Whirlpool 1997 "E WARNING

vii

© 1997 Whirlpool Corporation

Cooking Products Service Manual

Original March, 1997 4322167

Page vii

CAUTION: BEFORE TOUCHING

ANY OVEN COMPONENTS OR

WIRING, ALWAYS UNPLUG THE

OVEN FROM ITS POWER

SOURCE AND DISCHARGE THE

CAPACITOR BY USING A

20,000-OHM DISCHARGE RESIS-

TOR.

OR

USE AN INSULATED PLASTIC-

HANDLE SCREWDRIVER AND

SHORT ACROSS THE CAPACI-

TOR TERMINALS.

CAUTION

CAUTION: REPLACE BLOWN

FUSE WITH 15 AMPERE CLASS H

FUSE ONLY.

Before replacing the blown oven fuse, test the

upper and lower door interlock switches, cook

relay or latch relay, and interlock monitor switch

(middle switch) for proper operation as de-

scribed in the component test procedures.

DO NOT ATTEMPT TO REPAIR STICKING

CONTACTS OF ANY INTERLOCK SWITCH,

SAFETY SWITCH, OR COOK (LATCH) RE-

LAY (REPLACE SWITCHES).

Any indication of sticking contacts during com-

ponent test requires replacement of that com-

ponent to assure reliability of the safety inter-

lock system.

IF THE FUSE IS BLOWN, THE MONITOR,

PRIMARY INTERLOCK AND SECONDARY

INTERLOCK SWITCHES MUST ALSO BE

REPLACED. BE SURE THEY ARE PROP-

ERLY CONNECTED.

NOTES:

• For proper repair and assembly of the oven

door, refer to pages 2-4 and 2-5.

• Interlock switches are not adjustable indi-

vidually.

• For proper repair and adjustment of the

interlock switches, refer to page 2-8.

WARNING

DISCONNECT FROM POWER SUPPLY

BEFORE SERVICING.

CAUTION: HIGH VOLTAGES ARE

PRESENT DURING THE COOK

CYCLE. EXTREME CAUTION

SHOULD BE OBSERVED AT ALL

TIMES.

CAUTION: DO NOT TOUCH

OVEN COMPONENTS OR WIR-

ING DURING OVEN OPERATION.

ATTACH METER LEADS WITH

ALLIGATOR CLIPS WHEN MAK-

ING OPERATIONAL TESTS.

CAUTION: IT IS NEITHER NEC-

ESSARY NOR ADVISABLE TO

ATTEMPT MEASUREMENT OF

HIGH VOLTAGES.

Whirlpool microwave ovens have a monitoring

system designed to assure proper operation

of the safety interlock systems.

The interlock monitor switch will immediately

cause the oven fuse to blow if the door is

opened while the following combined failure

exists:

Primary door interlock switch and/or second-

ary interlock switch contacts failed in a closed

position.

