Whirlpool 1997 "E CHECKING THE MICROWAVE POWER OUTPUT

3-14

Use the following procedure to checkout the

operation of the microwave oven.

1. Fill a 1-cup (260 ml) glass measuring cup

with warm water (between 90˚F/32˚C and

100˚F/38˚C).

2. Open the oven door, place the container

of water into the oven, and close the door.

3. Press the COOK keypad, and set the

cooking time for 4-minutes.

4. Press the START/ENTER keypad. The

oven cavity light should come on, the

cooking cycle should begin, and the timer

should count down in “seconds” from 4:00.

5. After approximately 2-1/2 to 3-minutes,

the water should start to boil. If more than

3-minutes is required, it could mean that

the operating voltage is low, (below 110-

volts), or it is not functioning properly and

may need to be checked by a qualified

technician.

CHECKING THE MICROWAVE POWER OUTPUT

TEST PROCEDURE

OR CORRECTION

1. No power at wall plug.

Console will not display data,

or has incorrect data.

1. Check fuse or breaker

box.

2. Replace line fuse.

3. Check thermal fuse.

4. Check magnetron ther-

mal fuse.

5. Check interlock safety

switches. Replace, if de-

fective.

6. Check control board.

PROBLEM POSSIBLE CAUSE

2. Open line fuse.

3. Thermal fuse.

4. Thermal fuse on magne-

tron.

5. Interlock safety switches.

6. Control board.

1. Magnetron. 1. Check magnetron.

Erratic console display dur-

ing operation.

Display continues to count

down when door is open dur-

ing a “Cook” cycle.

1. Secondary interlock

switch.

1. Check secondary inter-

lock switch. Replace, if

defective.

2. Check control board.

Oven operates without a

“Start” command.

1. Defective control board. 1. Replace control board.

2. Control board.

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: