KitchenAid KHMS105E User Manual
SERVICE MANUAL
for the
March, 1997
MICROWAVE OVEN
HOOD COMBINATION
( E Model Line)
LIT4317216Printed in U.S.A.
THIS MANUAL CONTAINS INFORMATION NECESSARY FOR SERVICING THE KITCHENAID MICROWAVE 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 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
.
ii
Microwave Oven Hood Combo Service Manual — LIT 4317216
Original 03/97
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 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 .....................................................................................................
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 ....................................................................................................
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
2-2
2-4
2-16
2-27
iii
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
iv
Microwave Oven Hood Combo Service Manual — LIT 4317216
WARNING
IMPORTANT SAFETY INFORMATION
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
Do not obstruct the flow of ventilation air.
Electrical Shock Hazard
It is the customer’s responsibility to:
• Contact a qualified electrical installer.
Original 03/97
Page v
Fire Hazard
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
KITCHENAID ASSUMES NO RESPONSIBILITY
FOR ANY REPAIRS MADE ON OUR PRODUCTS
BY ANYONE OTHER THAN AUTHORIZED
KITCHENAID SERVICE TECHNICIANS.
v
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.
2
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.
vi
Microwave Oven Hood Combo Service Manual — LIT 4317216
WARNING
CAUTION
KitchenAid microwave ovens have a monitoring system designed to assure proper operation of the safety interlock systems.
Original 03/97
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 page 2-4.
• 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.
OR
vii
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.
2
emission at 5 cm distance with
2
to allow for
2
must be reported to Dept. of
Address for CDRH is:
Office of Compliance (HFZ-312) Center for
Devices and Radiological Health
1390 Piccard Drive
Rockville, Maryland 20850
viii
Microwave Oven Hood Combo Service Manual — LIT 4317216
RELAY 4
BASE
THERMAL
FUSE
(LOW)
(HI)
(C)
(C)
(NC)
(NO)
BLOWER
MOTOR
L1
THEORY OF OPERATION
Original 03/97
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 six relays to operate
the various functions of the microwave oven
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.
(shown below). The relays are controlled by
the microcomputer on the control board, and
perform the functions shown below.
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
MICROCOMPUTER
CONTROL
CN3
CIRCUIT
BOARD
2
1
RELAY RY2
RELAY RY4
RELAY RY3
RELAY RY1
1
RELAY RY5
RELAY RY6
1-1
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.
L1
BK
15A LINE
FUSE
BK
CAVITY
THERMAL
FUSE
BK
MAGNETRON
THERMAL
FUSE
BK
MICROCOMPUTER
RD
TRANSFORMER
4 1
BOARD
LOW-VOLTAGE
RELAY #4
W
CAPACITOR
R
BASE
FUSE
W
BLOWER
MOTOR
LOW
YL
7
THERMAL
N
Y
BL
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.
L1
BK
15A LINE
FUSE
BK
CAVITY
THERMAL
FUSE
BK
MAGNETRON
THERMAL
FUSE
BK
MICROCOMPUTER
LOW-VOLTAGE
RD
TRANSFORMER
4 1
BOARD
W
RELAY #4
N
CAPACITOR
R
BLOWER
MOTOR
LOW
Y
BL
RELAY #3
BR
6
W
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.
L1
BK
15A LINE
FUSE
BK
CAVITY
THERMAL
FUSE
BK
MAGNETRON
THERMAL
FUSE
BK
MICROCOMPUTER
RD
TRANSFORMER
4 1
BOARD
LOW-VOLTAGE
RELAY #4
W
CAPACITOR
R
Y
8
BK
BLOWER
MOTOR
HIGH
N
BL
1-2
Microwave Oven Hood Combo Service Manual — LIT 4317216
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
Door Choke
Control Panel
Line Fuse
Interlock Switches
Base Thermal Fuse
Magnetron Thermal Fuse
Cavity Thermal Fuse
Convection Thermistor
• The Operating Control System
Oven Light Socket
Control Circuit Board
Temperature Probe Socket
Fan Motor
Power Cord
Blower Motor Capacitor
Convection Heating Element
Gas Sensor
Synchronous 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.
Original 03/97
Page 2-1
CAVITY THERMAL FUSE
GAS SENSOR
(NOT ON ALL MODELS)
CONVECTION THERMISTOR
(NOT ON ALL MODELS)
SYNCHRONOUS
MOTOR
COOKTOP LIGHTS
SECONDARY INTERLOCK SWITCH
OVEN LAMP SWITCH
MONITOR SWITCH
PRIMARY INTERLOCK SWITCH
CONTROL CIRCUIT BOARD
LINE FUSE
BASE THERMAL FUSE
CONVECTION HEATING ELEMENT
(NOT ON ALL MODELS)
BLOWER MOTOR
OVEN LIGHT
BLOWER MOTOR
CAPACITOR
HV TRANSFORMER
FAN MOTOR
HV CAPACITOR
HV RECTIFIER
MAGNETRON
MAGNETRON THERMAL FUSE
Magnetron Thermal Fuse ..........................................Opens @ 302˚F/150˚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.
2-1
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.
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 remove it.
3. Pull the connectors off the cooktop light
socket terminals and set the base plate
aside (see the illustration on the next
page).
5. Support the front of the microwave oven
and remove the two bolts and washers
from the top of the oven.
6. Using two people, remove the microwave
oven from its mounting location and set it
on a protected (padded) work surface.
4. Remove the lock pin and washer from the
top of the microwave oven.
LOCK PIN &
WASHER
7. To remove the cabinet from the microwave oven, remove the two inside screws
from the top of the cabinet that secure the
vent grille to the oven. Pull the top of the
vent grille out so the tabs are free of their
slots, and lift the bottom to unhook the
locking tabs from their slots.
8. Remove the screw from the power cord
cover and remove the cover.
9. Remove the remaining screws from the
top and rear of the cabinet.
10. 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
Microwave Oven Hood Combo Service Manual — LIT 4317216
Original 03/97
Page 2-3
POWER
CORD
VENT
GRILLE
CABINET
SCREW
VENT
GRILLE
SCREWS (2)
POWER
CORD COVER
CABINET
SCREWS
CABINET
BASE
PLATE
WIRES
RED
WHITE
COOKTOP LIGHT
ASSEMBLY WIRING
(2) RED
(2) WHITE
Removing The Cabinet
2-3
BASE PLATE
SCREWS
(6)
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.
2. Remove the vent grille and the base plate
from the microwave oven (see the illustration on page 2-3).
3. Remove the six oven door hinge screws
and remove the door.
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.
HINGE
MOUNTING
SCREWS
4. Install the new oven door and then reassemble the microwave oven.
REASSEMBLY NOTE: Make sure that you
open and close the door several times to make
sure that it operates properly before you reassemble the oven.
HINGE
MOUNTING
SCREWS
2-4
Microwave Oven Hood Combo Service Manual — LIT 4317216
REMOVING THE DOOR CHOKE
1. Disconnect the electrical supply to the
WARNING
Personal Injury Hazard
Disconnect from the electrical supply before servicing the unit. Failure to do so
could result in death or electrical shock.
PRY OUT CHOKE
COLLAR (GASKET)
microwave oven.
2. Open the oven door.
3. Pry out the choke (gasket) along the edges
of the door with a putty knife and remove
the choke.
4. Install the new choke so that it fits tightly
into place inside the door.
Original 03/97
Page 2-5
OVEN DOOR
2-5
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.
1. Disconnect the electrical supply to the
microwave oven.
TOP
LOCKING
CONTROL
PANEL
TAB
TURN PANEL OVER
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.
4. From the top and back of the control
panel,
the top of the panel out slightly, then lift
the bottom tabs of the panel out of the
slots and pull it forward. Turn the panel
over out of the way.
lift the top locking tab and pull
MOUNTING
SCREW
TOP CENTER
TAB
TAB
TAB
1
SLOT
SLOT
BOTTOM
TABS
BOTTOM
SLOTS
2-6
Microwave Oven Hood Combo Service Manual — LIT 4317216
REMOVING THE LINE FUSE
2. Remove the two screws from the top of the
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.
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. Without touching the metal ends, unsnap
the line fuse from its holder.
5. Install the new line fuse in the fuseholder
and then reassemble the microwave oven.
Original 03/97
Page 2-7
LINE FUSE
FUSEHOLDER
BLACK POWER
CORD LEAD
CONTROL PANEL
OPENING
2-7
REMOVING/ADJUSTING THE INTERLOCK SWITCHES
5. Remove the center screw from the fan
WARNING
Personal Injury Hazard
Disconnect from the electrical supply before servicing the unit. Failure to do so
could result in death or electrical shock.
cover and fold the cover back so you can
access the switches (see the illustration
below).
6. Remove the two mounting screws from
the interlock switch assembly, and position the assembly so you can easily access the switches and wiring.
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 screw from the top center tab
of the control panel (see page 2-6).
4. From the top and back of the control
panel,
the top of the panel out slightly, then lift
the bottom tabs of the panel out of the
slots and pull it forward. Set the panel
inside the oven cavity while you work.
lift the top locking tab and pull
7. Refer to inset 1 in the illustration 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.
8. One at a time, pull the wire connectors off
the defective switch, and reconnect them
to the same terminals on the replacement
switch.
9. Snap the new switch into place on the
switch housing.
10. Mount the interlock switch assembly and
then reassemble the microwave oven.
NOTE: If any adjustments are necessary, refer to page 2-10.
INTERLOCK
SWITCH
HOUSING
INTERLOCK
SCREW
FAN COVER
COVER
SCREW
FOLD
BACK
INTERLOCK
SCREW
2-8
Microwave Oven Hood Combo Service Manual — LIT 4317216
INSET 2
INSET 1
1.
RAISE THIS LOCKING
ARM TO RELEASE
SWITCH FROM HOUSING.
SECONDARY
INTERLOCK
SWITCH
INTERLOCK SWITCH
HOUSING ASSEMBLY
2.
PRESS BODY IN
THIS DIRECTION TO
REMOVE SWITCH
FROM HOUSING.
SECONDARY INTERLOCK
SWITCH
NOTE: THESE POSTS
HOLD THE SWITCH IN
PLACE ON THE HOUSING
AND ARE STATIONARY.
ALL OTHER
SWITCHES
1.
PUSH THIS LOCKING
ARM BACK TO UNLOCK
SWITCH.
2.
ROTATE SWITCH ON THIS
PIN AND REMOVE
SWITCH FROM HOUSING.
Original 03/97
Page 2-9
RED (Monitor Switch)
LARGE WHITE (Power Cord)
SMALL WHITE (Oven Lamp)
OVEN LAMP CONTROL
SWITCH
INTERLOCK MONITOR
SWITCH
PRIMARY INTERLOCK
SWITCH
PINK (CN2 Pin 1)
WHITE (H.V. Transformer)
BROWN (Temp Probe)
RED (Secondary Switch)
WHITE (H.V. Transformer)
BLUE (Oven Lamp)
PINK (Controller)
BLACK (Fan Motor)
RED (Magnetron Thermostat)
BLUE (Temp Probe)
Blue (CN2 Pin 3)
Interlock Switch Wiring
2-9
MAKING ADJUSTMENTS
1. If necessary, adjust the interlock switch
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.
2. Close and secure the fan cover with its
mounting screw.
3. Mount the control panel to the oven with
the screw you removed earlier.
4. Mount the vent grille to the microwave
oven and check out the operation of the
switches.
LATCH
HOUSING
DOOR
LATCH
CHECK GAP
HERE
DOOR
LATCH
CHECK GAP
HERE
SECONDARY
INTERLOCK
SWITCH
OVEN LAMP
CONTROL
SWITCH
INTERLOCK
MONITOR
SWITCH
PRIMARY
INTERLOCK
SWITCH
2-10
Microwave Oven Hood Combo Service Manual — LIT 4317216
REMOVING THE BASE THERMAL FUSE
2. Remove the two screws from the top of
WARNING
the cabinet for the vent grille and remove
the grille (see the illustration on page 2-3).
Original 03/97
Page 2-11
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.
3. Remove the control panel from the microwave oven (see page 2-6 for the procedure).
4. Remove the mounting screw from the base
thermal fuse and remove it.
5. Unplug the wire connectors from the base
thermal fuse terminals.
6. Install the new base thermal fuse and
then reassemble the microwave oven.
CONTROL
MOUNTING
SCREW
BROWN & WHITE
WIRES
YELLOW
WIRE
THE BASE THERMAL FUSE
CLOSES @133˚F & RESETS @ 104˚F.
PANEL
THERMAL
BASE
FUSE
TAB
SLOT
2-11
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