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Whirlpool GM8155XJB User Manual

Whirlpool GM8155XJB
51 pages
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CONSUMER SERVICES TECHNICAL
EDUCATION GROUP PRESENTS
KM-26
JOB AID
Part No. 8177972
MICROWAVE CONVECTION OVEN
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Whirlpool GM8155XJB Specifications

General IconGeneral
Capacity1.5 cu. ft.
TurntableYes
ColorBlack
Sensor CookingYes
Convection CookingNo
Control TypeElectronic

Summary

FORWARD

GOALS AND OBJECTIVES

To provide detailed information enabling service technicians to diagnose malfunctions and repair the Microwave-Convection Oven.

IMPORTANT SAFETY INFORMATION

Grounding Instructions

Details safety precautions and requirements for grounding the microwave oven.

Warning To Service Technicians

Fuse Replacement Caution

Specific caution regarding the type of fuse to use for replacement.

Replace Sticking Interlock Contacts

Instruction to replace interlock switches and relays with sticking contacts.

Mandatory Interlock Switch Replacement

Mandatory replacement of interlock switches when a fuse blows.

Precautions For Avoiding Microwave Energy Exposure

Interlock and Door Safety Checks

Check interlock operation, door closing, and seals for safety.

Hinge, Latch, and Damage Inspection

Check door hinges, latches, and look for signs of dropping or abuse.

General Safety and Handling Precautions

High Voltage and Component Handling

Safety regarding high voltages, component handling, grounding, and capacitor discharge.

Electrical Safety and Grounding

Power disconnect, grounding plug use, and general hazard warnings.

Ventilation and ESD Protection

Ensure air vents are clear and follow ESD precautions for electronics.

R.F. LEAKAGE TEST

Testing Procedure

Detailed steps for conducting the R.F. leakage test on the microwave oven.

Reporting and Handling Leakage Issues

Procedure for reporting and handling ovens with excessive RF leakage.

COMPONENT ACCESS

Microwave Oven Component Locations

Diagram showing the location of various internal components within the microwave oven.

REMOVING THE MICROWAVE OVEN CABINET

Remove Turntable and Roller Assembly

Remove the glass turntable and roller assembly from the oven cavity.

Remove Cabinet Mounting Screws

Locate and remove specific screws securing the microwave oven cabinet.

Remove Oven Cabinet

Gently pull the cabinet back and unhook it to remove.

REMOVING THE ELECTRONIC OVEN CONTROL

Remove Top Screw

Remove the screw securing the top of the electronic oven control.

Open Microwave Oven Door

Open the microwave oven door to access the control panel.

Slide Out Electronic Oven Control

Slide the control up, unhook tabs, and pull the unit forward.

Disconnect Wire Connectors

Disconnect all wire connectors from the EOC board.

Remove Circuit Board from Panel

Lift locking ring and remove ribbon cable, then remove screws to detach the board.

Remove Board from Locking Arms

Remove three screws and unclip the board from its locking arms.

REMOVING THE DOOR INTERLOCK SWITCHES

Remove Primary Door Interlock Switch

Disconnect wire connector and pull out the primary switch.

Remove Monitor or Secondary Door Interlock Switch

Disconnect wire connector, press locking arm, and rotate switch to remove.

REMOVING THE HUMIDITY SENSOR

Remove Top Cover Screws

Remove the two screws from the top cover.

Lift and Bend Top Cover Clips

Lift the top cover and bend clips to remove the humidity sensor cable.

Disconnect Humidity Sensor Connector

Disconnect the humidity sensor connector CN4 from the control board.

Remove Humidity Sensor

Remove the mounting screw and slide the sensor out of its slot.

REMOVING THE OVEN LAMP, THE DAMPER MOTOR, & DAMPER SWITCH

Remove Oven Lamp

Disconnect wire connector, remove mounting screw, and pull lamp out.

Remove Damper Motor

Disconnect wire connector and remove two mounting screws.

Remove Damper Switch

Disconnect wire connector and remove mounting screw.

REMOVING THE OVEN THERMOSTAT

Disconnect Oven Thermostat Wires

Disconnect wire connectors from the oven thermostat terminals.

Remove Damper Motor Housing Screws

Remove the two screws from the damper motor housing.

Remove Oven Thermostat

Pull damper motor housing out and remove the oven thermostat.

REMOVING THE MAGNETRON

Disconnect Filament Connector

Disconnect the filament connector from the magnetron terminals.

REMOVING THE HIGH VOLTAGE TRANSFORMER

REMOVING THE LINE FUSE & FUSEHOLDER

REMOVING THE HIGH VOLTAGE RECTIFIER, THE HIGH VOLTAGE CAPACITOR, AND THE FAN MOTOR

Caution: Discharge High Voltage Capacitor

Crucial safety step to discharge high voltage capacitor before touching components.

REMOVING THE CONVECTION THERMISTOR, CIRCULATION MOTOR, & CONVECTION ELEMENT

REMOVING THE TURNTABLE MOTOR

Remove Microwave Cabinet

Refer to page 2-2 for the procedure to remove the oven cabinet.

REMOVING THE OVEN DOOR, THE SWITCH ACTUATORS, AND THE OUTER GLASS

Electrical Shock Hazard Warning

Disconnect power before servicing oven door, actuators, and glass.

Disconnect Electrical Power

Disconnect the electrical power to the microwave oven.

HIGH VOLTAGE COMPONENT TESTING

ELEMENT AND SENSOR TESTING

THERMISTOR AND THERMOSTAT TESTING

MAGNETRON AND HIGH VOLTAGE TRANSFORMER TESTING

SWITCH TESTING

DIAGNOSIS & TROUBLESHOOTING

TROUBLESHOOTING CHART

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