Whirlpool 1997 "E CAUTION

vi

CAUTION

WARNING TO SERVICE TECHNICIANS

• Proper operation of the microwave ovens

requires that the magnetron be properly

assembled to the waveguide and cavity.

Never operate the magnetron unless it is

properly installed.

• Be sure the “RF” seal is not damaged, and

assembled around the magnetron dome

properly when installing the magnetron.

• Routine service safety procedures should

be exercised at all times.

• Untrained personnel should not attempt

service without a thorough review of the test

procedures and safety information contained

in this manual.

To avoid possible exposure to microwave ra-

diation or energy, visually check the oven for

damage to the door and door seal before

operating the oven. Use your microwave sur-

vey meter to check the amount of leakage

before servicing. In the event that the R.F.

Ieakage exceeds 4 mw/cm2 at 5 cm, appropri-

ate repair must be made before continuing to

service the unit. Check interlock function by

operating the door latch. The oven cook cycle

should cut off before the door can be opened.

The door and latching assembly contains the

radio frequency energy within the oven. The

door is protected by three safety interlock

switches. Do not attempt to defeat them. Un-

der no circumstances should you try to oper-

ate the oven with the door open.

PRECAUTIONS TO BE OBSERVED BEFORE AND DUR-

ING SERVICING TO AVOID POSSIBLE EXPOSURE TO

EXCESSIVE MICROWAVE ENERGY.

1. Do not operate or allow the oven to be

operated with the door open.

2. Make the following safety checks on all

ovens to be serviced before activating the

magnetron or other microwave source,

and make repairs as necessary:

a)Interlock Operation.

b)Proper Door Closing.

c)Seal and Sealing Surfaces (Arcing,

Wear, and Other Damage).

d)Damage to or Loosening of Hinges and

Latches.

e)Evidence of Dropping or Abuse.

3. Before turning on microwave power for

any service test or inspection within the

microwave generating compartments,

check the magnetron, wave guide or trans-

mission line, and cavity for proper align-

ment, integrity, and connections.

4. 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 this

manual before the oven is released to the

owner.

5. A microwave leakage check to verify com-

pliance with the Federal performance

standard should be performed on each

oven prior to release to the owner.

6. Do not attempt to operate the oven if the

door glass is broken.

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: