Whirlpool 1997 E User Manual

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Page 1

SERVICE MANUAL

for the

OVER-THE-RANGE

MICROWAVE OVEN HOOD

COMBINATION

1997 “E” Models

March, 1997

Printed in U.S.A. LIT4322167

Page 2

THIS MANUAL CONTAINS INFORMATION NECESSARY FOR SERVICING THE WHIRLPOOL MICROWAVE OVEN HOOD COMBINATION , MODELS:

MH7130XE MH7135XE MH9115XE

THE MANUAL IS DESIGNED TO BE USED ONLY BY QUALIFIED SERVICE PERSONNEL. THE SERVICE INFORMATION IS ORGANIZED TO HELP YOU EASILY FIND WHAT YOU NEED.

CHECK YOUR LOCAL BUILDING CODE FOR THE PROPER MODE OF INSTALLATION. IN THE ABSENCE OF LOCAL CODES, THIS UNIT SHOULD BE INSTALLED IN ACCORDANCE WITH THE

NATIONAL ELECTRICAL CODE, ANSI/NFPA NO. 70 - 1990, OR LATEST EDITION, OR C22.1 CANADIAN ELECTRICAL CODE, PART 1

This Microwave Service Manual is for authorized WHIRLPOOLSM service technicians only.

Because of the high voltage and the critical nature of the door closure system for the microwave oven, Whirlpool recommends that customers DO NOT service their own microwave oven.

If you encounter problems with any Whirlpool range having a microwave feature, call your nearest authorized WHIRLPOOLSM Service Company for service.

Page 3

Cooking Products Service Manual

Original March, 1997 4322167

Page iii

TABLE OF CONTENTS

Page

Important Safety Information ...............................................................................................................................v

Theory Of Operation ......................................................................................................................................... 1-1

Component Access ........................................................................................................................................... 2-1

Component Sections .................................................................................................................................. 2-1

General ...............................................................................................................................................................

Removing The Microwave Oven & Cabinet ............................................................................................ 2-2

The Protection Control System .......................................................................................................................

Removing The Oven Door ......................................................................................................................... 2-4

Removing The Oven Door Components.................................................................................................. 2-5

Removing The Control Panel .................................................................................................................... 2-6

Removing The Line Fuse........................................................................................................................... 2-7

Removing/Adjusting The Interlock Switches .......................................................................................... 2-8

Removing The Base Thermal Fuse........................................................................................................ 2-10

Removing The Magnetron Thermal Fuse .............................................................................................. 2-11

Removing The Convection Thermistor .................................................................................................. 2-12

Removing The Cavity Thermal Fuse ..................................................................................................... 2-14

The Operating Control System......................................................................................................................

Removing The Oven Light Socket.......................................................................................................... 2-15

Removing The Control Circuit Board & The Turntable Indicator Circuit Board ..............................2-16

Removing The Fan Motor ........................................................................................................................ 2-17

Removing The Power Cord .....................................................................................................................2-18

Removing The Blower Motor Capacitor................................................................................................. 2-19

Removing The Convection Heating Element ........................................................................................ 2-20

Removing The Gas Sensor .....................................................................................................................2-22

Removing The Stirrer Motor .................................................................................................................... 2-23

Removing The Turntable Motor .............................................................................................................. 2-24

Removing The Cooktop Light Sockets ..................................................................................................2-25

The High Voltage Components .....................................................................................................................

Accessing The Components.................................................................................................................... 2-26

Removing The Magnetron .......................................................................................................................2-27

Removing The High Voltage Rectifier And The High Voltage Capacitor ......................................... 2-28

Removing The High Voltage Transformer............................................................................................. 2-29

2-2

2-4

2-15

2-26

iii

Page 4

Page

Component Description & Testing .................................................................................................................. 3-1

Important Safety Instructions .................................................................................................................... 3-1

The Thermal Fuses..................................................................................................................................... 3-4

The Blower Motor Capacitor ..................................................................................................................... 3-5

The Gas Sensor .......................................................................................................................................... 3-6

The Convection Thermistor ....................................................................................................................... 3-7

The Convection Heating Element............................................................................................................. 3-8

Motors ........................................................................................................................................................... 3-9

Programming Checks ............................................................................................................................... 3-10

Charts ......................................................................................................................................................... 3-11

Checking The Microwave Power Output ............................................................................................... 3-14

Checking For Microwave Energy Leakage ...........................................................................................3-15

Component Testing ..................................................................................................................................3-18

Control Circuit Board Checklist ..............................................................................................................3-23

Primary, Monitor, & Secondary Switch Checkout Procedure............................................................. 3-24

Tech Tips ............................................................................................................................................................ 4-1

Wiring Diagrams.......................................................................................................................................... 4-1

Strip Circuits ................................................................................................................................................ 4-3

Specifications .............................................................................................................................................. 4-6

Model & Serial Number Explanation ...................................................................................................... 4-15

Whirlpool Microwave Hood Warranty..................................................................................................... 4-16

Page 5

IMPORTANT SAFETY INFORMATION

WARNING

This service manual is intended for factoryservice technicians only. We recommend that customers DO NOT service their own units, because of the complexity and risk of highvoltage electrical shock.

The following information is used throughout this manual, and should be read carefully.

NOTE

Cooking Products Service Manual

Original March, 1997 4322167

Fire Hazard

Do not obstruct the flow of ventilation air.

Electrical Shock Hazard

It is the customer’s responsibility to:

• Contact a qualified electrical installer.

Page v

Helpful information that explains a more complicated step, prior to carrying it out.

CAUTION

Information that will help you avoid actions that could cause product damage (scratches, dents, etc.) and damage to personal property.

WARNING

Information that alerts you to potentially dangerous conditions. These conditions can cause serious personal injury (burns, fire and electrical shock, etc.) if the suggested procedures are not observed.

• Assure that electrical installation is adequate and in conformance with the National Electrical Code, ANSl/NFPA 70— latest edition*, and all local codes and ordinances.

Failure to do so could result in fire, electrical shock, or other personal injury.

Take special care when drilling holes into the wall for venting or electrical wiring. Electrical wires may be concealed behind the wall covering.

Failure to do so could result In fire, electrical shock, or other personal injury.

• National Fire Protection Association Batterymarch Park Quincy, Massachusetts 02269

WHIRLPOOL ASSUMES NO RESPONSIBILITY FOR ANY REPAIRS MADE ON OUR PRODUCTS BY ANYONE OTHER THAN AUTHORIZED WHIRLPOOL SERVICE TECHNICIANS.

Page 6

CAUTION

WARNING TO SERVICE TECHNICIANS

To avoid possible exposure to microwave radiation or energy, visually check the oven for damage to the door and door seal before operating the oven. Use your microwave survey meter to check the amount of leakage before servicing. In the event that the R.F. Ieakage exceeds 4 mw/cm 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. Under no circumstances should you try to operate the oven with the door open.

at 5 cm, appropri-

• 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.

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 transmission line, and cavity for proper alignment, 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 compliance 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.

Page 7

CAUTION

WARNING

Whirlpool microwave ovens have a monitoring system designed to assure proper operation of the safety interlock systems.

Cooking Products Service Manual Original March, 1997 4322167

Page vii

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 secondary interlock switch contacts failed in a closed position.

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 described in the component test procedures.

DO NOT ATTEMPT TO REPAIR STICKING CONTACTS OF ANY INTERLOCK SWITCH, SAFETY SWITCH, OR COOK (LATCH) RELAY (REPLACE SWITCHES).

Any indication of sticking contacts during component test requires replacement of that component to assure reliability of the safety interlock system.

IF THE FUSE IS BLOWN, THE MONITOR, PRIMARY INTERLOCK AND SECONDARY INTERLOCK SWITCHES MUST ALSO BE REPLACED. BE SURE THEY ARE PROPERLY CONNECTED.

NOTES:

• For proper repair and assembly of the oven door, refer to pages 2-4 and 2-5.

• Interlock switches are not adjustable individually.

• For proper repair and adjustment of the interlock switches, refer to page 2-8.

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 WIRING DURING OVEN OPERATION. ATTACH METER LEADS WITH ALLIGATOR CLIPS WHEN MAKING OPERATIONAL TESTS.

CAUTION: IT IS NEITHER NECESSARY NOR ADVISABLE TO ATTEMPT MEASUREMENT OF HIGH VOLTAGES.

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 RESISTOR.

USE AN INSULATED PLASTICHANDLE SCREWDRIVER AND SHORT ACROSS THE CAPACITOR TERMINALS.

vii

Page 8

R.F. LEAKAGE TEST

CAUTION

EQUIPMENT

• Electromagnetic energy leakage monitor (NARDA 8100B, HOLADAY H1501).

• 600 ml glass beaker.

• Glass thermometer 100°C or 212° F.

TEST

On every service call, checks for microwave energy emission must be made according to the following manner.

1. Remove the cooking rack from the oven

cavity, if the microwave oven is so equipped.

2. Place a 250 ML (8.0 oz.) glass of water in

the center of the oven bottom.

3. Select “HIGH” cook power, turn the mi-

crowave oven on, and test for R.F. Ieakage at the following locations using the pattern shown below:

a) Around the cabinet at the front. b) Around the door. c) Across the console panel. d) Horizontally across the door. e) Vertically across the door. f) Diagonally across the door. g) Across the air vents. h) Across the rear air vent. i) All lockseams. j) Weld at bottom. k) Bottom plate. I) Oven feet.

4. The scan speed is one inch per second.

When checking for R.F. Ieakage, use an approved R.F. measuring device to assure less than 4 mw/cm a maximum scan rate of 2.5 cm/second, in compliance with U.S. Government Department of Health, Education and Welfare 21 CFR1030, performance Standard for Microwave Ovens.

A properly operating door and seal assembly will normally register small emissions, but they must be no greater than 4 mw/cm measurement uncertainty.

NOTE: Enter leakage readings in space BEFORE and AFTER on the service document.

All microwave ovens exceeding the emission level of 4 mw/cm Service for microwave ovens immediately and the owner should be told not to use the microwave oven until it has been repaired completely.

If a microwave oven is found to operate with the door open, report to Dept. of Service, the manufacturer and CDRH* immediately. Also tell the owner not to use the oven.

* CDRH: Center for Device and Radiological Health, Food

and Drug Administration.

The interlock monitor switch acts as the final safety switch protecting the customer from microwave radiation. If the interlock monitor switch operated to blow the fuse when the interlocks failed you must replace all interlock switches—primary and secondary interlock switches and the monitor switch with new ones because the contacts of those interlock switches may be melted and welded together.

All repairs must be performed in such a manner that microwave energy emissions are minimal.

Address for CDRH is:

Office of Compliance (HFZ-312) Center for Devices and Radiological Health

1390 Piccard Drive Rockville, Maryland 20850

emission at 5 cm distance with

to allow for

must be reported to Dept. of

viii

Page 9

THEORY OF OPERATION

Cooking Products Service Manual Original March 1997 4322167

Page 1-1

The microwave oven is powered by the 120volt line. Whenever the door is closed and a cooking function is programmed through the control panel’s keypad, relay contacts on the control board close, and complete a circuit from the L1 side to the neutral side of the line.

The control board uses five relays to operate the various functions of the microwave oven

Relay 4 controls the speed of the blower motor through the contol panel. The base thermal fuse will also turn the blower motor on to its low speed if the temperature reaches 133˚F. The schematic configuration for relay 4 is shown in the following diagram. The relay is explained in further detail on the following page.

(see below). The relays are controlled by the microcomputer on the control board, and per-

(NC)

(C)

(NO)

form the functions shown below.

RELAY 4

Relay 1 ........................................................ Oven Light/Fan & Stirrer Motors

Relay 2 ........................................................ High Voltage Section

Relay 3 ........................................................ Low-Speed Blower Motor

Relay 4 (N.C. Contacts) ........................... Auto Low-Speed Blower Motor

Relay 4 (N.O. Contacts) ........................... High-Speed Blower Motor

Relay 5 ........................................................ Turntable Motor

BASE

THERMAL

FUSE

BLOWER

MOTOR

(LOW)

(HI)

(C)

CN3

CONTROL

CIRCUIT

BOARD

RELAY RY1

RELAY RY5

MICROCOMPUTER

RELAY RY2

RELAY RY4

RELAY RY3

1-1

Page 10

The normally-closed (N.C.) contacts of relay 4 provide a potential circuit for the Base Thermal Fuse. If the base of the oven exceeds 133˚F, the thermal fuse contacts close, and a circuit for the low-speed side of the blower motor is completed, which turns the motor on. The low-speed blower will operate until the base temperature drops below 104˚F and opens the thermal fuse contacts, and turns off.

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

MICROCOMPUTER

TRANSFORMER

3 1

BOARD

LOW-VOLTAGE

RELAY 4

THERMAL

BASE

FUSE

CAPACITOR

RD RD

BLOWER

MOTOR

(C)(HIGH)

When the low-speed fan is selected by the user at the control panel, relay 3 and the normallyclosed (N.C.) contacts of relay 4, complete the circuit to the low-speed windings of the blower motor and turn it on.

20A LINE

FUSE

RDBK

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

USE

MICROCOMPUTER

LOW-VOLTAGE

TRANSFORMER

3 1

BOARD

RELAY 4

RELAY 3

CAPACITOR

PK/W

(LOW)

BLOWER MOTOR

RDRD

(C)

When the high-speed fan is selected by the user at the control panel, the normally-open (N.O.) contacts of relay 4 complete the circuit to the high-speed windings of the blower motor and turn it on.

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

MICROCOMPUTER

TRANSFORMER

3 1

BOARD

LOW-VOLTAGE

RELAY 4

CAPACITOR

RDRD

(HI) (C)

BLOWER MOTOR

1-2

Page 11

COMPONENT ACCESS

COMPONENT SECTIONS

This section instructs you on how to service the individual components in the Microwave Oven Hood Combination. These components (shown below) and their sections are as follows:

• General

Cabinet

• The Protection Control System

Oven Door Oven Door Components Control Panel Line Fuse Interlock Switches Base Thermal Fuse Magnetron Thermal Fuse Convection Thermistor Cavity Thermal Fuse

Cooking Products Service Manual Original March, 1997 4322167

Page 2-1

• The Operating Control System Oven Light Socket Control Circuit Board Turntable Indicator Circuit Board Fan Motor Power Cord Blower Motor Capacitor Convection Heating Element Gas Sensor Stirrer Motor Turntable Motor Cooktop Light Socket

• The High Voltage Components Magnetron Rectifier Capacitor Transformer

Refer to the section on the following pages for the component you wish to service.

GAS SENSOR (NOT ON ALL MODELS)

BLOWER MOTOR CAPACITOR

CAVITY THERMAL FUSE

CONVECTION HEATING ELEMENT (NOT ON ALL MODELS)

BLOWER MOTOR

CONVECTION THERMISTOR

(NOT ON ALL MODELS)

TURNTABLE MOTOR

COOKTOP LIGHTS

SECONDARY INTERLOCK SWITCH

INTERLOCK MONITOR SWITCH

PRIMARY INTERLOCK SWITCH

CONTROL CIRCUIT BOARD

TURNTABLE INDICATOR CIRCUIT BOARD

LINE FUSE

STIRRER MOTOR

OVEN LIGHT

MAGNETRON

THERMAL FUSE

FAN MOTOR

MAGNETRON

HV CAPACITOR

HV RECTIFIER

HV TRANSFORMER

BASE THERMAL FUSE

Base Thermal Fuse ................................................. Closes @ 133˚F/56˚C, resets @ 104˚F/40˚C.

Magnetron Thermal Fuse ...................................... Opens @ 228˚F/109˚C, resets @ 140˚F/60˚C.

Cavity Thermal Fuse .............................................. Opens @ 230˚F/110˚C, resets @ 140˚F/60˚C.

2-1

Page 12

GENERAL

REMOVING THE MICROWAVE OVEN & CABINET

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

IMPORTANT NOTE: Most of the microwave components can be serviced without removing the unit or its cabinet. They can be accessed by removing the vent grille and the control panel. Before removing the unit or its cabinet, first check the procedure for the component you wish to service to see if it is necessary. If it is necessary to remove the unit and its cabinet to service a component, use the following procedure.

4. Support the front of the microwave oven and remove the two bolts and washers from the top of the oven.

5. Using two people, remove the microwave oven from its mounting location and set it on a protected (padded) work surface.

CAUTION: Because of the weight and size of the microwave oven, two people are required to safely move and install it. Failure to do so could result in personal injury.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the six screws from the base plate and lower it, (see the illustration on the next page), then disconnect the cooktop light connector, and set the base plate aside.

3. Remove the lock pin and washer from the top of the microwave oven.

LOCK PIN & WASHER

6. To remove the vent grille from the microwave oven, remove the two inside screws from the top of the cabinet, then pull the top of the vent grille out so the two center tabs are free of their slots, and remove the grille.

7. Remove the screw from the power cord cover and remove the cover.

8. Remove the remaining screws from the top and rear of the cabinet.

9. Slide the cabinet back and unhook the sides from the tabs, then slide the power cord out of the cabinet, and remove the cabinet.

Proceed to the section for the component you wish to service.

2-2

Page 13

VENT

GRILLE

CABINET

SCREW

VENT

GRILLE

SCREWS (2)

TAB SLOTS

Cooking Products Service Manual Original March, 1997 4322167

CABINET

Page 2-3

POWER

CORD

POWER

CORD COVER

CABINET

SCREWS

BASE

PLATE

CONNECTORS

SLOTS

BASE PLATE

SCREWS

(6)

COOKTOP LIGHT

ASSEMBLY WIRING

Removing The Cabinet

2-3

Page 14

THE PROTECTION CONTROL SYSTEM

REMOVING THE OVEN DOOR

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

LIFT DOOR PINS

OUT OF HINGE HOLES

2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

3. Open the oven door all the way, then lift the door pins out of the hinge holes and remove it.

4. Install the new oven door and the vent grille on the microwave oven.

PINS

HINGES

2-4

Page 15

REMOVING THE OVEN DOOR COMPONENTS

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

Cooking Products Service Manual Original March, 1997 4322167

Page 2-5

4. To remove the oven door choke, use a putty knife along the edges, and pry the choke out from around the inside window frame.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

3. Open the oven door all the way, then lift the door pins out of the hinge holes and remove it (see the illustration on the previous page).

SLOT

HOOKED TAB

GLASS HOOK SPRING OVER TABS

LATCHES

FRAME

OVEN DOOR

PRY OUT CHOKE

5. To replace the latches and door glass assembly, remove the two mounting screws from the end of the glass frame, then push the top and bottom edges of the door out and unsnap the locking tabs from the frame and remove the assembly.

6. Slide the latches down and remove the hooked tabs from the slots in the door frame, then unhook the ends of the spring from the door, and remove the latches.

7. Reassemble the oven door.

8. Reinstall the oven door and vent grille on the microwave oven.

FRAME SCREWS

TOP LOCKING TABS

GLASS FRAME

BOTTOM LOCKING TABS

2-5

Page 16

REMOVING THE CONTROL PANEL

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

3. Remove the screw from the top center tab of the control panel, then lift the panel so that the bottom tabs are out of the slots and pull it forward.

1. Disconnect the electrical supply to the microwave oven.

TURN PANEL OVER

CONTROL PANEL

4. Turn the panel over and disconnect the three harness connectors from the board, then set the control panel aside.

CONTROL

PANEL SCREW

BOTTOM

TABS

BOTTOM

SLOTS

2-6

Page 17

REMOVING THE LINE FUSE

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

Cooking Products Service Manual Original March, 1997 4322167

Page 2-7

2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

3. Remove the control panel from the microwave oven (see page 2-6).

4. From inside the control panel opening, unsnap and open the fuseholder halves.

1. Disconnect the electrical supply to the microwave oven.

CONTROL PANEL

OPENING

5. Remove the line fuse from the fuseholder and pull the wire connectors off the ends.

6. Install the new line fuse and reassemble the microwave oven.

2-7

SLIDE WIRE CONNECTORS

OFF ENDS OF FUSE

LINE FUSE

OPEN FUSEHOLDER

SECTIONS

FUSE HOLDER

Page 18

REMOVING/ADJUSTING THE INTERLOCK SWITCHES

6. One at a time, pull the wire connectors off

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

REMOVING A SWITCH

1. Disconnect the electrical supply to the microwave oven.

2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

3. Remove the control panel from the microwave oven (see page 2-6).

4. Remove the two mounting screws from the interlock switch assembly, and position the assembly so you can easily access the switches and wiring.

5. Refer to inset 1 on the next page for the secondary interlock switch, or inset 2 for any of the other switches mounted on the interlock switch housing assembly, and remove the switch from the housing as shown.

CONTROL PANEL

OPENING

the defective switch, and reconnect them to the same terminals on the replacement switch.

7. Snap the new switch into place on the switch housing.

8. Mount the interlock switch assembly to the chassis flange with two screws.

9. Close the housing cover and secure it with its mounting screw.

MAKING ADJUSTMENTS

1. Plug in the microwave oven and check the operation of the switches. If necessary, loosen the two housing screws, and adjust the housing so that the switches operate properly. NOTE: The Interlock Monitor Switch provides an added safety check on the Primary and Secondary Interlock Switches. If the Primary and Secondary Interlock Switches allow the oven to operate with the door open, the Interlock Monitor Switch will blow the line fuse. Unplug the oven again when you have completed the checks.

2. Reassemble the microwave oven.

INTERLOCK

2-8

SCREW

INTERLOCK

SWITCH

HOUSING

INTERLOCK

SCREW

Page 19

INSET 1

SECONDARY

INTERLOCK

SWITCH

INTERLOCK SWITCH

HOUSING ASSEMBLY

RAISE THIS LOCKING ARM TO RELEASE SWITCH FROM HOUSING.

PRESS BODY IN THIS DIRECTION TO REMOVE SWITCH FROM HOUSING.

Cooking Products Service Manual Original March, 1997 4322167

INSET 2

ALL OTHER

SWITCHES

NOTE: THESE POSTS HOLD THE SWITCH IN PLACE ON THE HOUSING AND ARE STATIONARY.

SECONDARY INTERLOCK

SWITCH

PUSH THIS LOCKING ARM BACK TO UNLOCK SWITCH.

ROTATE SWITCH ON THIS PIN AND REMOVE SWITCH FROM HOUSING.

Page 2-9

WHITE (H.V. Transformer)

SMALL WHITE (Monitor Switch)

LARGE WHITE (Power Cord)

SMALL WHITE (Oven Lamp)

INTERLOCK MONITOR

PRIMARY INTERLOCK

SWITCH

WHITE (Turntable Motor)

WHITE (Secondary Switch)

RED (H.V. Transformer)

PINK (CN2 Pin 1)

Blue (CN2 Pin 3)

Interlock Switch Wiring

2-9

Page 20

REMOVING THE BASE THERMAL FUSE

CONTROL PANEL

OPENING

YELLOW

PINK WHITE

BASE

THERMAL FUSE

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

3. Remove the control panel from the microwave oven (see page 2-6).

4. Remove the mounting screws from the base thermal fuse and remove it.

1. Disconnect the electrical supply to the microwave oven.

5. Unplug the connectors from the terminals of the base thermal fuse.

6. Install the new base thermal fuse and reassemble the microwave oven.

THE BASE THERMAL FUSE CLOSES

AT 133˚F & RESETS @ 104˚F.

2-10

Page 21

Cooking Products Service Manual Original March, 1997 4322167

Page 2-11

REMOVING THE MAGNETRON THERMAL FUSE

4. Unplug the line cord connector and re-

WARNING

Personal Injury Hazard

move the line cord.

5. Unplug the connector from the terminals of the fan motor.

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

REMOVE FIVE

AIR DUCT SCREWS

6. Remove the five screws from the air duct.

7. Lift the air duct and position it so that you can access the magnetron thermal fuse, then remove the mounting screw, and unplug the connectors from its terminals.

8. Install the new magnetron thermal fuse on the air duct, and reassemble the microwave oven.

BOTTOM

OF AIR DUCT

MAGNETRON

THERMAL FUSE

THE MAGNETRON THERMAL FUSE

OPENS AT 228˚F & RESETS @ 140˚F.

2-11

UNPLUG POWER

CORD & FAN MOTOR

BLACK & RED

WIRES

Page 22

REMOVING THE CONVECTION THERMISTOR

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

4. Remove the five screws from the air duct and position it so that you can access the pulley cover underneath.

5. Remove the screws from the circulation pulley cover and the bracket, then remove the cover and the attached brackets from the top of the oven. Do not remove the brackets from the cover.

6. Remove the screw from the convection thermistor and remove the thermistor.

7. Cut the two white wires (not the thermistor wires) coming from the control board next to the splice.

8. Splice the white wires onto the ends of the new convection thermistor wires. Cover the spliced wire ends with electrical tape so that they cannot short to the oven.

9. Mount the new convection thermistor to the oven and reassemble the microwave oven.

2-12

Page 23

BRACKETS

Cooking Products Service Manual Original March, 1997 4322167

CIRCULATION

PULLEY COVER

Page 2-13

SENSOR

COVER

PHILLIPS

SCREW

REMOVE FIVE

AIR DUCT SCREWS

WHITE WIRES

CAUTION: WHEN REPLACING THE

THERMISTOR, DO NOT CUT AND SPLICE

THE WHITE WIRES, OR AN IMPROPER

SIGNAL WILL BE SENT FROM THE THERMISTOR

TO THE MICROCOMPUTER BOARD

CONVECTION THERMISTOR

2-13

Page 24

REMOVING THE CAVITY THERMAL FUSE

3. Remove the vent grille and cabinet from

WARNING

Personal Injury Hazard

the microwave oven (see the illustration on page 2-3).

4. Remove the five screws from the air duct.

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the microwave oven from its mounting location (see page 2-2).

THE CAVITY THERMAL FUSE OPENS AT 230˚F

CAVITY

THERMAL

FUSE

AIR DUCT

AND RESETS AT 140˚F

5. Unplug the connectors from the terminals of the cavity thermal fuse, then lift the left side of the air duct, and remove the cavity thermal fuse. NOTE: There are no mounting screws holding the cavity thermal fuse in place.

6. Install the new cavity thermal fuse in its mounting hole, and reassemble the microwave oven.

REMOVE FIVE

AIR DUCT SCREWS

2-14

Page 25

Cooking Products Service Manual Original March, 1997 4322167

THE OPERATING CONTROL SYSTEM

REMOVING THE OVEN LIGHT SOCKET

4. Remove the mounting screw from the light

WARNING

Personal Injury Hazard

cover and remove the cover.

5. Remove the bulb from the oven light socket.

Page 2-15

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

CUT

SPLICE

BRACKET

SOCKET

(TWIST TO

REMOVE)

BULB

MOUNTING

POST

& SCREW

LOCKING TAB

6. Cut the wires near the old light socket body.

7. Push the locking tab and turn the socket and remove it from the bracket.

8. Remove

/2" of insulation from the cut wire ends of the black and white wires and then splice them to the wires of the new socket with two wire nuts.

9. Install the new light socket and its bulb, and reassemble the microwave oven.

AIRDUCT

2-15

Page 26

REMOVING THE CONTROL CIRCUIT BOARD

& THE TURNTABLE INDICATOR CIRCUIT BOARD

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

PANEL SCREW

TURN PANEL OVER

CONTROL BOARD

CONTROL

3. Remove the screw from the top center tab of the control panel, then lift the panel so that the bottom tabs are out of the slots and turn it over.

To remove the control circuit board,

4. disconnect the three harness connectors and the ribbon cable (see the inset), and remove the three mounting screws.

To remove the turntable indicator cir-

5. cuit board, unplug the connector at CN5, and unsnap it from the locking arms.

6. Install the new circuit board in its mounting location and reassemble the microwave oven.

CN5

LOCKING ARMS

TURNTABLE

INDICATOR

BOARD

MOUNTING

SCREWS

BOTTOM

TABS

DISCONNECT

THREE HARNESS

CONNECTORS

CN3

BOTTOM

SLOTS

INSERT CABLE INTO

REAR CONTACT SLOT

2-16

RIBBON CABLE

COLLAR

UNSNAP/SNAP LOCKING

ARMS ON COLLAR TO

BOTTOM SIDE OF

CONNECTOR

INSET

Page 27

REMOVING THE FAN MOTOR

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

Cooking Products Service Manual Original March, 1997 4322167

Page 2-17

4. Pull the fan blade and press-on washer off the fan motor shaft.

5. Unplug the connector from the fan motor terminals.

6. Remove the two mounting screws from the fan motor and remove the motor from the air duct.

7. Install the new fan motor in its mounting location and reassemble the microwave oven.

MOUNTING SCREW

CONNECTOR

FAN MOTOR

AIR DUCT

FAN BLADE

PRESS-ON WASHER

2-17

Page 28

REMOVING THE POWER CORD

WARNING

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the microwave oven from its mounting location (see page 2-2).

POWER CORD

4. Unplug the connector on the old power cord from the air duct connector and install the new power cord.

5. Reassemble the microwave oven.

POWER CORD CONNECTOR

LOCKING

ARM

AIR DUCT CONNECTOR

2-18

Page 29

REMOVING THE BLOWER MOTOR CAPACITOR

REMOVE FIVE

AIR DUCT SCREWS

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

WIRE NUT

CUT &

SPLICE

WIRES

Cooking Products Service Manual Original March, 1997 4322167

Page 2-19

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

4. Remove the five screws from the air duct.

5. Cut the wires near the body of the blower motor capacitor.

6. Remove

/2" of insulation from the cut wire ends of the red harness wires and then splice them to the wires of the new capacitor with two wire nuts.

7. Install the new blower motor capacitor to the air duct and reassemble the microwave oven.

BLOWER MOTOR

CAPACITOR

AIR DUCT

MOUNTING SCREW

2-19

Page 30

REMOVING THE CONVECTION HEATING ELEMENT

6. Remove the screw from the gas sensor

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

4. Remove the five screws from the air duct, then lift the duct and postion it so you can access the convection heating element.

5. Remove the three phillips screws from the circulation pulley cover and the one from the bracket, and remove the cover and attached brackets from the top of the oven. Do not remove the brackets from the cover.

and position the sensor out of the way.

7. Unhook the drive belt from the circulation fan pulleys and set it aside.

8. Remove the phillips screw from the convection thermistor that is located on the top plate. Remove the thermistor and position it out of the way.

9. Disconnect the wires from the convection heating element terminals.

10. Remove the phillips screws from the top cover, remove it from the oven, and turn it over.

11. Remove the two phillips screws from the convection heating element bracket. Unclip the element from the cover and remove it.

12. Install the new heating element into the mounting clips in the top cover, and secure the mounting bracket with two phillips screws.

13. Reassemble the microwave oven.

2-20

Page 31

UNCLIP

ELEMENT

HERE

HEATING ELEMENT

VIEWED FROM UNDER

TOP PLATE

BRACKETS

Cooking Products Service Manual Original March, 1997 4322167

HEATING ELEMENT

MOUNTING SCREWS

CIRCULATION

PULLEY COVER

Page 2-21

GAS SENSOR

CONVECTION THERMISTOR

SENSOR

COVER

TOP PLATE

MOUNTING SCREWS

TOP PLATE

REMOVE FIVE

AIR DUCT SCREWS

CONVECTION

HEATING ELEMENT

YELLOW

WIRES

2-21

Page 32

REMOVING THE GAS SENSOR

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

SENSOR

COVER

MOUNTING

SCREW

SENSOR

GAS

BOARD

RED

WHT

YEL

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

4. Remove the five screws from the air duct, then lift the duct and postion it so you can access the gas sensor.

5. Remove the screw from the gas sensor board and remove it from the sensor cover, then unplug the connector from the control board.

6. Install the new gas sensor board and then reassemble the microwave oven.

REMOVE FIVE

AIR DUCT SCREWS

2-22

Page 33

REMOVING THE STIRRER MOTOR

REMOVE FIVE

AIR DUCT SCREWS

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

MOUNTING

SCREWS

STIRRER MOTOR

STIRRER

BLADE

COVER

CONNECTOR

TOP

Cooking Products Service Manual Original March, 1997 4322167

Page 2-23

2. Remove the microwave oven from its mounting location (see page 2-2).

3. Remove the vent grille and cabinet from the microwave oven (see the illustration on page 2-3).

4. Remove the five screws from the air duct and lift the duct just enough to access the stirrer motor, then unplug the connector from the stirrer motor terminals.

5. Remove the two mounting screws from the stirrer motor, lift the motor straight up so that the shaft is free of the stirrer blade, and remove the motor.

6. Install the new stirrer motor so the motor shaft fits into the hole of the rectangular pivot on the stirrer blade, and secure the motor to its mounting location.

7. To access the stirrer blade, unsnap the two fasteners from the top cover inside the oven cavity, and lower the cover and the stirrer blade. NOTE: When you reassemble the cover and stirrer blade, make sure that you position the blade with the “TOP” marking facing up.

8. Reassemble the microwave oven.

FASTENERS

2-23

Page 34

REMOVING THE TURNTABLE MOTOR

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. From inside the oven cavity, lift the turntable rest off the shaft of the turntable motor

3. Remove the base plate from the microwave oven and unplug the cooktop light connector (see the illustration on page 2-3).

4. Unplug the connector and remove the two mounting screws from the turntable motor, then remove the motor from the bottom of the microwave oven.

5. Mount the new turntable motor and reassemble the microwave oven.

TURNTABLE REST

BOTTOM OF

OVEN

TURNTABLE

MOTOR

CONNECTOR

2-24

Page 35

REMOVING THE COOKTOP LIGHT SOCKETS

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

2. Remove the base plate from the microwave oven and unplug the cooktop light connector (see the illustration on page 2-3).

Cooking Products Service Manual Original March, 1997 4322167

3. Remove the bulbs from the sockets and unplug the socket wire connector from the microwave oven.

4. To remove the sockets, press the locking tabs near the base of each socket, and twist the socket until the tabs align with the slots in the bracket, then remove the sockets from the bracket.

5. Mount the new sockets to the bracket, reinstall the bulbs, and reassemble the microwave oven.

Page 2-25

TWIST SOCKET

TO REMOVE

BASE

PLATE

CONNECTOR

COOKTOP LIGHTS

2-25

Page 36

THE HIGH VOLTAGE COMPONENTS

WARNING

ACCESSING THE COMPONENTS

The components for service in this section include the:

Magnetron High Voltage Rectifier High Voltage Capacitor High Voltage Transformer

The locations of the high voltage components are shown below. All of the high voltage components are accessible through the front control panel cutout. However, the cabinet must be removed to access the mounting screws for the magnetron. Refer to the following pages for servicing the high voltage components.

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

Discharge the high voltage capacitor before working inside the oven. Failure to do so could result in death or electrical shock.

MAGNETRON

HIGH VOLTAGE

CAPACITOR

HIGH VOLTAGE

RECTIFIER

HIGH VOLTAGE

TRANSFORMER

2-26

Page 37

REMOVING THE MAGNETRON

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

Cooking Products Service Manual Original March, 1997 4322167

2. Discharge the high-voltage capacitor.

3. Remove the microwave oven from its mounting location, then remove the vent grille and the cabinet from the oven (see pages 2-2 and 2-3).

4. Remove the control panel from the microwave oven (see page 2-6).

Page 2-27

1. Disconnect the electrical supply to the microwave oven.

WARNING

Personal Injury Hazard

Disconnect from power supply before servicing. Discharge the capacitor using a 20,000-ohm discharge resistor, or an insulated plastic-handle screwdriver to short across the capacitor terminals.

5. From inside the control panel opening, support the magnetron with one hand, then remove the four mounting screws from the magnetron through the four access holes in the top of the air duct.

6. Unplug the wire connector from the back of the magnetron and remove the magnetron from the oven.

7. Install the new magnetron and reassemble the microwave oven.

MAGNETRON

MOUNTING

SCREWS

MAGNETRON

2-27

CONNECTOR

Page 38

REMOVING THE HIGH VOLTAGE RECTIFIER

AND THE HIGH VOLTAGE CAPACITOR

2. Discharge the high-voltage capacitor.

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

WARNING

Personal Injury Hazard

Disconnect from power supply before servicing. Discharge the capacitor using a 20,000-ohm discharge resistor, or an insulated plastic-handle screwdriver to short across the capacitor terminals.

3. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

4. Remove the control panel from the microwave oven (see page 2-6).

5. From inside the control panel opening, remove the screw from the capacitor bracket, and remove the bracket and capacitor so that you can access the capacitor terminals.

6. Unplug the wire connectors and the high voltage rectifier from the capacitor terminals and remove the capacitor and rectifier from the oven.

7. Install the high voltage rectifier and capacitor and reassemble the microwave oven.

HV RECTIFIER

STRAP

MOUNTING

SCREW

2-28

ORG TO

MAGNETRON

RED TO HV

TRANSFORMER

HV RECTIFIER

Page 39

Cooking Products Service Manual

WARNING

Original March, 1997 4322167

Page 2-29

REMOVING THE HIGH VOLTAGE TRANSFORMER

WARNING

Personal Injury Hazard

Disconnect from the electrical supply before servicing the unit. Failure to do so could result in death or electrical shock.

1. Disconnect the electrical supply to the microwave oven.

Personal Injury Hazard

Disconnect from power supply before servicing. Discharge the capacitor using a 20,000-ohm discharge resistor, or an insulated plastic-handle screwdriver to short across the capacitor terminals.

2. Discharge the high-voltage capacitor.

3. Remove the two screws from the top of the cabinet for the vent grille and remove the grille (see the illustration on page 2-3).

4. Remove the control panel from the microwave oven (see page 2-6).

5. Disconnect the filament wires from the magnetron, then disconnect the three remaining wires from the terminals at the front and back of the high voltage transformer.

6. Remove the three hex nuts from the high voltage transformer and remove the transformer from the oven.

ORG TO

HV CAP

RED & WHITE

PRIMARY WIRES

7. Install the new high voltage transformer and reassemble the microwave oven.

FILAMENT TO MAGNETRON

HV TRANSFORMER

HEX NUTS

2-29

Page 40

— NOTES —

2-30

Page 41

Cooking Products Service Manual Original March, 1997 4322167

Page 3-1

COMPONENT DESCRIPTION & TESTING

IMPORTANT SAFETY INSTRUCTIONS

CAUTION

Warning To Service Technicians!

To avoid possible exposure to microwave radiation or energy, visually check the oven for damage to the door and door seal before operating any oven. Use a microwave survey meter to check the amount of leakage before servicing. In the event the R.F. Ieakage exceeds 4 mW/cm at 5 cm, appropriate 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.

UNDER NO CIRCUMSTANCES SHOULD YOU TRY TO OPERATE THE OVEN WITH THE DOOR OPEN.

• Proper operation of 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 is 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 test procedures and safety information contained in this manual.

PRECAUTIONS TO BE OBSERVED BEFORE AND

DURING SERVICING TO AVOID POSSIBLE EXPOSURE

TO EXCESSIVE MICROWAVE ENERGY

A. Do not operate or allow the oven to be operated with the door open.

B. Make the following safety checks on all ovens to be serviced before activating the magnetron or other

microwave source and make repairs as necessary.

1. Interlock Operation

2. Proper Door Closing

3. Seal and Sealing Surfaces (Arcing, Wear and Other Damage)

4. Damage to or Loosening of Hinges and Latches

5. Evidence of Dropping or Abuse

C. Before turning on the microwave power for any service test or inspection within the microwave

generating components, check the magnetron, wave guide or transmission line and cavity for proper alignment.

D. Any defective or misadjusted components in the interlock, monitor, door seal and microwave

generation and transmission system shall be repaired or adjusted by procedures described in the Basic Service Manuals for the specific microwave oven being serviced before the oven is released to the owner.

E. A microwave leakage check to verify compliance with Federal Performance Standards should be

performed on each oven prior to release to the owner.

