Whirlpool 1997 "E CONTROL CIRCUIT BOARD CHECK LIST

3-23

© 1997 Whirlpool Corporation

Cooking Products Service Manual

Original March, 1997 4322167

Page 3-23

Power

Level

1 4 Seconds 18 Seconds

2 6 Seconds 16 Seconds

3 8 Seconds 14 Seconds

4 10 Seconds 12 Seconds

5 12 Seconds 10 Seconds

6 14 Seconds 8 Seconds

7 16 Seconds 6 Seconds

8 18 Seconds 4Seconds

9 20 Seconds 2Seconds

10 22 Seconds 0Seconds

TEST PROCEDURE RESULTCOMPONENT

Relay 2 (RY2)

WARNING: When you apply

power to the unit, be careful

not to touch any of the high

voltage circuits.

Set the ohmmeter to the

R x 1

scale, and check for continuity

between the two relay terminal

pins. Use the following steps.

1.Remove the wire connectors

from the relay terminals.

2.Use a pair of alligator clips,

and clip the ohmmeter leads

to the two terminals of the re-

lay. Make sure that you do not

allow the clips to short to any-

thing.

3.Plug the microwave oven into

an AC receptical.

4.Set the power level, as shown

in the chart in the right col-

umn, and check the relay op-

eration for the ten power lev-

els. NOTE: During the operat-

ing time set for each level, the

relay will close (short) for the

time specified in the chart, and

then open for another speci-

fied amount of time. When the

open time elapses, the cycle

begins again until the cooking

time elapses and the oven

turns off.

∞00

OPEN

CLOSED

∞

The following problems indicate a defective

control circuit board:

1. The START function fails to operate, but

the high voltage systems, the interlock

switches, the door sensing, and the relay

checks are good.

2. The oven operates okay with a replace-

ment relay installed.

3. Proper temperature measurements can-

not be obtained.

4. The buzzer does not sound, or continues

to sound.

5. Some segments of one or more digits do

not light up, or they continue to light up,

or segments light when they should not.

6. Wrong figures appear on the display.

7. The digits on the display flicker.

8. Some of the indicators do not light.

9. The clock does not keep the proper time.

CONTROL CIRCUIT BOARD CHECK LIST

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: