diagnostics menu, and

3. Touch or scroll through the Sensors & Switches menu to view the desired

Microwave Oven Appliance Control Unit Software Version Diagnostics Entries Number of times Diagnostic menu has been entered

3. Touch or scroll through the System Information menu to view the desired

status. NOTE: Touching “Back” will return the display to the main Diagnostics menu. General Procedure: Model Selection NOTE: When a new User Interface is installed, you will beprompted to select a new model number upon powerup. To change the model number on an existing user interface,follow the steps below.

3. Touch or scroll to “Model Number,” and then touch“OK.”

4. Touch or scroll to the correct model number inthelist, and then touch

“Select.”7 Failure/Error Display Codes No Display - control is blank Switch Mode Power Supply (SMPS), User Interface (UI)

SUGGESTED CORRECTIVE ACTION PROCEDURE

NOTE: Before starting any test, cycle power to the oven(power Off, wait 10seconds, and then power On).

1. Unplug oven or disconnect power.

2. Remove plastic cover from UI. Check connection from display to UI. If the

display is rmly connected, go to Step 3. If display connection is loose, reconnect and go to Step 10.

3. Check wiring from main line to SMPS (CONN 7).

4. Check connection from wiring harness to UI (J15).

5. Check proper voltage input at J15-2 (GND) to J15-4 (14 VDC) on the UI

by completing the following steps:

6. Connect voltage measurement equipment to J15-2 and J15-4 on UI.

7. Plug in oven or reconnect power.

8. Measure voltage and conrm voltage reading is 14VDC. If voltage is

correct, unplug oven or disconnect power and go to Step 13. If voltage isnotcorrect, go to Step 9.

9. Unplug oven or disconnect power. Replace theSMPS.

10. Reassemble all parts and panels before operating.

11. Plug in oven or reconnect power.

12. Check for control board display. If still no display, unplug oven or

13. Replace HMI-Central/UI board.

14. Reassemble all parts and panels before operating.

15. Plug in oven or reconnect power. If the UI was replaced, follow the on-

screen prompts to select themodel number.

16. Verify operation is normal. If problem persists, replacethe Control Panel

Assembly and repeat steps14 through 16.

NOTE: Before starting any test, cycle power to the oven(power Off, wait 10seconds, and power On).

1. Enter the Diagnostic menu, and then touch POWER.

2. To reset Touch Calibration: unplug oven or disconnect power, wait

10seconds, and then pluginoven or reconnect power. If still no response, go to Step 3.

3. Unplug oven or disconnect power.

4. Replace Control Panel Assembly.

5. Reassemble all parts and panels before operating.

6. Plug in oven or reconnect power.

7. Verify operation is normal.

No Sound Speaker, Control Panel Assembly

SUGGESTED CORRECTIVE ACTION PROCEDURE

NOTE: Before starting any test, cycle power to the oven(power Off, wait 10seconds, and power On).

1. Verify sound is enabled. Touch the Tools menu, and then scroll to the

Sound menu. Conrm Key Press, Timer & Alert, and Power On & Off actions are all turned on and set to the desired volume.

2. Unplug oven or disconnect power.

3. Conrm the speaker is rmly connected to the HMI-Central/UI board at

J8. If speaker is rmly connected, go to Step 4. If speaker connection isloose, reconnect and proceed to Step 5.

5. Reassemble all parts and panels before operating.

6. Plug in oven or reconnect power.

7. Conrm operation of the speaker. If problem persists, unplug oven or

disconnect power, replace Control Panel Assembly, and repeat steps 5 through 7. HMI-C User Interface Speaker

Internal E0 Oven user interface (UI) failure

SUGGESTED CORRECTIVE ACTION PROCEDURE

NOTE: Before starting any test, cycle power to the oven(power Off, wait 10seconds, and then power On). PROCEDURE: Before proceeding, verify the error codeby entering the Diagnostics menu and selecting “Error Diagnostics.” NOTE: If other error codes are stored, troubleshoot those other error codes rst.

1. Unplug oven or disconnect power.

2. Conrm the control panel assembly is grounded to the oven chassis. If it

is, go to Step 6. If it is not, x the connection.

3. Reassemble all parts and panels before operating.

4. Plug in oven or reconnect power and cycle power.

5. If error persists, unplug oven or disconnect power.

6. Replace HMI-Central/UI board.

7. Reassemble all parts and panels before operating.

8. Plug in oven or reconnect power and cycle power.

9. If error persists after HMI-Central/UI board is replaced, unplug oven or

disconnect power and replace Control Panel Assembly.

10. Reassemble all parts and panels before operating.

11. Plug in oven or reconnect power. Follow the on-screen prompts for model

12. Verify operation is normal. Enter Diagnostics mode, select “Error

Diagnostics,” and clear the history. If the Control Panel Assembly was replaced, there is no need to clear the error history.

NOTE: Before starting any test, cycle power to the oven (power Off, wait 10seconds, and then power On). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in the microwave oven cavity, and start a microwave cooking function. Wait 1minute, and then verify that the failure happens again.

1. Make sure that all interlock switches work properly: when door is open,

microwave light is On; when dooris closed, microwave light is Off.

2. Unplug oven or disconnect power.

3. Check the following on the Microwave ApplianceManager:

a. Wire connections to Relay 4903. b. Check if Relay 4903 is shorted. If so then gotoStep 7.

4. Reassemble all parts and panels before operating.

5. Plug in oven or reconnect power.

6. To check if the error code is still present, be sure that a load, such as a

microwave-safe cup of water, is present in the microwave oven cavity, and start a cooking function in the microwave oven. Wait 1minute to check if the error appears. If error remains, go to Step 7. If not, go to Step10.

7. Unplug oven or disconnect power and replace the Microwave Appliance

8. Reassemble all parts and panels before operating.

9. Plug in oven or reconnect power.

10. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear thehistory. Line Fuse 20 A Primary Interlock Switch Inverter Microwave Relay

NOTE: Before starting any test, cycle power to the oven (power Off, wait 10seconds, and then power On). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in the microwave oven cavity, and start a microwave cooking function. Wait 1minute, and then verify that the failure happens again.

1. Make sure that all interlock switches work properly: when door is open,

microwave light is On; when dooris closed, microwave light is Off.

2. Unplug oven or disconnect power.

3. Check the following on the Microwave ApplianceManager:

a. Relay 4903. b. Connector P8.

4. Check the following connections on the Inverterboard:

Microwave Inverter Board.

6. Reassemble all parts and panels before operating.

7. Plug in oven or reconnect power.

8. To check if the error code is still present, be sure that a load, such as a

microwave-safe cup of water, is present in the microwave oven cavity, and start a cooking function in the microwave oven. Wait 1minute to check if the error appears. If error remains, then go to Step 9. If not, go to Step 17.

9. Unplug oven or disconnect power.

10. Replace the Magnetron.

11. Reassemble all parts and panels before operating.

12. Plug in oven or reconnect power.

13. To check if the error code is still present, be sure that a load, such as a

microwave-safe cup of water, is present in the microwave oven cavity, and start a cooking function in the microwave oven. Wait 1minute to check if the error appears. If error remains, then go to Step 14. If not, go to Step 17.

14. Unplug oven or disconnect power and replace theMicrowave ACU.

15. Reassemble all parts and panels before operating.

16. Plug in oven or reconnect power.

17. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear thehistory. Magnetron MW Inverter PWM

NOTE: Before starting any test, cycle power to the oven(power Off, wait 10seconds, and power On). PROCEDURE: Before proceeding, verify the error codeby entering the Diagnostics mode and selecting “Error Diagnostics.”

1. Unplug oven or disconnect power.

2. Check that connectors J4, J5, J6, and J7 are rmly connected. If they are

not, go to Step 3. If they are, go to Step 6.

3. Reconnect any loose connectors.

4. Reassemble all parts and panels before operating.

5. Plug in oven or reconnect power. If the failure is gone, go to Step 9. If the

failure is still present, unplug oven or disconnect power.

6. Replace the Control Panel Assembly.

7. Reassemble all parts and panels before operating.

8. Follow the on-screen prompts to select the model number

9. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear the history. If the Control Panel Assembly was replaced, there is no need to clear the error history.

NOTE: Before starting any test, cycle power to the oven (power Off, wait 10seconds, and then power On). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in the microwave oven cavity, and start a microwave cooking function that uses the temperature sensor, such as a Convect cycle. Wait 1minute, and then verify that the failure happens again.

1. Unplug oven or disconnect power.

2. Check that the P22 connection of the Microwave Appliance Manager is

rmly connected. If it is, go to Step 3. If it is not, reconnect and go to Step 5.

3. Disconnect connector P22 from the Microwave Appliance Manager, and

measure the resistance of the thermistor. It should be (approximately) 230kΩ at77°F ± 10°F (25°C ± 10°C).

4. Check thermistor for short to ground. If check on thermistor is not

correct, replace the thermistor. If thermistor check is correct, replace the Microwave Appliance Manager.

5. Reassemble all parts and panels before operating.

6. Plug in oven or reconnect power.

7. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear the history. HMI Right J7J5 J15 User Interface J4J6 HMI Left Control Panel Assembly

NOTE: Before starting any test, cycle power to the oven (power Off, wait 10seconds, and then power On). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in the microwave oven cavity, and start a microwave cooking function. Wait 1minute, and then verify that the failure happens again.

1. Unplug oven or disconnect power.

2. Check that the P21 connection of the Microwave Appliance Manager is

rmly connected. If it is, go to Step 3. If it is not, reconnect and go to Step 5.

3. Disconnect connector P21 from the Microwave Appliance Manager, and

measure the resistance of the thermistor. It should be (approximately) 10kΩ at77°F ± 10°F (25°C ± 10°C).

4. Check thermistor for short to ground. If check on thermistor is not

correct, replace the thermistor. If thermistor check is correct, replace the Microwave Appliance Manager.

5. Reassemble all parts and panels before operating.

6. Plug in oven or reconnect power.

7. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear the history.

NOTE: Before starting any test, cycle power to the oven (power Off, wait 10seconds, and then power On). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in the microwave oven cavity, and start a microwave cooking function that uses the humidity sensor, such as a Steam cycle. Wait 1minute, and then verify that the failure happens again.

1. Unplug oven or disconnect power.

2. Check that the P23 connection of the Microwave Appliance Manager is

rmly connected. If it is, go toStep 3. If it is not, reconnect and go to Step 5.

3. Disconnect connector P23 from Microwave Appliance Manager and

measure the resistance of the sensor: Between pins 3 and 1. It should be approximately 2800 Ω at 77°F ± 10°F (25°C ± 10°C). Between pins 3 and 2. It should be approximately 2800 Ω at 77°F ± 10°F (25°C ± 10°C).

4. Check sensor for short to ground. If checks on sensor are not correct,

replace the sensor. If sensor checks are correct, replace the Microwave Appliance Manager.

5. Reassemble all parts and panels before operating.

6. Plug in oven or reconnect power.

7. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear the history. P21 Microwave Appliance Manager Magnetron Ther mistor Microwave Appliance Manager Humidity Sensor

NOTE: Before starting any test, cycle power to the oven (power Off, wait 10seconds, and then power On). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in the microwave oven cavity, and start a microwave cooking function. Wait 1minute, and then verify that the failure happens again.

1. Unplug oven or disconnect power.

2. Check the following:

a. Cooling fan connection for any loose connectors. b. Oven installation and make sure there is no air blockage at the bottom vent.

3. Reassemble all parts and panels before operating.

4. Plug in oven or reconnect power.

5. To check if the cooling fan is stalled, be sure that a load, such as a

microwave-safe cup of water, is present in the microwave oven cavity, and start a cooking function in the microwave oven. Make sure the fan is running. If it is not, unplug oven or disconnect power, replace the fan and go to Step 8. Ifit is, go to Step 6.

6. Unplug oven or disconnect power.

7. Replace the inverter board.

8. Reassemble all parts and panels before operating.

9. Plug in oven or reconnect power.

10. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear the history.

NOTE: Before starting any test, cycle power to the oven (power Off, wait 10seconds, and then power On). After powering on, be sure that a load, such as a microwave-safe cup of water, is present in the microwave oven cavity, and start a microwave cooking function. Wait 1minute, and then verify that the failure happens again.

1. Unplug oven or disconnect power.

2. Check the following:

a. Cooling fan connection for any loose connectors. b. Oven installation and make sure there is no air blockage at the bottom vent.

3. Reassemble all parts and panels before operating.

4. Plug in oven or reconnect power.

5. To check if the cooling fan is stalled, be sure that a load, such as a

microwave-safe cup of water, is present in the microwave oven cavity, and start a cooking function in the microwave oven. Make sure the fan is running. If it is not, unplug oven or disconnect power, replace the fan and go to Step 8. Ifit is, go to Step 6.

6. Unplug oven or disconnect power.

7. Replace the Magnetron and the inverter board.

8. Reassemble all parts and panels before operating.

9. Plug in oven or reconnect power.

10. Verify operation is normal. Enter the Diagnostics menu, select “Error

F6 E8 Lost communications with Microwave Oven Appliance Manager

SUGGESTED CORRECTIVE ACTION PROCEDURE

NOTE: Before starting any test, cycle power to the oven(power Off, wait 10seconds, and power On). PROCEDURE: Before proceeding, verify the error codeby entering the Diagnostics menu and selecting “Error Diagnostics.”

1. Make sure the oven is plugged in. Open microwave door to check if light

2. Unplug oven or disconnect power.

3. Check the connection between Oven User Interface Board J15-2 (yellow)

and J15-3 (orange) and Microwave Appliance Manager P26-3 (orange) and P26-4 (yellow).

4. If harness is correct, replace the Microwave Appliance Manager.

5. Reassemble all parts and panels before operating.

6. Plug in oven or reconnect power.

7. If the error appears again, unplug or disconnect power and replace HMI-

8. Reassemble all parts and panels before operating.

9. Plug in oven or reconnect power.

10. Follow the on-screen prompts to select the model number if the UI was

11. Verify operation is normal. Enter the Diagnostics menu, select “Error

Diagnostics,” and clear the history. If the Control Panel Assembly was replaced, there is no need to clear the error history.

Cooling Fan Relay Logic The microwave oven blower stays On during cooking functions and may stay On for a few minutes after the cooking function has ended. Component Testing Chart - Microwave Component Serviceable Side Procedure Results - Resistance Component Location Appliance Manager Top Check wiring to microwave appliance manager:

1. Unplug the microwave oven or disconnect power.

2. Visually inspect connectors on the microwave appliance manager,

P1, P2, P8, P21, P22, P23, P26, P354, P355 and the top connectors (relays 4903, 4904 and 4905) to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc.

3. Reassemble all parts and panels before operating.

4. Plug in microwave oven or reconnect power.

Cavity Thermostat Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1).

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Turntable Motor Bottom 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1).

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Normal =2500 Ω (approximately) Abnormal = Innite I17 Component Serviceable Side Procedure Results - Resistance Component Location Monitor Fuse Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Normal = Continuity Abnormal = Innite Not shown MW Light Transformer Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance (ohmmeter scale: Rx1).

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Primary Winding = 40Ω (approximately) Secondary Winding =

0.4 Ω (approximately)

Line Fuse Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Component Serviceable Side Procedure Results - Resistance Component Location Primary Interlock Switch Top Test 1:

1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Primary Interlock Switch.

3. Check from the common terminal (brown wire) to the normally

open terminal (yellow wire).

4. Reconnect the wires at the Primary Interlock Switch.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Test 1: Door Open = Innite Door Closed = Continuity.

1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Primary Interlock Switch.

3. Check from the common terminal (brown wire) to the normally

closed terminal (blue wire).

4. Reconnect the wires at the Primary Interlock Switch.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Test 2: Door Open = Continuity. Door Closed = Innite Secondary Interlock Switch Top 1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Secondary Interlock Switch.

3. Check from the common terminal (blue wire) to the normally open

terminal (white wire).

4. Reconnect the wires at the Secondary Interlock Switch.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Door Open = Continuity. Door Closed = Innite

Monitor Interlock Switch Top 1. Unplug microwave oven or disconnect power.

2. Disconnect the wires at the Monitor Interlock Switch.

3. Check from the common terminal (yellow wire) to the normally

closed terminal (blue wire).

4. Reconnect the wires at the Monitor Interlock Switch.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Door Open = Continuity. Door Closed = Innite N19 Component Serviceable Side Procedure Results - Resistance Component Location Halogen Light Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Normal = approximately 3 Ω Abnormal = Innite

1. Unplug microwave oven or disconnect power.

2. Visually inspect 4 connectors on the MW inverter boards,

CN701, CN702, CN703 and E701 to see whether there are signs of overheating or any signs of failure due to loose wires, bad crimping, etc.

3. Reassemble all parts and panels before operating.

4. Plug in microwave oven or reconnect power.

Magnetron Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads. Check that the seal is in good condition.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Filament Terminals Normal = <1 Ω Filament to Chassis Normal = Innite

Line Filter Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

P31 to P32, P33toP34 Normal >/= 300 kΩ Abnormal </= 100 kΩ P31 to P34, P32 to P33 Normal = 0 Ω Abnormal >/= 100 kΩ

Component Serviceable Side Procedure Results - Resistance Component Location Humidity Sensor Top 1. Unplug microwave oven or disconnect power.

2. Remove the 3-pin connector from MW Appliance Manager.

3. Measure resistance across pins 1 and 3 andacross pins 2 and 3.

4. Replace the 3-pin connector from MWAppliance Manager.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Normal = 2.8 kΩ (approximately) at 77°F +/- 10°F (25°C +/- 10°C) Abnormal = Innite

1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Normal = 10 kΩ (approximately) at 77°F +/- 10°F (25°C +/-10°C) Abnormal = Innite

Grill Thermostat Top 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Convect Thermostat Rear 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Broil Element Rear 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Normal = 9 Ω Abnormal = Innite J21 Component Serviceable Side Procedure Results - Resistance Component Location Convect Element Rear 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Cavity Temperature Sensor Rear 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

Normal = 230 kΩ (approximately) at77°F ±10°F (25°C ±10°C) Abnormal = Innite

Convect Fan Motor Rear 1. Unplug microwave oven or disconnect power.

2. Remove wire leads.

3. Measure resistance.

4. Replace wire leads.

5. Reassemble all parts and panels before operating.

6. Plug in microwave oven or reconnect power.

W11324887A ©2020 All rights reserved. For patent information, please see Pat. www.patent-listing.com W11324887A NOTE: This sheet contains important Technical Service Data.