Whirlpool SPEEDCOOK GH6208 XR User manual

CONSUMER SERVICES TECHNICAL
EDUCATION GROUP PRESENTS
KM-29
JOB AID
Part No. 8178545
SPEEDCOOK
MICROWAVE OVEN
WITH CONVECTION


- ii -
WHIRLPOOL CORPORATION assumes no responsibility for any repairs
made on our products by anyone other than Authorized Service Technicians.
FORWARD
This Whirlpool Job Aid, “Speedcook Microwave Oven With Convection” (Part No. 8178545), pro-
vides the technician with information on the installation, operation, and service of the Speedcook
Microwave Oven With Convection. For specific information on the model being serviced, refer to
the “Use and Care Guide,” or “Tech Sheet” provided with the Speedcook Microwave Oven With
Convection.
The Wiring Diagram and Strip Circuits used in this Job Aid are typical and should be used for
training purposes only. Always use the Wiring Diagram supplied with the product when servicing
the unit.
GOALS AND OBJECTIVES
The goal of this Job Aid is to provide information that will enable the service technician to prop-
erly diagnose malfunctions and repair the Speedcook Microwave Oven With Convection.
The objectives of this Job Aid are to:
Understand and follow proper safety precautions.
Successfully troubleshoot and diagnose malfunctions.
Successfully perform necessary repairs.
Successfully return the microwave oven to its proper operational status.
•
•
•
•
Copyright © 2006, Whirlpool Corporation, Benton Harbor, MI 49022

- iii -
TABLE OF CONTENTS
Page
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Microwave Oven Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Warning To Service Technicians . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Precautions To Be Observed Before And During Servicing To Avoid
Possible Exposure To Excessive Microwave Energy . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
RF Leakage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Precautions To Be Observed While Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Whirlpool Model & Serial Number Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Model & Serial Number Label And Tech Sheet Locations . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
INSTALLATION INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
PRODUCT OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Parts And Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Oven Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Using The Quick Reference Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
COMPONENT ACCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Component Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Removing The Bottom Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Removing A Hood Lamp Socket, Base Thermostat, & Exhaust Fan Motor . . . . . . . . . . . . 4-3
Removing The Turntable Motor & The Air Tube & Vent Base . . . . . . . . . . . . . . . . . . . . . . 4-5
Removing The Relay Control Board And Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Removing The Oven Door Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Removing The Cavity Lamp And The Hood/Light Switch Board . . . . . . . . . . . . . . . . . . . 4-14
Removing The Primary, Secondary, And Monitor Interlock Switches . . . . . . . . . . . . . . . 4-16
Removing The Oven From The Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Removing The Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Removing The FC (Forced Convection) Thermostat, The FC Motor,
And The FC Ring Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Removing The FC Thermistor, And The Cavity Thermostat
& Humidity Sensor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
Removing The Grill Thermostat And Grill Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Removing The Power Supply Cord And AC Line Filter . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
Removing The FC (Forced Convection) Thermoactuator, The Magnetron
Thermistor, And The Magnetron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Removing The Waveguide Thermostat & Exhaust Fan Motor Capacitor . . . . . . . . . . . . 4-29
Removing The Cooling Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
Removing The Inverter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
Removing The Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33

- iv -
COMPONENT TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Base Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Exhaust Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Turntable Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Line Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Door Interlock Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
FC Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
FC Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
FC Ring Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
FC Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Cavity Thermostat & Humidity Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Grill Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Grill Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
FC Thermoactuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Magnetron Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Magnetron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Waveguide Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Exhaust Fan Motor Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Cooling Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
DIAGNOSTICS & TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Primary, Secondary, And Monitor Interlock Switch Checkout Procedure . . . . . . . . . . . . . 6-1
Troubleshooting Circuit Test Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Touch Panel And Relay Control Board Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Microwave Oven Power Output Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Checking The Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
WIRING DIAGRAM & STRIP CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Strip Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
TECH TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Grill Cooking Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
High Voltage Inverter Power Supply Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Page

1-1
GENERAL
MICROWAVE OVEN SAFETY
Your safety and the safety of others is very important.
We have provided many important safety messages in this Job Aid and on the appliance.
Always read and obey all safety messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol and either the word
“DANGER” or “WARNING.” These words mean:
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance
of injury, and tell you what can happen if the instructions are not followed.
You can be killed or seriously injured if you don’t
immediately follow instructions.
You can be killed or seriously injured if you don’t
follow instructions.
DANGER