F. Do not attempt to operate the oven if the door glass is broken.

3-1

Page 42

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 and the primary door interlock switch and/or the secondary interlock switch contacts fail in a closed position.

CAUTION: REPLACE BLOWN FUSE WITH 15 AMPERE CLASS H FUSE ONLY.

Test the upper and lower door interlock switches, cook relay and interlock monitor switch (middle switch) for proper operation as described in the component test procedures, before replacing the blown oven fuse.

DO NOT ATTEMPT TO REPAIR STICKING CONTACTS OF ANY INTERLOCK SWITCH, SAFETY SWITCH OR COOK (LATCH) RELAY. REPLACE THE SWITCHES AND RELAY.

Any indication of sticking contacts during component tests requires replacement of that component to assure reliability of the safety interlock system.

IF THE FUSE IS BLOWN, THE MONITOR, PRIMARY AND SECONDARY INTERLOCK SWITCHES MUST BE REPLACED. BE SURE THEY ARE PROPERLY CONNECTED.

Precautions to Avoid Possible Exposure

to Excessive Microwave Energy

DO NOT attempt to operate the oven with the door open since open-door operation can result

in harmful exposure to microwave energy. It is important not to defeat or tamper with the safety interlocks.

DO NOT place any object between the oven front face and the door or allow soil or cleaner residue to accumulate on sealing surfaces.

DO NOT operate the oven if it is damaged. It is particularly important that the oven door close properly and that there is no damage to the:

1. Door (bent).

2. Hinges and Latches (broken or loosened).

3. Door Seals and Sealing Surfaces.

DO NOT operate the microwave oven if the door window is broken.

The microwave oven should be checked for microwave leakage by qualified service personnel after a repair is made.

The oven should not be adjusted or repaired by anyone except properly qualified service personnel.

DO NOT operate the microwave oven with the outer cabinet removed.

3-2

Page 43

Cooking Products Service Manual Original March, 1997 4322167

Page 3-3

CAUTION

• High voltages are present during the cook cycle. Extreme caution should be observed at all times.

• Abrasive cleansers, steel-wool pads, gritty wash cloths, etc. can damage the control panel and the interior and exterior oven surfaces. Use a sponge with mild detergent or paper towels with spray glass cleaner. Apply spray glass cleaner to paper towel. Do not spray directly on oven.

• Before touching any oven component or wiring, always unplug the oven from its power source and discharge the capacitor by using a 20,000 ohm discharge resistor or use an insulated plastic handle screwdriver to short across the capacitor terminals.

• Check that the unit is grounded before troubleshooting. Be careful of the high voltage circuits. Discharge any static charge from your body by touching ground before handling any part of the circuitry on the control board. Electrostatic discharge may damage the control circuit.

• Do not touch oven components or wiring during operation. Attach meter leads with alligator clips when making operational tests.

• For continued protection against radiation emission, replace only with these types of switches:

Primary (Interlock) Switch: SZM-V16-FA-63 or VP-533A-OF; Secondary (Interlock) Switch: SZM-V01-FA-32; Interlock (Monitor) Switch: SZM-Vl6-FA-62 or VP-532A-OF; Oven Lamp Switch: SZM-V6-FA-31 or VP-331A-OD.

• It is neither necessary nor advisable to attempt measurement of high voltage.

WARNING

• Disconnect the oven from electrical supply before servicing. Failure to do so could result in electrical shock or death.

• Improper use of the grounding plug can result in a risk of electrical shock. Do not, under any circumstance, cut or remove the third ground prong from the power cord plug.

Fire, Electrical Shock, Excessive

Exposure to Microwave Energy,

Personal Injury & Product

Damage Hazard

• Do not block the rear air intake openings or exhaust vents. Allow a few inches of space at the back of the oven where intake openings and exhaust vents are located. Blocking the air intake openings and exhaust vents can cause damage to the oven and poor cooking results. Make sure the microwave oven legs are in place to ensure proper airflow.

• Do not install the oven next to or over a heat source (a cooktop or range).

• Do not install oven in any area where excessive heat and steam are generated. This could cause fire, electrical shock, excessive exposure to microwave energy, other personal injury or damage to the outside of the cabinet.

• Attaching the adaptor ground terminal to the wall receptacle cover screw does not ground the appliance unless the cover screw is metal and not insulated and the wall receptacle is

grounded through the house wiring.

3-3

Page 44

THE THERMAL FUSES

There are three thermal fuses in the OTR Microwave Oven. They are: the magnetron thermal fuse, the cavity thermal fuse, and the base thermal fuse. The magnetron and cavity

The base thermal fuse is located directly behind the control panel. It is a normally-open fuse that, when closed, activates the blower

motor at a low speed. thermal fuses are located inside the highvoltage section of the oven. These two thermal fuses are normally-closed, and will open

POSSIBLE CUSTOMER COMPLAINT:

The unit turns on by itself.

at a set temperature to disable the oven. Both of these fuses are resettable.

Magnetron Thermal Fuse Opens @ 228˚F/109˚C Resets @ 140˚F/60˚C

Cavity Thermal Fuse Opens @ 230˚F/110˚C Resets @ 140˚F/60˚C

Base Thermal Fuse Closes @ 133˚F/56˚C Resets @ 104˚F/40˚C

MAGNETRON

CAVITY

THERMAL

FUSE

THERMAL FUSE

3-4

BASE

THERMAL FUSE

Page 45

Cooking Products Service Manual Original March, 1997 4322167

THE BLOWER MOTOR CAPACITOR

Page 3-5

The blower motor capacitor is located below the air duct at the indicated location. It is in use any time the blower (vent) motor is oper-

AIR DUCT

BLOWER MOTOR

CAPACITOR

ating. The capacitor helps to maintain a constant voltage to the blower motor so that it runs more efficiently.

TESTING

1. Set the ohmmeter to the

R x 10K

scale.

2. Measure across the capacitor terminals.

The ohmmeter should indicate several ohms, then gradually return to infinity.

3-5

Page 46

THE GAS SENSOR

The gas sensor is used during the “Sensor Cook” operation of the oven. It is located above the oven and is mounted on the left side of the sensor cover. The sensor consists of two circuits housed on a small microcomputer board that is supplied with a current to keep it heated. The sensor heat conductivity will vary,

depending upon the humidity of the oven.

Changing humidity conditions, due to the cook-

ing process within the oven cavity, causes a

difference in potential between these two cir-

cuits. This difference is monitored by the mi-

crocomputer during cooking, allowing the mi-

crocomputer to determine the proper cook

time.

NOTE: Always verify that the sensor cover is

not obstructed (proper air flow is passing over

the sensor), and that the fan motor is working

properly, before replacing the gas sensor.

TESTING

SENSOR

COVER

MOUNTING

SCREW

SENSOR

GAS

BOARD

1. Set the ohmmeter to the

R x 1

scale.

2. Remove the 3-pin connector from the control circuit board and measure the resistance between the:

a)Red & white wire terminals.

You should measure 20 Ω @

RED

WHT

YEL

68˚F.

b)White & yellow wire terminals.

You should measure infinity.

3-6

Page 47

THE CONVECTION THERMISTOR

The convection thermistor is located under the circulation pulley cover and is used during the convection operation of the oven. When the temperature increases, the resistance of the thermistor decreases. The thermistor resistance is monitored by the microcomputer. As the oven temperature rises and falls, the

TESTING

Cooking Products Service Manual Original March, 1997 4322167

Page 3-7

thermistor signal going back to the microcomputer causes the heater relay to open and close, and cycles the heating element on and off.

NOTE: Verify that the heating element is working correctly before replacing a thermistor.

1. Set the ohmmeter to the

R x 10K

scale.

2. Remove the 6-pin connector from the control circuit board and measure across terminals 5 & 6.

You should measure 155 kΩ to 350 kΩ @ 68˚F.

BRACKETS

PHILLIPS

SENSOR

COVER

SCREW

CIRCULATION

PULLEY COVER

CONVECTION THERMISTOR

3-7

Page 48

THE CONVECTION HEATING ELEMENT

The 1400-watt convection heating element is located under the circulation pulley cover and the top plate. The heating element heats the air that is distributed into the oven cavity by the convection fan. It operates on 120 VAC and is controlled by the convection thermistor,

UNCLIP

ELEMENT

HERE

HEATING ELEMENT

VIEWED FROM UNDER

TOP PLATE

BRACKETS

and the heater relay on the microcomputer board. During a convection, or combination cooking cycle, the heater cycles on and off to maintain the programmed cavity temperature. The heating element surrounds the convection fan blade and is not visible through the oven cavity.

HEATING ELEMENT

MOUNTING SCREWS

CIRCULATION

PULLEY COVER

CONVECTION THERMISTOR

SENSOR

COVER

TESTING

1. Set the ohmmeter to the

R x 1

scale.

2. Measure across the heating element terminals.

You should measure between 40 Ω and 90 Ω @ 68˚F.

TOP PLATE

CONVECTION

HEATING

ELEMENT

YELLOW

WIRES

3-8

Page 49

MOTORS

Cooking Products Service Manual Original March, 1997 4322167

Page 3-9

Blower Motor

—Removes smoke and odors from the kitchen

cooking area through outside venting or recirculation.

Fan Motor

—Cools the magnetron and circulates air through the

oven during microwave cooking.

Stirrer and Turntable Motors

—Distribute microwave energy

evenly during microwave cooking.

STIRRER MOTOR

TURNTABLE

MOTOR

BLOWER MOTOR

FAN MOTOR

3-9

Page 50

PROGRAMMING CHECKS

TOUCH PANEL CONTINUITY TEST

1. Unplug the microwave oven’s power sup-

ply cord.

2. Open the oven door.

3. Plug the power cord back into the AC

receptical. You should see the following display if any of the interlock switches are closed:

– f 2 –

If the sensor is defective, or if the wires are not properly connected, you will see the following display:

– f 1 –

3-10

Page 51

CHARTS

Cooking Products Service Manual Original March, 1997 4322167

Page 3-11

PROBLEM POSSIBLE CAUSE

Line fuse blows when power cord is plugged into a wall receptacle.

Oven will not operate.

Shorted wire in power cord, wiring harness, or overload circuit.

1. No power at wall plug. 1. Check fuse or breaker

2. Open wire in power cord or wiring harness.

3. Control board.

4. Line fuse.

5. Thermal fuses.

Oven cavity light will not turn on.

1. Bulb is burned out.

2. Lamp socket.

3. Oven lamp switch.

4. Open wiring between the above components.

5. Control board.

TEST PROCEDURE OR CORRECTION

1. Check wiring with ohmmeter for continuity.

2. Use separate 15- to 20ampere circuit.

box.

2. Check wiring with ohmmeter for continuity.

3. Check board.

4. Check fuse.

5. Check fuses.

1. Replace bulb.

2. Check lamp socket.

3. Check control board.

4. Repair open wire.

5. Check control board.

Oven will not go into “Cook” cycle when the door is closed.

Oven goes into “Cook” cycle, but does not complete the cycle. Heat is produced in the oven load.

1. Control board.

2. Line fuse and/or thermal fuses.

3. Interlock switches.

4. Open wiring between the above components.

1. Control board.

2. Low line voltage (should be at least 108-volts AC).

3. Thermal fuse.

4. Thermal fuse on magnetron.

5. Circuit is overloaded.

1. Check control board.

2. Check line fuse and/or thermal fuses.

3. Check interlockswitches.

4. Repair open wire.

1. Check control board.

2. Use separate 15- to 20ampere circuit.

3. Check thermal fuse.

4. Check thermal fuse on magnetron.

5. Use separate 15- to 20ampere circuit.

3-11

Page 52

PROBLEM

POSSIBLE CAUSE

TEST PROCEDURE OR CORRECTION

Little or no heat is produced in the oven load.

Oven fuse blows when the door is opened.

Oven lamp goes on with the door open, but the light goes out when the door is closed with the control on.

The power source fuse blows when the door starts to open.

1. High voltage transformer.

2. Rectifier diode.

3. High voltage capacitor.

4. Magnetron.

5. Power selector.

1. Primary interlock switch. 1. Check primary interlock

2. Shorted wire harness.

1. Secondary interlock. 1. Check secondary inter-

1. High voltage transformer.

2. Secondary circuit of the high voltage transformer is shorted.

3. High voltage capacitor is shorted.

4. Shorted wiring between the above components.

1. Check the high voltage transformer.

2. Check the high voltage rectifier diode.

3. Check the high voltage capacitor.

4. Check the magnetron.

5. Check the power selector.

switch.

2. Repair wiring.

lock.

1. Check the high voltage transformer.

2. Check the high voltage transformer.

3. Check the high voltage capacitor.

4. Use an ohmmeter to check continuity, and repair wiring.

5. Check blower motor.5. Blower motor.

Fan motor will not operate. 1. Check fan motor.

1. Fan motor.

2. Open or loose wiring in circuit to fan motor.

3-12

2. Use ohmmeter to check continuity, and repair wiring.

Page 53

Cooking Products Service Manual Original March, 1997 4322167

Page 3-13

PROBLEM

Blower motor will not operate.

POSSIBLE CAUSE

1. Blower motor.

2. Control board.

3. Open or loose wiring in circuit to blower motor.

Cooktop lamps do not come on.

1. Bulb burned out.

2. Control board.

3. Lamp sockets.

4. Open wiring between the above components.

Oven heats too fast. 1. Line voltage is too high

(should be between 108and 132-volts AC).

2. Control board.

TEST PROCEDURE OR CORRECTION

1. Check blower motor.

2. Check control board.

3. Use ohmmeter to check continuity, and repair wiring.

1. Check bulb.

2. Check control board.

3. Check lamp sockets.

4. Use ohmmeter to check continuity, and repair wiring.

1. Use separate 15- to 20ampere circuit.

2. Check control board.

Oven cooks too slowly.

Speaker does not sound at conclusion of cooking sequences, or after elapsed time in Minute Timer.

Oven cooks on “HIGH” when a lower cook power is selected.

Oven runs but will not cook.

1. Line voltage is too low (should be between 108and 132-volts AC).

2. User error.

3. Magnetron.

1. Open connection or failed speaker.

2. Tones are programmed out.

1. Shorted relay.

2. Control board.

1. Secondary interlock switch.

2. Relay 2 is open.

3. High voltage components.

1. Use separate 15- to 20ampere circuit.

2. Instruct user regarding

proper cooking times.

3. Check magnetron.

1. Replace board.

2. Program tones back in. (Touch and hold key #1 for 4-seconds).

1. Check the control board.

2. Check control board.

1. Check secondary interlock switch.

2. Check control board.

3. Check high voltage components.

3-13

Page 54

PROBLEM

POSSIBLE CAUSE

TEST PROCEDURE OR CORRECTION

Console will not display data, or has incorrect data.

Erratic console display during operation.

Display continues to count down when door is open during a “Cook” cycle.

1. No power at wall plug.

2. Open line fuse.

3. Thermal fuse.

4. Thermal fuse on magnetron.

5. Interlock safety switches.

6. Control board.

1. Magnetron. 1. Check magnetron.

1. Secondary interlock switch.

2. Control board.

1. Check fuse or breaker box.

2. Replace line fuse.

3. Check thermal fuse.

4. Check magnetron thermal fuse.

5. Check interlock safety switches. Replace, if defective.

6. Check control board.

1. Check secondary interlock switch. Replace, if defective.

2. Check control board.

Oven operates without a “Start” command.

1. Defective control board.

CHECKING THE MICROWAVE POWER OUTPUT

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.

1. Replace control board.

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 2the water should start to boil. If more than 3-minutes is required, it could mean that the operating voltage is low, (below 110volts), or it is not functioning properly and may need to be checked by a qualified technician.

/2 to 3-minutes,

3-14

Page 55

Cooking Products Service Manual Original March, 1997 4322167

CHECKING FOR MICROWAVE ENERGY LEAKAGE

When checking for R.F. Ieakage, use an ap-

CAUTION

On every service call, checks for microwave energy emission must be made according to the following manner.

1. Remove the cooking rack from the oven cavity, if the microwave oven is so equipped.

2. Place a 275 ML (9. oz.) glass of water in the center of the oven bottom.

3. Select “HlGH” cook power, turn the microwave oven on, and test for R.F. Ieakage using the following pattern:

a)Check around the cabinet at the front. b)Check around the door. c) Check across the console panel. d)Check horizontally across the door e)Check vertically across the door. f) Check diagonally across the door. g)Check across the air vents. h)Check across the rear air vent.

NOTE: The scan speed is one-inch-per-second.

proved R.F. measuring device to assure less than 4 mw/cm a maximum scan rate of 2.5 cm/second, in compliance with U.S. Government Department of Health, Education and Welfare 21 CFR1030, performance Standard for Microwave Ovens.

A properly operating door and seal assembly will normally register small emissions, but they must be no greater than 4 mw/cm measurement uncertainty.

NOTE: Enter leakage readings in the space BEFORE and AFTER on the service document.

All microwave ovens exceeding the emission level of 4 mw/cm Service for microwave ovens immediately and the owner should be told not to use the microwave oven until it has been repaired completely.

If a microwave oven is found to operate with the door open, report to Dept. of Service, the manufacturer, and CDRH* immediately. Also tell the owner not to use the oven.

The interlock monitor switch acts as the final safety switch protecting the customer from microwave radiation. If the interlock monitor switch operates and opens the line fuse, the interlock switches have failed, and you must replace all of them (primary and secondary interlock switches, and the monitor switch), because their contacts may be melted and welded together.

emission at 5 cm distance with

must be reported to Dept. of

Page 3-15

to allow for

EQUIPMENT

• Electromagnetic energy leakage monitor

(NARDA 8100B, HOLADAY H1501).

• 6100 cc glass beaker.

• Glass thermometer 100˚C or 212˚F.

All repairs must be performed so that microwave energy emissions are minimal.

* CDRH: Center for Device and Radiological health, food, and drug administration.

3-15

Page 56

MAKING THE MEASUREMENTS

Measuring The Oven With The Cabinet Installed

MEASUREMENT NOTES:

• When measuring for leakage, use the 2 (5 cm ) spacer that is provided with the probe.

• Leakage with the outer panels removed should be less than 5 mW/cm.sq

• Leakage for a fully assembled oven (before the lamp switch primary is interrupted) with the door opened slightly, should be less

2 mW/cm.sq

than

• Do not exceed the meter’s full-scale deflection.

• Do not move the test probe along the measuring surfaces faster than 1-inch-per-second (2.5 cm/sec), otherwise a false reading will occur.

• When testing near a corner of the door, keep the probe perpendicular to the surface, and move it horizontally without touching the surfaces, otherwise a false reading will occur.

• Hold the test probe by its gripping surface only, otherwise a false reading will occur.

To measure for oven leakage:

1. Pour 275 (±25cc) of water into a 600 cc graduated beaker.

2. Place the beaker into the center of the microwave oven.

3. Set the energy leakage monitor to 2,450 MHz, and use it according to the manufacturer’s recommended test procedure to obtain the correct results.

4. Measure the microwave radiation with an electromagnetic radiation monitor. Hold the probe perpendicular to the surface being measured, and measure around the door viewing window, the exhaust opening, and air inlet openings.

5. Operate the oven at its maximum energy output, and take the measurements.

Measuring The Oven With The Cabinet Removed

When the magnetron has been replaced, use the previous procedure, and measure for microwave energy leakage after all of the necessary components are replaced or adjusted,

before the cabinet is installed. Take spe-

and cial care to measure around the magnetron and the waveguide.

WARNING:

not to contact any of the high voltage components when making measurements with the cabinet removed.

Be careful

3-16

Page 57

Cooking Products Service Manual Original March, 1997 4322167

Page 3-17

MEASURING MICROWAVE POWER OUTPUT USING THE IEC-705 RATING STANDARD

When determining the microwave oven’s power output using the IEC-705 rating standard, the following conditions must be met:

• When making microwave power output measurements, the oven is supplied with its rated line voltage, and operated at its maximum power output setting with a load of 1000 (±5) cc of potable water.

• The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of diameter of approximately 7.6

• The oven and the empty vessel are at ambient temperature prior to the start of the test.

• The initial temperature of the water is 10˚C ±2˚ (50˚F). It is measured immediately be- fore the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest position, and the microwave power switched on.

/8" and an outside

• The time (in seconds) for the temperature of the water to rise by a value of 10˚C ±2˚ is measured. The initial and final water temperatures are selected so that the maximum difference between the final water temperature, and the ambient temperature, is 5˚C.

• The microwave power output (in watts) is calculated, using the following formula:

(L) 4187 (∆T)

P =

L = time (in seconds). P = microwave output power. (∆ T) = temperature rise.

• Microwave power output is measured with the oven operating at full power. The magnetron filament heat-up time (approximately 2-seconds) is not included.

• The water is stirred to equalize the temperature throughout the vessel, prior to measuring the final water temperature.

• Stirring devices and measuring instruments are selected to minimize the addition or removal of heat.

3-17

Page 58

COMPONENT TESTING

FILAMENT WINDING

WARNING

ELECTRICAL SHOCK HAZARD

DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHEN REMOVING THE CABINET FROM THE OVEN. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR, AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.

TEST CHARTS

TEST PROCEDURE RESULTCOMPONENT

High-Voltage Transformer (with wire leads unplugged).

1. Set the ohmmeter to the

R x 1

the:

a) Primary winding. b) Secondary to ground. c) Filament winding.

SECONDARY

WINDING

scale, and measure

HIGH VOLTAGE

TRANSFORMER

PRIMARY WINDING

a) 0.3 to 0.5 ohms. b) 65 to 120 ohms. c) 0.2 to 0.4 ohms

Magnetron (with wire leads unplugged). NOTE: A microwave energy leakage test must always be performed when the oven is serviced for any reason.

NOTE: Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat a load.

2. Set the ohmmeter to its

R x 1000

sure the:

a) Primary to ground. b) Filament to ground.

1. Set the ohmmeter to the

R x 1

the:

a) Filament terminal.

2. Set the ommeter to the

R x 1000

sure the: a) Filament winding to

chassis.

scale, and mea-

scale, and measure

scale and mea-

a) Normal = infinity. b) Normal = infinity.

a) Normal readings - Less

than 1 ohm.

a) Normal = infinity.

3-18

Page 59

Cooking Products Service Manual Original March, 1997 4322167

Page 3-19

TEST PROCEDURE RESULTCOMPONENT

High-Voltage Capacitor a) Normal - The meter indi-

Terminal-To-Terminal

Set the ohmmeter to the

R x 10 k

scale, and measure the resistance across the capacitor terminals.

cates several ohms, then gradually returns to infinity.

b) Abnormal - The meter

indicates infinity, or zero

CAPACITOR

ohms (a short) immediately.

Blower Motor Capacitor

Terminal-To-Case

Set the ohmmeter to the

R x 1

scale, and measure the resistance between each terminal and the case.

Terminal-To-Terminal

Set the ohmmeter to the

R x 10 k

scale, and measure the resistance across the capacitor terminals.

a) Normal - The meter indi-

cates infinity.

b) Abnormal - The meter

indicates zero ohms, or a short.

a) Normal - The meter indi-

cates several ohms, then gradually returns to infinity.

b) Abnormal - The meter

indicates infinity, or zero ohms (a short) immediately.

High-Voltage Rectifier

RECTIFIER

DIODE

ANODE

CATHODE

Forward Continuity

Set the ohmmeter to the

R x 1

scale, and measure the forward resistance across the rectifier terminals with the (+) lead touching the anode and the (–) lead touching the cathode.

Reverse Continuity

Set the ohmmeter to its highest scale, and measure the reverse resistance across the rectifier terminals with the (+) lead touching the cathode and the (–) lead touching the anode.

a) Normal - The meter indi-

cates several ohms.

b) Abnormal - The meter

indicates infinity, or zero ohms (a short).

a) Normal - The meter indi-

cates infinity.

b) Abnormal - The meter

indicates infinity, or zero ohms (a short).

3-19

Page 60

TEST PROCEDURE RESULTCOMPONENT

Switches (with wire leads removed). All of the switches are measured in the same manner.

N.C. CONTACTS

N.O. CONTACTS

Temperature Probe

N.O. and C Terminals

Set the ohmmeter to the scale, and measure the resistance between the normally-open (N.O.) and the common (C) terminals of the switch.

N.C. and C Terminals

Set the ohmmeter to the scale, and measure the resistance between the normally-closed (N.C.) and the common (C) terminals of the switch.

Set the ohmmeter to the scale, and measure the temperature probe with the leads positioned at either terminal.

R x 1

R x 10 k

a) Normal - The meter indi-

cates infinity.

b) Abnormal - The meter

indicates zero ohms (a short).

a) Normal - The meter indi-

cates continuity, or zero ohms.

b) Abnormal - The meter

indicates infinity.

Ambient Resistance Temp. (˚F) Value

60 75.24 kΩ (±11 kΩ)

68 62.57 kΩ (±8 kΩ)

70 59.79 kΩ (±8 kΩ)

80 45.80 kΩ (±7 kΩ)

90 36.94 kΩ (±6 kΩ)

Fan Motor (with leads disconnected).

Blower Motor (with leads disconnected)

Stirrer & Turntable Motors (with leads disconnected)

Set the ohmmeter to the scale, and measure across the terminals.

Set the ohmmeter to the scale, and measure the:

a) High speed windings (blue and black wires).

b) Low speed windings (blue and white wires).

Set the ohmmeter to the scale, and measure the resistance between the motor terminals.

R x 1

a) Fan Motor - Normal = 130

to 155 ohms.

a) Normal - High speed: 25

to 45 ohms.

b) Normal - Low speed: 45

to 65 ohms.

a) Normal - 1 to 4 ohms.

b) Abnormal - Infinite or

zero ohms.

3-20

Page 61

Cooking Products Service Manual Original March, 1997 4322167

Page 3-21

TEST PROCEDURE RESULTCOMPONENT

Convection Thermistor

Convection Heating Element (with leads disconnected)

Gas Sensor

Set the ohmmeter to the

R x 10 K

scale.

Remove the 6-pin connector from the circuit board and measure across terminals 5 & 6.

Set the ohmmeter to the

R x 1

scale, and measure across the terminals.

Set the ohmmeter to the

R x 1

scale.

Remove the 3-pin connector from the circuit board and measure the resistance between:

a) Red & white wire terminals.

b) White & yellow wire terminals.

a) Normal = 155 K to 350 K

ohms @ 68˚F.

b) Abnormal = Infinity, or

zero ohms (a short).

a) Normal = 9 to 40 ohms @

68˚F ± 2˚.

b) Abnormal = Infinity, or

zero ohms (a short).

a) 20 ohms @ 68˚F ±2˚.

b) Infinite.

3-21

Page 62

TEST PROCEDURE RESULTCOMPONENT

Touch Keyboard (see below). Measure the resistance between

the terminal pins of the keypad (shown below) that you wish to

FPC CONNECTOR

(TOP)

check.

For example: To measure the

“CLOCK” keypad, refer to the il-

lustration, and:

3 4

1.Find the first terminal number

5 6 7

9 10 11 12 13

along the top bar (pin 5).

2.Find the second terminal number in the side bar (pin 8).

3.Set the ohmmeter to the scale.

a) Touch the ohmmeter leads

R x 1

between pins 5 and 8 on the ends of the FPC connector. b) Press the CLOCK keypad.

Normal Reading:

100 Ω resistance.

TURNTABLE

FROZEN ENTREE

KEYBOARD MATRIX

LIGHT

FAN

BEVERAGE

POPCORN

BAKED

POTATO

REHEAT

VEGETABLE

DEFROST

WARM

HOLD

COOK

CLOCK

TIMER

SET

TIMER

OFF

ADD

MINUTE

COOK

TIME

COOK

POWER

CANCEL

START ENTER

OFF

3-22

Page 63

Cooking Products Service Manual Original March, 1997 4322167

Page 3-23

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 relay. Make sure that you do not allow the clips to short to anything.

3.Plug the microwave oven into an AC receptical.

4.Set the power level, as shown in the chart in the right column, and check the relay operation for the ten power levels. NOTE: During the operating time set for each level, the relay will close (short) for the time specified in the chart, and then open for another specified amount of time. When the open time elapses, the cycle begins again until the cooking time elapses and the oven turns off.

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

∞

CLOSED

∞ 00

OPEN

CONTROL CIRCUIT BOARD CHECK LIST

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 replacement relay installed.

3. Proper temperature measurements cannot 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.

3-23

Page 64

PRIMARY, MONITOR, & SECONDARY SWITCH

CHECKOUT PROCEDURE

NOTE: The following chart and strip circuits show the continuity and position of the door switches when the microwave oven door is open and closed.

CONTINUITY TEST CHART

SWITCH TESTING

Primary

Interlock

Secondary

Interlock

Monitor

DOOR OPEN

Disconnect the 3-pin connector CN3 from the control module. Check from the pink wire (pin 1) to the blue wire (pin 3).

Disconnect the wires at the Secondary Interlock Switch. Check from the common terminal (white wires) to the normally-open terminal (white wires).

Disconnect the wires from the Monitor Switch. Check from the common terminal (white wires) to the normally-closed terminal (red wire).

DOOR

OPEN

–+

+–

(+) = CONTINUITY (–) = NO CONTINUITY

DOOR

CLOSED

SECONDARY

INTERLOCK

SWITCH

DOOR CLOSED

SECONDARY

INTERLOCK

SWITCH

MONITOR

SWITCH

MONITOR

SWITCH

3-24

PRIMARY

INTERLOCK

SWITCH

PRIMARY

INTERLOCK

SWITCH

Page 65

TECH TIPS

Models MH7130XE & MH7135XE

MICROCOMPUTER

BOARD

RELAY 2

LOW-VOLTAGE

TRANSFORMER

VR1

WIRING DIAGRAMS

20A LINE

FUSE

BKBK

MAGNETRON

THERMAL

FUSE

(109˚C/228˚F)

CAVITY

THERMAL

FUSE

(110˚C/230˚F)

Cooking Products Service Manual Original March, 1997 4322167

BK W

3 2 1

BLOWER (VENT)

LOW

1 2 3 1 2 3

MOTOR

4 5 4

3 2 1

6 65

Page 4-1

RELAY 1

RELAY 3

RELAY 4

RELAY 5

PH 1

CN5

123 123

TURNTABLE

LED

BOARD

VR 2

CN2

(N.O.) (C.)

PRIMARY

INTERLOCK

SWITCH

CONTROL MODULE

CN1 CN2 CN4 CN5

1357911 13

PKRD BLBR YLBK BK

CN1

BLPK

6 mF CAP

OVEN LIGHT

BASE

THERMAL

FUSE

PRIMARY

INTERLOCK

SWITCH

WRD

SENSOR T.T. LED

RECTIFIER

STIRRER

MOTOR

COOKTOP LIGHTS

BK BK

MOTOR

MONITOR

SWITCH

(C)

(NC)

HIGH-VOLTAGE

CAPACITOR

1 1 2 2

FAN

2 2 11

HIGH-VOLTAGE

TRANSFORMER

TURNTABLE

MOTOR

MAGNETRON

(C)

SECONDARY

(NO)

INTERLOCK

SWITCH

NOTES:

1. Oven is Off.

2. Door is Open.

BK = Black BR = Brown RD = Red YL = Yellow GN = Green BL = Blue PK = Pink WH = White

4-1

Page 66

Model MH9115XE

MICROCOMPUTER

RELAY #2

LOW-VOLTAGE

TRANSFORMER

RELAY #1

RELAY #3

RELAY #4

RELAY #5

RELAY #6

BOARD

MAGNETRON

THERMAL

PROTECTOR

BASE

THERMAL

PROTECTOR

CAVITY

THERMAL

PROTECTOR

BLOWER

MOTOR

(LOW)

15A LINE

FUSE

(C)

(HI)

(NC)

(NO)

COOKTOP LIGHTS

(C)

OVEN LIGHT

FAN

MOTOR

TURNTABLE

MOTOR

MONITOR

SWITCH

(NC)

(C)

SECONDARY

INTERLOCK

(NO)

SWITCH

234

TEMP

PROBE

PRIMARY

INTERLOCK

SWITCH

CONTROL MODULE

PK RD BL BR YL BKW

12 34567

8-PIN CONNECTOR

12 34 12 3

4-PIN CONNECTOR

BL BR

3-PIN CONNECTOR

NOTES:

1. Oven is Off.

2. Door is Open.

HIGH-VOLTAGE

CAPACITOR

RECTIFIER

TRANSFORMER

MAGNETRON

BK = Black BR = Brown RD = Red YL = Yellow GN = Green BL = Blue PK = Pink WH = White

4-2

Page 67

Cooking Products Service Manual

20A LINE

FUSE

CAVITY

THERMAL

FUSE

MAGNETRON

THERMAL

FUSE

RDBK

RELAY 4

PK/W

LOW-VOLTAGE

TRANSFORMER

BLOWER MOTOR

RELAY 3

MICROCOMPUTER

BOARD

3 1

CAPACITOR

YRD

(LOW)

(C)

Original March, 1997 4322167

STRIP CIRCUITS

1. UNIT IS PLUGGED IN — CLOCK IS WORKING

Page 4-3

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

BK W

2. DOOR IS OPEN — OVEN LIGHT IS ON

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

3 1

MICROCOMPUTER

LOW-VOLTAGE

TRANSFORMER

MICROCOMPUTER

BOARD

LOW-VOLTAGE

TRANSFORMER

BOARD

OVEN LIGHT

3. BLOWER MOTOR IS ON “LOW”

4-3

RELAY 1

BR/RD/BK

W/BL

Page 68

4. BLOWER MOTOR IS ON “HIGH”

MICROCOMPUTER

BOARD

LOW-VOLTAGE

TRANSFORMER

RELAY 4

(HIGH) (C)

BLOWER MOTOR

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

3 1

5. OVEN IS OFF — CAVITY TEMPERATURE IS ABOVE 133˚F BLOWER MOTOR IS ON “LOW”

MICROCOMPUTER

BOARD

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

LOW-VOLTAGE

TRANSFORMER

3 1

RELAY 4

BASE

THERMAL

FUSE

CAPACITOR

BLOWER

MOTOR

YRD

(C)(HIGH)

6. COOKTOP LIGHTS ARE ON “HIGH” OR “LOW”

MICROCOMPUTER

BOARD

LOW-VOLTAGE

TRANSFORMER

PH1

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

4-4

BL/BK

COOKTOP LIGHTS

Page 69

7. MICROWAVE COOKING IS ON

Cooking Products Service Manual Original March, 1997 4322167

Page 4-5

20A LINE

FUSE

MAGNETRON

THERMAL

FUSE

CAVITY

THERMAL

FUSE

MICROCOMPUTER

LOW-VOLTAGE

TRANSFORMER

BOARD

RELAY 1

RELAY 5

RELAY 2

STIRRER

MOTOR

TURNTABLE MOTOR

SECTION

OVEN LAMP

FAN

MOTOR

W/BL

SWITCH

SECONDARY

8. CONVECTION COOKING IS ON

MICROCOMPUTER

15A LINE

FUSE

CAVITY

THERMAL

FUSE

MAGNETRON

THERMAL

FUSE

BOARD

LOW-VOLTAGE

TRANSFORMER

RELAY #1

RELAY #7

RELAY #9

OVEN LIGHT

SWITCH

N.O.

RD BR

CIRCULATION

MOTOR

TOWER MOTOR

CONVECTION

HEATER

OVEN LIGHT

SECONDARY

INTERLOCK

SWITCH

4-5

Page 70

SPECIFICATIONS

Rated Power Consumption ...................... 1500-watts, maximum (microwave oven only).

1750-watts, maximum (microwave oven, cooktop lamps, ventilation fan).

Microwave Output...................................... 850-watts (IEC 705 Test Procedure).

Adjustable 85-watts through 850-watts in 10-steps.

Frequency ................................................... 2450 MHz ±50 MHz.

Power Supply ............................................. 120-volts ±12-volts AC, 60 Hz.

Rated Current............................................. 13-amperes (microwave oven only).

15-amperes (microwave oven, cooktop lamps, ventilation fan).

Magnetron Cooling .................................... Forced air.

Microwave Stirring..................................... Stirring fan disk.

Rectification ............................................... Rectification voltage doubler, half-wave.

Door Sealing .............................................. Choke System.

Safety Devices:

Magnetron Thermal Fuse...................... Opens @ 228˚F/109˚C, resets @ 140˚F/60˚C.

Cavity Thermal Fuse ............................. Opens @ 230˚F/110˚C, resets @ 140˚F/60˚C.

Base Thermal Fuse ............................... Closes @ 133˚F/56˚C, resets @ 104˚F/40˚C.

Line Fuse ................................................ 15-ampere.

Door Interlock Switches ........................ Primary Interlock Switch.

Secondary Interlock Switch. Interlock Monitor.

Magnetron Type......................................... 2M214.

High Voltage Capacitor............................. 0.91 µFd, 2.1 kV AC.

High Voltage Diode ................................... 350 mA, 9.0 kV.

Cooktop Lamp ............................................ 120-volts, 30-watts.

Cavity Lamp ............................................... 125-volts, 30-watts.

Timer ........................................................... Digital, up to 99 minutes, 99 seconds

(in each cooking stage).

Tray ............................................................. Ceramic plate.

4-6

Page 71

Cooking Products Service Manual Original March, 1997 4322167

Page 4-7

SPECIFICATION CHARTS

MODEL NUMBER MH7130XEQ MH7130XEZ MH7135XEB

CONTROL SYSTEM:

Timer: Yes Yes Yes

Type Electronic Electronic Electronic

Limits 99 Min. - 99 Sec. 99 Min. - 99 Sec. 99 Min. - 99 Sec.

Scale Linear (Digital) Linear (Digital) Linear (Digital)

Operation 30 Touch Pads 30 Touch Pads 30 Touch Pads

Display

Microwave Cooking Cycles:

Cook Time Yes Yes Yes

Auto Cook Yes, Non-Sensored Three Catagory Yes, Non-Sensored Three Catagory Yes, Non-Sensored Three Catagory

Auto Defrost (Non-Sensored) Yes - Three Category By Weight Yes - Three Category By Weight Yes - Three Category By Weight

Popcorn Yes, Non-Sensored Three Settings Yes, Non-Sensored Three Settings Yes - Sensored

Baked Potato Yes, Non-Sensored - Four Settings Yes, Non-Sensored - Four Settings Yes - Sensored

Reheat Yes, Non-Sensored - Five Catagory Yes, Non-Sensored - Five Catagory Yes - Sensored -Three Category

Beverage Yes, Non-Sensored - Two Settings Yes, Non-Sensored - Two Settings No

Frozen Entree Yes, Two Settings Yes, Two Settings Yes, Sensor Cook

Vegetable Yes, Non-Sensored Three Catagory Yes, Non-Sensored Three Catagory Yes, Sensored - Three Catagory

Auto Roast No No No

Warm Hold 5% Power - 99 Min., 99 Sec. Max 5% Power - 99 Min., 99 Sec. Max 5% Power - 99 Min., 99 Sec. Max

Add Minute Yes Yes Yes

Probe Temp No No No

Personal Choice No No Yes

Convection Cooking Cycles:

Convection Bake No No No

Convection Broil No No No

Combination Cooking Cycles:

Combination Bake No No No

Combination Roast No No No

Other Hidden Features:

Stoppable Turntable - 12-3/4" Diameter Yes Yes Yes

LED Indicator On Turntable TouchPad Yes - Red Yes - Red Yes - Red

Pause Door Open Door Open Door Open

Clock Yes Yes Yes

Independent Minute Timer Yes Yes Yes

Time Set Yes Yes Yes

Timer Off Yes Yes Yes

Auto Start No No No

Stage Cooking

In-Use Reprogramming Yes Yes Yes

More/Less Function Yes Yes Yes

Sales Demonstration Mode Yes Yes Yes

Child Lock Yes Yes Yes

Start/Enter Yes Yes Yes

Off/Cancel Yes Yes Yes

Variable Power: Yes Yes Yes

Type Electronic Electronic Electronic

Range 0% - 100% 0% - 100% 0% - 100%

Scale Digital Digital Digital

5-Digit - Blue- Green

Fluorescent - Callouts In Display

Yes (4) - Cook I, II, Defrost

Warm Hold

5-Digit - Blue- Green

Fluorescent - Callouts In Display

Yes (4) - Cook I, II, Defrost

Warm Hold

5-Digit - Blue- Green

Fluorescent - Callouts In Display

Yes (4) - Cook I, II, Defrost

Warm Hold

4-7

Page 72

MODEL NUMBER MH7130XEQ MH7130XEZ MH7135XEB

Temperature Sensor Probe: No No No

Type No No No

Range No No No

Scale No No No

Levels No No No

Operation No No No

Timed Override No No No

Exhaust Fan: Yes Yes Yes

High Yes Yes Yes

Low Yes Yes Yes

Manual Off Yes Yes Yes

Auto Off Yes Yes Yes

Note Automatic Turn On At 133˚F/56˚C. Automatic Turn On At 133˚F/56˚C. Automatic Turn On At 133˚F/56˚C.

Cooktop Light: Yes Yes Yes

High Yes Yes Yes

Low Yes Yes Yes

Manual Off Yes Yes Yes

Auto Off Yes Yes Yes

Wattage 30 Watts 30 Watts 30 Watts

Light Cover Glass Glass Glass

Size of Cover 8" W x 3-1/2" H 8" W x 3-1/2" H 8" W x 3-1/2" H

Display Indicators:

Display Annunciators 10 - In Display 10 - In Display 14 - In Display

Display Words 46 - Spelled In Display 46 - Spelled In Display 49 - Spelled In Display

Microwave Cook Indication “COOK” Annunciator “COOK” Annunciator “COOK” Annunciator

Microwave Stage Indication No No "2" Annunciator Only

Microwave Defrost Indication “DEF” Annunciator “DEF” Annunciator “DEFR” Annunciator

Sensor Cook Indication No No “SENSOR” Annunciator

Convection Cook Indication No No No

Convection Preheat Indication No No No

Combination Cook Indication No No No

Auto Cycle Indication “AUTO” Annunciator “AUTO” Annunciator “AUTO” Annunciator

Auto Start Indication No No No

User Enter Indication “ENTER” Annunciator “ENTER” Annunciator “ENTER” Annunciator

Start Indication Flashing “START” Annunciator Flashing “START” Annunciator “START?” Annunciator

Probe Temp Indication No No No

Weight Indication “OZ” “OZ” “OZ”

Clock Set “CLOCK” & Colon Flashes “CLOCK” & Colon Flashes “CLOCK” & Colon Flashes

Independent Minute Timer “TIMER” Annunciator “TIMER” Annunciator “TIMER” Annunciator

End Of Cooking Reminder “END” “END” “END”

Power Failure Indication Yes - 88:88 Displayed Yes - 88:88 Displayed Yes - 888:88 Displayed

Technical Error Indication “F-” With Error Number “F-” With Error Number “F-” With Error Number

Diagnostic System Yes Yes Yes

Audible Signals: Yes Yes Yes

Type Resonator Resonator Resonator Programming Tone

(w/On/Off Function) Between Cycles (w/On/Off Function)

Yes - One Short Beep Yes - One Short Beep Yes - One Short Beep

Yes - Two Beeps Yes - Two Beeps Yes - Two Beeps

4-8

Page 73

Cooking Products Service Manual Original March, 1997 4322167

MODEL NUMBER MH7130XEQ MH7130XEZ MH7135XEB

OVEN INTERIOR FEATURES:

Size 19" W x 8-9/16" H x 14-5/8" D 19" W x 8-9/16" H x 14-5/8" D 19" W x 8-9/16" H x 14-5/8" D

Capacity 1.3 Cubic Feet 1.3 Cubic Feet 1.3 Cubic Feet

Finish Epoxy Powder Coat Epoxy Powder Coat Epoxy Powder Coat

Cooking Power 900 Watts (IEC-705 Rating) 900 Watts (IEC-705 Rating) 900 Watts (IEC-705 Rating)

Ventilation Forced Air Forced Air Forced Air

Shelf Spillguard Sealed-In Spillguard Sealed-In Spillguard Sealed-In

Bi-Level Rack Yes Yes Yes

Light

Turntable Roller Yes Yes Yes

Temperature Probe No No No

DOOR FEATURES:

Stamped Steel Yes - With Tempered Cover Yes - With Tempered Cover Yes - With Tempered Cover

Window Water Clear Glass Water Clear Glass Low - T Glass

Window Size 16-1/3" W x 5-5/12" H 17-1/3" W x 5-5/12" H 17-1/3" W x 5-5/12" H

Window Graphics White With Dots On Edge Almond With Dots On Edge None

Door Screen White Almond Black

Door Baffle None None None

Cooking Guide Label Yes Yes Yes

Door Swing Left Hand (Hinge Side) Left Hand (Hinge Side) Left Hand (Hinge Side)

Handle/Latch Textured, Pull to Open Textured, Pull to Open Textured, Pull to Open

Seals

Color White Almond Black

MICROWAVE SYSTEM:

Distribution Top Feed Top Feed Top Feed

Magnetron

SAFETY FEATURES:

Interlock

Thermal Protectors Two - 1 Magnetron & 1 Oven Cavity Two - 1 Magnetron & 1 Oven Cavity Two - 1 Magnetron & 1 Oven Cavity

VENTILATION SYSTEM:

Type Convertible Convertible Convertible

Duct Outlet Size 3-1/4" H x 10" W 3-1/4" H x 10" W 3-1/4" H x 10" W

Recirculation CFM 120 120 120

Vertical CFM (Hi/Low) 280/180 280/180 280/180

Horizontal CFM (Hi/Low) 300/200 300/200 300/200

Touch Control (2 Speed) Yes Yes Yes

Auto ON - Low Speed Yes - 133˚F/56˚C Yes - 133˚F/56˚C Yes - 133˚F/56˚C

Noise Level 55 dBA 55 dBA 55 dBA

Damper Yes Yes Yes

Grease Filter Yes (2) Yes (2) Yes (2)

Blower Type Twin Squirrel Cage Twin Squirrel Cage Twin Squirrel Cage

Shipped Vertical Vertical Vertical

Yes - Automatic - Turns on when

oven door is operating. 30-Watt

Extended Life (4000 Hours)

Three Stage

(Capacitive, Reflective & Absorbive)

Ceramic Dome, Horizontally

Cooled with Forced Air

Three Door/Latch Operated Switches (1 Power Interrupt,

1 Monitor, 1 Low Voltage)

Yes - Automatic - Turns on when

oven door is operating. 30-Watt

Extended Life (4000 Hours)

Three Stage

(Capacitive, Reflective & Absorbive)

Ceramic Dome, Horizontally

Cooled with Forced Air

Three Door/Latch Operated

Switches (1 Power Interrupt,

1 Monitor, 1 Low Voltage)

Yes - Automatic - Turns on when

oven door is operating. 30-Watt

Extended Life (4000 Hours)

(Capacitive, Reflective & Absorbive)

Ceramic Dome, Horizontally

Cooled with Forced Air

Three Door/Latch Operated

Switches (1 Power Interrupt,

1 Monitor, 1 Low Voltage)

Page 4-9

Three Stage

4-9

Page 74

MODEL NUMBER MH7130XEQ MH7130XEZ MH7135XEB

EXTERIOR FEATURES:

Outside Dimensions 29-15/16" W x 16-7/16" H x 15-3/8" D 29-15/16" W x 16-7/16" H x 15-3/8" D 29-15/16" W x 16-7/16" H x 15-3/8" D

Cabinet Finish White Textured Almond Textured Black Textured

Construction

Bottom Finish Painted Steel - Matte Gray Painted Steel - Matte Gray Painted Steel - Matte Black

Bottom Construction High Gauge Steel - No Embossments High Gauge Steel - No Embossments High Gauge Steel - No Embossments

Control and Door Frames One Piece Molded - White One Piece Molded - Almond One Piece Molded - Black

Cooktop Light w/Touch Control Two Lamps - 30 Watt Easy Access Two Lamps - 30 Watt Easy Access Two Lamps - 30 Watt Easy Access

Power Cord Length 4-feet 4-feet 4-feet

OTHER SPECIFICATIONS:

Electrical

Domestic Use Only Yes Yes Yes

Agency Approvals FCC, DHHS, U.L. Listed FCC, DHHS, U.L. Listed FCC, DHHS, U.L. Listed

Approximate Shipping Weight 64 lbs. 64 lbs. 64 lbs.

Approximate Net Weight 58 lbs. 58 lbs. 58 lbs.

APPROVED ACCESSORIES:

Filler Kit 4158439 4378403 4158311

Charcoal Filter Kit 4359416 4359416 4359416 (Included)

Exhaust Damper Assembly Yes (1 Set) Yes (1 Set) Yes (1 Set)

Hardware For Installation Yes (1 Set) Yes (1 Set) Yes (1 Set)

LITERATURE:

Use & Care Guide 4359337 4359337 4359338

Installation Instructions 4359330 4359330 4359330

Warranty In Use & Care In Use & Care In Use & Care

Cooking Guide In Use & Care In Use & Care In Use & Care

Cookbook with Hard Cover Accessory: 4358520 Accessory: 4358520 Accessory: 4358520

Carton Tag Std. - On Carton Corner Std. - On Carton Corner Std. - On Carton Corner

Tech Sheet 4359414 4359414 4359414

Service Manual 4322167 4322167 4322167

Unitized Chassis With

Wrapper & Mounting Plate

120V, Single Phase, 60 Hz, 1500 Watts

For Use With 15 or 20 Amp Circuit

Unitized Chassis With

Wrapper & Mounting Plate

120V, Single Phase, 60 Hz, 1500 Watts

For Use With 15 or 20 Amp Circuit

120V, Single Phase, 60 Hz, 1500 Watts

For Use With 15 or 20 Amp Circuit

Unitized Chassis With

Wrapper & Mounting Plate

4-10

Page 75

Cooking Products Service Manual Original March, 1997 4322167

MODEL NUMBER MH7135XEQ MH9115XEB MH9115XEQ

CONTROL SYSTEM:

Timer: Yes Yes Yes

Type Electronic Electronic Electronic

Limits 99 Min. - 99 Sec. 99 Min. - 99 Sec. 99 Min. - 99 Sec.

Scale Linear (Digital) Linear (Digital) Linear (Digital)

Operation 30 Touch Pads 37 Touch Pads 37 Touch Pads

Display

Microwave Cooking Cycles:

Cook Time Yes Yes Yes

Auto Cook Yes, Sensored Three Catagory No No

Auto Defrost (Non-Sensored) Yes - Three Category By Weight Yes - Three Category By Weight Yes - Three Category By Weight

Popcorn Yes - Sensored Yes - Sensored Yes - Sensored

Baked Potato Yes - Sensored No No

Reheat Yes - Sensored - Three Catagory Yes Yes

Beverage No No No

Frozen Entree Yes - Sensor Cook Yes - Sensor Cook Yes - Sensor Cook

Vegetable Yes- Sensored - Three Catagory No No

Auto Roast No Yes, Non-Sensored w/Probe 6 Category Yes, Non-Sensored w/Probe 6 Category

Warm Hold 5% Power - 99 Min., 99 Sec. Max 5% Power - 99 Min., 99 Sec. Max 5% Power - 99 Min., 99 Sec. Max

Add Minute Yes Yes Yes

Probe Temp No Yes Yes

Personal Choice Yes No No

Convection Cooking Cycles:

Convection Bake No Yes Yes

Convection Broil No Yes Yes

Combination Cooking Cycles:

Combination Bake No Yes Yes

Combination Roast No Yes Yes

Other Hidden Features:

Stoppable Turntable - 12-3/4" Diameter Yes No No

LED Indicator On Turntable TouchPad Yes - Red No No

Pause Door Open Door Open Door Open

Clock Yes Yes Yes

Independent Minute Timer Yes Yes Yes

Time Set Yes Yes Yes

Timer Off Yes Yes Yes

Auto Start No Yes - Auto Start; 11 Hr. 59 Min. Yes - Auto Start; 11 Hr. 59 Min.

Stage Cooking

In-Use Reprogramming Yes Yes Yes

More/Less Function Yes Yes Yes

Sales Demonstration Mode Yes Yes Yes

Child Lock Yes Yes Yes

Start/Enter Yes Yes Yes

Off/Cancel Yes Yes Yes

Variable Power: Yes Yes Yes

Type Electronic Electronic Electronic

Range 0% - 100% 0% - 100% 0% - 100%

Scale Digital Digital Digital

5-Digit - Blue- Green

Fluorescent - Callouts In Display

Yes (4) - Cook I, II, Defrost

Warm Hold

5-Digit - Blue- Green

Fluorescent - Callouts In Display

Yes (5) - Cook I, II, Defrost

Auto Start, Warm Hold

Fluorescent - Callouts In Display

Yes (5) - Cook I, II, Defrost

Auto Start, Warm Hold

Page 4-11

5-Digit - Blue- Green

4-11

Page 76

MODEL NUMBER MH7135XEQ MH9115XEB MH9115XEQ

Temperature Sensor Probe: No Yes Yes

Type No Electronic Electronic

Range No 90˚ F - 200˚F90˚ F - 200˚F

Scale No Digital Digital

Levels No 111 111

Operation No Direct Entry Direct Entry

Timed Override No 60 Min. If No Increase In Temp. Occurs 60 Min. If No Increase In Temp. Occurs

Exhaust Fan: Yes Yes Yes

High Yes Yes Yes

Low Yes Yes Yes

Manual Off Yes Yes Yes

Auto Off Yes Yes Yes

Note Automatic Turn On At 133˚F/56˚C. Automatic Turn On At 133˚F/56˚C. Automatic Turn On At 133˚F/56˚C.

Cooktop Light: Yes Yes Yes

High Yes Yes Yes

Low Yes Yes Yes

Manual Off Yes Yes Yes

Auto Off Yes Yes Yes

Wattage 30 Watts 30 Watts 30 Watts

Light Cover Glass Glass Glass

Size of Cover 8" W x 3-1/2" H 8" W x 3-1/2" H 8" W x 3-1/2" H

Display Indicators:

Display Annunciators 14 - In Display 21 - In Display 21 - In Display

Display Words 49 - Spelled In Display 56 - Spelled In Display 56 - Spelled In Display

Microwave Cook Indication “COOK” Annunciator “COOK” Annunciator “COOK” Annunciator

Microwave Stage Indication "2" Annunciator Only "2" Annunciator Only "2" Annunciator Only

Microwave Defrost Indication “DEFR” Annunciator “DEFR” Annunciator “DEFR” Annunciator

Sensor Cook Indication "SENSOR" Annunciator "SENSOR" Annunciator “SENSOR” Annunciator

Convection Cook Indication No "CONV" Annunciator "CONV" Annunciator

Convection Preheat Indication No "PREHEAT" Annunciator "PREHEAT" Annunciator

Combination Cook Indication No "COMB" Annunciator "COMB" Annunciator

Auto Cycle Indication “AUTO” Annunciator “AUTO” Annunciator “AUTO” Annunciator

Auto Start Indication No "DELAY" Annunciator "DELAY" Annunciator

User Enter Indication “ENTER” Annunciator “ENTER” Annunciator “ENTER” Annunciator

Start Indication “START?” Annunciator “START?” Annunciator “START?” Annunciator

Probe Temp Indication No "TEMP" & "PROBE" Annunciator "TEMP" & "PROBE" Annunciator

Weight Indication “OZ” “OZ” “OZ”

Clock Set “CLOCK” & Colon Flashes “CLOCK” & Colon Flashes “CLOCK” & Colon Flashes

Independent Minute Timer “TIMER” Annunciator “TIMER” Annunciator “TIMER” Annunciator

End Of Cooking Reminder “END” “END” “END”

Power Failure Indication Yes - 888:88 Displayed Yes - 888:88 Displayed Yes - 888:88 Displayed

Technical Error Indication “F-” With Error Number “F-” With Error Number “F-” With Error Number

Diagnostic System Yes Yes Yes

Audible Signals: Yes Yes Yes

Type Resonator Resonator Resonator Programming Tone

(w/On/Off Function) Between Cycles (w/On/Off Function)

Yes - One Short Beep Yes - One Short Beep Yes - One Short Beep

Yes - Two Beeps Yes - Two Beeps Yes - Two Beeps

4-12

Page 77

Cooking Products Service Manual Original March, 1997 4322167

MODEL NUMBER MH7135XEQ MH9115XEB MH9115XEQ

OVEN INTERIOR FEATURES:

Size 19" W x 8-9/16" H x 14-5/8" D 18-3/16" W x 8-5/32" H x 12-5/8" D 18-3/16" W x 8-5/32" H x 12-5/8" D

Capacity 1.3 Cubic Feet 1.1 Cubic Feet 1.1 Cubic Feet

Finish Epoxy Powder Coat Epoxy Powder Coat Epoxy Powder Coat

Cooking Power 900 Watts (IEC-705 Rating) 850 Watts (IEC-705 Rating) 850 Watts (IEC-705 Rating)

Ventilation Forced Air Forced Air Forced Air

Shelf Spillguard Sealed-In Spillguard Sealed-In Spillguard Sealed-In

Bi-Level Rack Yes Yes Yes

Light

Turntable Roller Yes No No

Temperature Probe No Yes Yes

DOOR FEATURES:

Stamped Steel Yes - With Tempered Cover Yes - With Tempered Cover Yes - With Tempered Cover

Window Water Clear Glass Low - T Glass Water Clear Glass

Window Size 17-1/3" W x 5-5/12" H 15.9" W x 5.3" H 15.9" W x 5.3" H

Window Graphics White With Dots On Edge None White With Dots On Edge

Door Screen White Black White

Door Baffle None Black White

Cooking Guide Label Yes Yes Yes

Door Swing Left Hand (Hinge Side) Left Hand (Hinge Side) Left Hand (Hinge Side)

Handle/Latch Textured, Pull to Open Textured, Pull to Open Textured, Pull to Open

Seals

Color White Black White

MICROWAVE SYSTEM:

Distribution Top Feed Bottom Feed Using Motor Driven Ant. Bottom Feed Using Motor Driven Ant.

Magnetron

SAFETY FEATURES:

Interlock

Thermal Protectors Two - 1 Magnetron & 1 Oven Cavity Two - 1 Magnetron & 1 Oven Cavity Two - 1 Magnetron & 1 Oven Cavity

VENTILATION SYSTEM:

Type Convertible Convertible Convertible

Duct Outlet Size 3-1/4" H x 10" W 3-1/4" H x 10" W 3-1/4" H x 10" W

Recirculation CFM 120 120 120

Vertical CFM (Hi/Low) 280/180 280/180 280/180

Horizontal CFM (Hi/Low) 300/200 300/200 300/200

Touch Control (2 Speed) Yes Yes Yes

Auto ON - Low Speed Yes - 133˚F/56˚C Yes - 133˚F/56˚C Yes - 133˚F/56˚C

Noise Level 55 dbA 55 dbA 55 dbA

Damper Yes Yes Yes

Grease Filter Yes (2) Yes (2) Yes (2)

Blower Type Twin Squirrel Cage Twin Squirrel Cage Twin Squirrel Cage

Shipped Vertical Recirculating Recirculating

Yes - Automatic - Turns on when

oven door is operating. 30-Watt

Extended Life (4000 Hours)

Three Stage

(Capacitive, Reflective & Absorbive)

Ceramic Dome, Horizontally

Cooled with Forced Air

Three Door/Latch Operated

Switches (1 Power Interrupt,

1 Monitor, 1 Low Voltage)

Yes - Automatic - Turns on when

oven door is operating. 30-Watt

Extended Life (4000 Hours)

Three Stage

(Capacitive, Reflective & Absorbive)

Ceramic Dome, Horizontally

Cooled with Forced Air

Three Door/Latch Operated

Switches (1 Power Interrupt,

1 Monitor, 1 Low Voltage)

Yes - Automatic - Turns on when

oven door is operating. 30-Watt

Extended Life (4000 Hours)

(Capacitive, Reflective & Absorbive)

Ceramic Dome, Horizontally

Cooled with Forced Air

Three Door/Latch Operated

Switches (1 Power Interrupt,

1 Monitor, 1 Low Voltage)

Page 4-13

Three Stage

4-13

Page 78

MODEL NUMBER MH7135XEQ MH9115XEB MH9115XEQ

EXTERIOR FEATURES:

Outside Dimensions 19" W x 8-9/16" H x 14-5/8" D 29-7/8" W x 16-3/16" H x 14" D 29-7/8" W x 16-3/16" H x 14" D

Cabinet Finish White Textured Black Textured White Textured

Construction

Bottom Finish Painted Steel - Matte Gray Painted Steel - Matte Black Painted Steel - Matte Gray

Bottom Construction High Gauge Steel - No Embossments High Gauge Steel - No Embossments High Gauge Steel - No Embossments

Control and Door Frames One Piece Molded - White One Piece Molded - Black One Piece Molded - White

Cooktop Light w/Touch Control Two Lamps - 30 Watt Easy Access Two Lamps - 30 Watt Easy Access Two Lamps - 30 Watt Easy Access

Power Cord Length 4-feet 4-feet 4-feet

OTHER SPECIFICATIONS:

Electrical

Domestic Use Only Yes Yes Yes

Agency Approvals FCC, DHHS, U.L. Listed FCC, DHHS, U.L. Listed FCC, DHHS, U.L. Listed

Approximate Shipping Weight 64 lbs. 79 lbs. 79 lbs.

Approximate Net Weight 58 lbs. 69 lbs. 69 lbs.

Carton Dimensions 33-7/16" W x 19-5/16" H x 19-17/32" D 33" W x 17-3/8" H x 18-3/16" D 33" W x 17-3/8" H x 18-3/16" D

APPROVED ACCESSORIES:

Filler Kit 4158439 4158311 4158439

Charcoal Filter Kit 4359416 (Included) 4359416 (Included) 4359416 (Included)

Exhaust Damper Assembly Yes (1 Set) Yes (1 Set) Yes (1 Set)

Hardware For Installation Yes (1 Set) Yes (1 Set) Yes (1 Set)

LITERATURE:

Use & Care Guide 4359338 4359339 4359339

Installation Instructions 4359330 4359330 4359330

Warranty In Use & Care In Use & Care In Use & Care

Cooking Guide In Use & Care In Use & Care In Use & Care

Cookbook with Hard Cover Accessory: 4358520 Accessory: 4358520 Accessory: 4358520

Carton Tag Std. - On Carton Corner Std. - On Carton Corner Std. - On Carton Corner

Tech Sheet 4359414 4359414 4359414

Service Manual 4322167 4322167 4322167

Unitized Chassis With

Wrapper & Mounting Plate

120V, Single Phase, 60 Hz, 1500 Watts

For Use With 15 or 20 Amp Circuit

Unitized Chassis With

Wrapper & Mounting Plate

120V, Single Phase, 60 Hz, 1500 Watts

For Use With 15 or 20 Amp Circuit

120V, Single Phase, 60 Hz, 1500 Watts

For Use With 15 or 20 Amp Circuit

Unitized Chassis With

Wrapper & Mounting Plate

4-14

Page 79

MODEL & SERIAL NUMBER EXPLANATION

MODEL NUMBER M H 7 13 0 X E Q 0

INTERNATIONAL SALES IND.

OR MARKETING CHANNEL, IF PRESENT

PRODUCT GROUP

M = MICROWAVE

PRODUCT IDENTIFICATION

B = BROWNER C = CONVECTION G = GRILL / CRISPER H = OTR HOOD COMBO K = KITS S = STIRRER FAN T = TURNTABLE

MODEL VARIATIONS

0 - 9

CUBIC FEET

04 = .4 CU. FT. 10 = 1.0 CU. FT. 06 = .6 CU. FT. 12 = 1.2 CU. FT. 07 = .7 CU. FT. 13 = 1.3 CU. FT. 08 = .8 CU. FT. 14 = 1.4 CU. FT. 09 = .9 CU. FT. 16 = 1.6 CU. FT.

FEATURE LEVEL

0 = 30" KIT (IF KIT) 2 = 22" KIT (IF KIT) 4 = 24" KIT (IF KIT) 5 = SENSORED MODEL 7 = 27" KIT (IF KIT)

Cooking Products Service Manual Original March, 1997 4322167

Page 4-15

FEATURE CODE

C = CSA APPROVED X = FEATURE NOT DEFINED

YEAR OF INTRODUCTION

D = 1996 E = 1997

COLOR CODE

B = BLACK Q = WHITE Z = ALMOND

ENGINEERING CHANGE (0, 1, 2, ETC.)

SERIAL PLATE LOCATION

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Page 80

WHIRLPOOL MICROWAVE HOOD WARRANTY

LENGTH OF WARRANTY

ONE YEAR FULL WARRANTY

From Date of Installation.

SECOND THROUGH FIFTH YEAR LIMITED WARRANTY

From Date of Installation.

WHIRLPOOL WILL PAY FOR:

FSP® replacement parts and repair labor costs to correct defects in materials or workmanship. Service must be provided by an authorized Whirlpool service company.

Replacement of microwave magnetron tube on microwave oven to correct defects in materials or workmanship.

For convection cooking models, replacement parts for the electric element to correct defects in materials or workmanship.

WHIRLPOOL WILL NOT PAY FOR:

A. Service calls to:

1. Correct the installation of the oven.

2. Instruct you how to use the oven.

3. Replace house fuses or correct house wiring.

B. Repairs when oven is used in other

than normal home use.

C. Damage resulting from accident,

alteration, misuse, abuse, improper installation or installation not in accordance with local electrical codes.

D. Any labor costs during the limited

warranty.

E. Replacement parts or repair labor

costs for units operated outside the United States.

F. Pickup and delivery. This product is

designed to be repaired in the home.

G. Repairs to parts or systems caused

by unauthorized modifications made to the appliance.

WHIRLPOOL DOES NOT ASSUME ANY RESPONSIBILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this exclusion may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state-to-state.

Outside the United States and Canada, a different warranty may apply. For details, please contact your authorized Whirlpool dealer.

If you need service, first see the “If You Need Assistance or Service” section of the Use and Care Guide. After checking “If You Need Assistance or Service,” additional help can be found by calling our Consumer Assistance Center telephone number, 1-800-253-1301, from anywhere in the U.S.A.

® Registered Trademark/SM Service Mark of Whirlpool Corporation

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Whirlpool 1997 E User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual