KitchenAid KHMS105E Manual de usuario

LIT4317216Printed in U.S.A.

SERVICE MANUAL

for the

March, 1997

MICROWAVE OVEN

HOOD COMBINATION

( E Model Line)

THIS MANUAL CONTAINS INFORMATION NECES-

SARY FOR SERVICING THE KITCHENAID MICRO-

WAVE OVEN HOOD COMBINATION , MODELS:

KHMS105E

KHMC107E

THE MANUAL IS DESIGNED TO BE USED ONLY BY

QUALIFIED SERVICE PERSONNEL. THE SERVICE

INFORMATION IS ORGANIZED TO HELP YOU EAS-

ILY FIND WHAT YOU NEED.

CHECK YOUR LOCAL BUILDING CODE FOR THE

PROPER MODE OF INSTALLATION. IN THE AB-

SENCE 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 ELECTRI-

CAL CODE, PART 1

iii

Original 03/97

Page iii

Microwave Oven Hood Combo Service Manual — LIT 4317216

TABLE OF CONTENTS Page

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

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

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

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

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

2-2

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

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

2-4

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

Removing The Door Choke ........................................................................................................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 ....................................................................................... 2-11

Removing The Magnetron Thermal Fuse.............................................................................. 2-12

Removing The Cavity Thermal Fuse ..................................................................................... 2-13

Removing The Convection Thermistor .................................................................................. 2-14

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

2-16

Removing The Oven Light Socket ......................................................................................... 2-16

Removing The Control Circuit Board ..................................................................................... 2-17

Removing The Temperature Probe Socket .......................................................................... 2-18

Removing The Fan Motor ........................................................................................................ 2-19

Removing The Power Cord ..................................................................................................... 2-20

Removing The Blower Motor Capacitor ................................................................................ 2-21

Removing The Convection Heating Element........................................................................ 2-22

Removing The Gas Sensor ..................................................................................................... 2-24

Removing The Synchronous Motor........................................................................................ 2-25

Removing A Cooktop Light Socket ........................................................................................ 2-26

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

2-27

Accessing The High Voltage Components ........................................................................... 2-28

Removing The Magnetron ....................................................................................................... 2-29

Removing The High Voltage Rectifier And The High Voltage Capacitor ......................... 2-30

Removing The High Voltage Transformer ............................................................................ 2-32

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

Things To Know ........................................................................................................................ 3-11

Charts ......................................................................................................................................... 3-12

Checking The Microwave Power Output ............................................................................... 3-15

Checking For Microwave Energy Leakage ........................................................................... 3-16

Component Testing .................................................................................................................. 3-19

Control Circuit Board Checklist .............................................................................................. 3-24

Primary, Monitor, & Secondary Switch Checkout Procedure............................................. 3-25

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

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

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

Specifications ...............................................................................................................................4-7

Specification Charts ....................................................................................................................4-8

Model & Serial Number Explanation...................................................................................... 4-12

KitchenAid Microwave Hood Warranty .................................................................................. 4-13

Original 03/97

Page v

Microwave Oven Hood Combo Service Manual — LIT 4317216

IMPORTANT SAFETY INFORMATION

KITCHENAID ASSUMES NO RESPONSIBILITY

FOR ANY REPAIRS MADE ON OUR PRODUCTS

BY ANYONE OTHER THAN AUTHORIZED

KITCHENAID SERVICE TECHNICIANS.

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.

• Assure that electrical installation is ad-

equate and in conformance with the Na-

tional 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. Elec-

trical wires may be concealed behind the

wall covering.

Failure to do so could result In fire, electri-

cal shock, or other personal injury.

WARNING

• National Fire Protection Association

Batterymarch Park

Quincy, Massachusetts 02269

This service manual is intended for factory-

service technicians only. We recommend that

customers DO NOT service their own units,

because of the complexity and risk of high-

voltage electrical shock.

The following information is used throughout

this manual, and should be read carefully.

NOTE

Helpful information that explains a more

complicated step, prior to carrying it out.

Information that will help you avoid actions

that could cause product damage (scratches,

dents, etc.) and damage to personal prop-

erty.

CAUTION

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.

WARNING

CAUTION

WARNING TO SERVICE TECHNICIANS

• Proper operation of the microwave ovens

requires that the magnetron be properly

assembled to the waveguide and cavity.

Never operate the magnetron unless it is

properly installed.

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

assembled around the magnetron dome

properly when installing the magnetron.

• Routine service safety procedures should

be exercised at all times.

• Untrained personnel should not attempt

service without a thorough review of the test

procedures and safety information contained

in this manual.

To avoid possible exposure to microwave ra-

diation or energy, visually check the oven for

damage to the door and door seal before

operating the oven. Use your microwave sur-

vey meter to check the amount of leakage

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

Ieakage exceeds 4 mw/cm2at 5 cm, appropri-

ate repair must be made before continuing to

service the unit. Check interlock function by

operating the door latch. The oven cook cycle

should cut off before the door can be opened.

The door and latching assembly contains the

radio frequency energy within the oven. The

door is protected by three safety interlock

switches. Do not attempt to defeat them. Un-

der no circumstances should you try to oper-

ate the oven with the door open.

PRECAUTIONS TO BE OBSERVED BEFORE AND DUR-

ING SERVICING TO AVOID POSSIBLE EXPOSURE TO

EXCESSIVE MICROWAVE ENERGY.

1. Do not operate or allow the oven to be

operated with the door open.

2. Make the following safety checks on all

ovens to be serviced before activating the

magnetron or other microwave source,

and make repairs as necessary:

a)Interlock Operation.

b)Proper Door Closing.

c) Seal and Sealing Surfaces (Arcing,

Wear, and Other Damage).

d)Damage to or Loosening of Hinges and

Latches.

e)Evidence of Dropping or Abuse.

3. Before turning on microwave power for

any service test or inspection within the

microwave generating compartments,

check the magnetron, wave guide or trans-

mission line, and cavity for proper align-

ment, integrity, and connections.

4. Any defective or misadjusted components

in the interlock, monitor, door seal, and

microwave generation and transmission

systems shall be repaired, replaced, or

adjusted by procedures described in this

manual before the oven is released to the

owner.

5. A microwave leakage check to verify com-

pliance with the Federal performance

standard should be performed on each

oven prior to release to the owner.

6. Do not attempt to operate the oven if the

door glass is broken.

vii

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Page vii

Microwave Oven Hood Combo Service Manual —LIT 4317216

CAUTION: BEFORE TOUCHING

ANY OVEN COMPONENTS OR

WIRING, ALWAYS UNPLUG THE

OVEN FROM ITS POWER

SOURCE AND DISCHARGE THE

CAPACITOR BY USING A

20,000-OHM DISCHARGE RESIS-

TOR.

USE AN INSULATED PLASTIC-

HANDLE SCREWDRIVER AND

SHORT ACROSS THE CAPACI-

TOR TERMINALS.

CAUTION

CAUTION: REPLACE BLOWN

FUSE WITH 15 AMPERE CLASS H

FUSE ONLY.

Before replacing the blown oven fuse, test the

upper and lower door interlock switches, cook

relay or latch relay, and interlock monitor switch

(middle switch) for proper operation as de-

scribed in the component test procedures.

DO NOT ATTEMPT TO REPAIR STICKING

CONTACTS OF ANY INTERLOCK SWITCH,

SAFETY SWITCH, OR COOK (LATCH) RE-

LAY (REPLACE SWITCHES).

Any indication of sticking contacts during com-

ponent test requires replacement of that com-

ponent to assure reliability of the safety inter-

lock system.

IF THE FUSE IS BLOWN, THE MONITOR,

PRIMARY INTERLOCK AND SECONDARY

INTERLOCK SWITCHES MUST ALSO BE

REPLACED. BE SURE THEY ARE PROP-

ERLY CONNECTED.

NOTES:

• For proper repair and assembly of the oven

door, refer to page 2-4.

• Interlock switches are not adjustable indi-

vidually.

• For proper repair and adjustment of the

interlock switches, refer to page 2-8.

WARNING

DISCONNECT FROM POWER SUPPLY

BEFORE SERVICING.

CAUTION: HIGH VOLTAGES ARE

PRESENT DURING THE COOK

CYCLE. EXTREME CAUTION

SHOULD BE OBSERVED AT ALL

TIMES.

CAUTION: DO NOT TOUCH

OVEN COMPONENTS OR WIR-

ING DURING OVEN OPERATION.

ATTACH METER LEADS WITH

ALLIGATOR CLIPS WHEN MAK-

ING OPERATIONAL TESTS.

CAUTION: IT IS NEITHER NEC-

ESSARY NOR ADVISABLE TO

ATTEMPT MEASUREMENT OF

HIGH VOLTAGES.

KitchenAid microwave ovens have a monitor-

ing system designed to assure proper opera-

tion of the safety interlock systems.

The interlock monitor switch will immediately

cause the oven fuse to blow if the door is

opened while the following combined failure

exists:

Primary door interlock switch and/or second-

ary interlock switch contacts failed in a closed

position.

viii

R.F. LEAKAGE TEST

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

proved R.F. measuring device to assure less

than 4 mw/cm2emission at 5 cm distance with

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/cm2to allow for

measurement uncertainty.

NOTE: Enter leakage readings in space BE-

FORE and AFTER on the service document.

All microwave ovens exceeding the emission

level of 4 mw/cm2must be reported to Dept. of

Service for microwave ovens immediately and

the owner should be told not to use the micro-

wave oven until it has been repaired com-

pletely.

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 man-

ner that microwave energy emissions are mini-

mal.

Address for CDRH is:

Office of Compliance (HFZ-312) Center for

Devices and Radiological Health

1390 Piccard Drive

Rockville, Maryland 20850

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 pat-

tern 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.

Microwave Oven Hood Combo Service Manual — LIT 4317216 Page 1-1

1-1

Original 03/97

THEORY OF OPERATION

The microwave oven is powered by the 120-

volt 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 six relays to operate

the various functions of the microwave oven

(shown below). The relays are controlled by

the microcomputer on the control board, and

perform the functions shown below.

Relay 4 controls the speed of the blower motor

through the control 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.

Relay 1 ........................................................ Oven Light/Fan & Turntable 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 ........................................................ Cooktop Lights

Relay 6 ........................................................ Night Lights

RELAY 4

BASE

THERMAL

FUSE

(LOW)

(HI)

(C)

(NC) (NO)

BLOWER

MOTOR

CN3

RELAY RY2

MICROCOMPUTER

RELAY RY4

RELAY RY3

RELAY RY1

RELAY RY5

RELAY RY6

CONTROL

CIRCUIT

BOARD

1-2

The normally-closed (N.C.) contacts of relay 4 provide a potential circuit for the Base Thermal

Fuse (see the following strip circuit). 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.

15A LINE

FUSE

CAVITY

THERMAL

FUSE

MAGNETRON

THERMAL

FUSE

BK BK

RELAY #4

BASE

THERMAL

FUSE

LOW-VOLTAGE

TRANSFORMER

BLOWER

MOTOR

LOW

MICROCOMPUTER

BOARD

4 1

CAPACITOR

When the low-speed fan is selected by the user at the control panel, relay 3 and the normally-

closed (N.C.) contacts of relay 4, complete the circuit to the low-speed windings of the blower

motor and turn it on.

15A LINE

FUSE

CAVITY

THERMAL

FUSE

MAGNETRON

THERMAL

FUSE

BK BK

RELAY #4

LOW-VOLTAGE

TRANSFORMER

BLOWER

MOTOR

LOW

RELAY #3

MICROCOMPUTER

BOARD

4 1

CAPACITOR

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.

15A LINE

FUSE

CAVITY

THERMAL

FUSE

MAGNETRON

THERMAL

FUSE

BK BK

RELAY #4

LOW-VOLTAGE

TRANSFORMER

BLOWER

MOTOR

HIGH

MICROCOMPUTER

BOARD

4 1

CAPACITOR

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