Contents

Main Page TABLE OF CONTENTS iii Page iv IMPORTANT SAFETY INFORMATION Fire Hazard Electrical Shock Hazard WARNING NOTE CAUTION WARNING CAUTION WARNING TO SERVICE TECHNICIANS OR CAUTION WARNING R.F. LEAKAGE TEST CAUTION EQUIPMENT TEST THEORY OF OPERATION 1-2 N L1 3 1 11 N L1 3 1 13 COMPONENT SECTIONS COMPONENT ACCESS GENERAL REMOVING THE MICROWAVE OVEN & CABINET WARNING 2-3 Removing The Cabinet THE PROTECTION CONTROL SYSTEM REMOVING THE OVEN DOOR REMOVING THE OVEN DOOR COMPONENTS REMOVING THE CONTROL PANEL TURN PANEL OVER REMOVING THE LINE FUSE REMOVING/ADJUSTING THE INTERLOCK SWITCHES REMOVING A SWITCH MAKING ADJUSTMENTS 2-9 1997 Whirlpool Corporation INSET 1 Original March, 1997 4322167 Page 2-9 INSET 2 SECONDARY INTERLOCK REMOVING THE BASE THERMAL FUSE REMOVING THE MAGNETRON THERMAL FUSE REMOVING THE CONVECTION THERMISTOR 2-13 Page 2-13 REMOVE FIVE AIR DUCT SCREWS CONVECTION THERMISTOR WHITE WIRES REMOVING THE CAVITY THERMAL FUSE THE OPERATING CONTROL SYSTEM REMOVING THE OVEN LIGHT SOCKET REMOVING THE CONTROL CIRCUIT BOARD & THE TURNTABLE INDICATOR CIRCUIT BOARD TURN PANEL OVER INSET CONTROL BOARD REMOVING THE FAN MOTOR REMOVING THE POWER CORD POWER CORD REMOVING THE BLOWER MOTOR CAPACITOR REMOVING THE CONVECTION HEATING ELEMENT 2-21 Page 2-21 REMOVE FIVE AIR DUCT SCREWS VIEWED FROM UNDER TOP PLATE REMOVING THE GAS SENSOR REMOVING THE STIRRER MOTOR REMOVING THE TURNTABLE MOTOR REMOVING THE COOKTOP LIGHT SOCKETS THE HIGH VOLTAGE COMPONENTS ACCESSING THE COMPONENTS REMOVING THE MAGNETRON REMOVING THE HIGH VOLTAGE RECTIFIER AND THE HIGH VOLTAGE CAPACITOR REMOVING THE HIGH VOLTAGE TRANSFORMER Page CAUTION 3-1 Warning To Service Technicians! COMPONENT DESCRIPTION & TESTING IMPORTANT SAFETY INSTRUCTIONS Precautions to Avoid Possible Exposure to Excessive Microwave Energy 3-3 CAUTION WARNING THE THERMAL FUSES THE BLOWER MOTOR CAPACITOR R x 10K THE GAS SENSOR TESTING 1. Set the ohmmeter to the R x 1 THE CONVECTION THERMISTOR R x 10K THE CONVECTION HEATING ELEMENT TESTING 1. Set the ohmmeter to the R x 1 MOTORS Blower Motor Fan Motor Stirrer and Turntable Motors PROGRAMMING CHECKS f 2 f 1 CHARTS Page Page CHECKING THE MICROWAVE POWER OUTPUT CAUTION CHECKING FOR MICROWAVE ENERGY LEAKAGE EQUIPMENT MAKING THE MEASUREMENTS Measuring The Oven With The Cabinet Installed . Measuring The Oven With The Cabinet Removed MEASURING MICROWAVE POWER OUTPUT USING THE IEC-705 RATING STANDARD 3-18 TEST CHARTS R x 1000 COMPONENT TESTING WARNING ELECTRICAL SHOCK HAZARD 3-19 3-20 C. N.C. CONTACTS N.O. CONTACTS 3-21 KEYBOARD MATRIX 3-22 CONTROL CIRCUIT BOARD CHECK LIST 3-24 CONTINUITY TEST CHART DOOR OPEN DOOR CLOSED PRIMARY, MONITOR, & SECONDARY SWITCH CHECKOUT PROCEDURE (+) = CONTINUITY () = NO CONTINUITY 4-1 Page 4-1 11 TECH TIPS 1 CN1 CN5 321 321 1 2 3 1 2 3 Model MH9115XE CONTROL MODULE BK = Black BR = Brown RD = Red YL = Yellow GN = Green BL = Blue PK = Pink WH = White NOTES: 1. Oven is Off. 2. Door is Open. TEMP PROBE STRIP CIRCUITS N 2. DOOR IS OPEN OVEN LIGHT IS ON L1 1. UNIT IS PLUGGED IN CLOCK IS WORKING 4. BLOWER MOTOR IS ON HIGH 5. OVEN IS OFF CAVITY TEMPERATURE IS ABOVE 133F BLOWER MOTOR IS ON LOW 6. COOKTOP LIGHTS ARE ON HIGH OR LOW N L1 3 1 11 7. MICROWAVE COOKING IS ON 8. CONVECTION COOKING IS ON N L1 SPECIFICATIONS 4-7 Page 4-7 SPECIFICATION CHARTS 4-8 4-9 Page 4-9 4-10 4-11 Page 4-11 4-12 4-13 Page 4-13 4-14 4-15 MODEL & SERIAL NUMBER EXPLANATION SERIAL PLATE LOCATION 4-16 WHIRLPOOL MICROWAVE HOOD WARRANTY LENGTH OF WARRANTY WHIRLPOOL WILL PAY FOR: WHIRLPOOL WILL NOT PAY FOR: