Whirlpool KM-30 8178573 User manual

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MICROWAVE
OVEN HOOD
COMBINATION
KM-30
8178573

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FORWARD
This Job Aid, “Whirlpool Microwave Oven Hood Combination,” (Part No. 8178573), provides the
In Home Service Professional with information on the operation and service of the Whirlpool Micro-
wave Oven Hood Combination. It is to be used as a training Job Aid and Service Manual. For specic
information on the model being serviced, refer to the “Use and Care Guide,” or “Tech Sheet” provided
with the microwave oven.
The Wiring Diagrams and Strip Circuits used in this Job Aid are typical and should be used for
training purposes only. Always use the Wiring Diagram supplied with the product when servicing
the unit.
GOALS AND OBJECTIVES
The goal of this Job Aid is to provide detailed information that will enable the In Home Service Profes-
sional to properly diagnose malfunctions and repair the Microwave Oven Hood Combination.
The objectives of this Job Aid are to:
• Understand and follow proper safety precautions.
• Successfully troubleshoot and diagnose malfunctions.
• Successfully perform necessary repairs.
• Successfully return the microwave oven to proper operational status.
WHIRLPOOL CORPORATION assumes no responsibility for any repairs made
on our products by anyone other than Authorized In Home Service Professionals.
Copyright © 2006, Whirlpool Corporation, Benton Harbor, MI 49022

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TABLE OF CONTENTS
GENERAL................................................................................................................................. 1-1
Important Safety Information ............................................................................................ 1-1
Warning to In Home Service Professionals ...................................................................... 1-2
Precautions To Be Observed Before and During Servicing
to Avoid Possible Exposure to Excessive Microwave Energy .......................................... 1-3
R.F. Leakage Test ............................................................................................................. 1-4
Whirlpool Model Number Designations ............................................................................ 1-5
Whirlpool Serial Number Designations ............................................................................. 1-6
Model & Serial Number Label and Tech Sheet Locations ................................................ 1-6
Specications.................................................................................................................... 1-7
Whirlpool Microwave Oven Warranty................................................................................ 1-10
INSTALLATION INFORMATION............................................................................................... 2-1
Hood Fan Motor Mounting Positions ................................................................................ 2-1
THEORY OF OPERATION........................................................................................................ 3-1
Air Flow Paths................................................................................................................... 3-1
COMPONENT ACCESS ........................................................................................................... 4-1
Component Locations....................................................................................................... 4-1
Removing the Turntable Motor & Hood (Cooktop) Lamp Assembly ................................. 4-2
Removing the Control Panel & Control Board .................................................................. 4-4
Removing the Motor Capacitor and Line Fuse ................................................................. 4-6
Removing the Door Switches ........................................................................................... 4-6
Removing the Oven Cavity Lamp and Charcoal Filter...................................................... 4-8
Removing the Oven Rack Retainers ................................................................................ 4-9
Removing the Outer Cabinet ............................................................................................ 4-10
Removing the Thermostats and Thermistor...................................................................... 4-11
Removing the Magnetron ................................................................................................. 4-12
Removing the High-Voltage Transformer.......................................................................... 4-13
Removing the High-Voltage Diode and Capacitor ............................................................ 4-14
Removing the Oven Cavity Lamp Socket ......................................................................... 4-15
Removing the AC Line Filter ............................................................................................. 4-16
Removing the Hood Fan Motor and Humidity Sensor ...................................................... 4-17
Removing the Fuse Holder & Mounting Bracket............................................................... 4-18
Removing the Door and Door Disassembly...................................................................... 4-19
COMPONENT TESTING........................................................................................................... 5-1
H.V. Transformer............................................................................................................... 5-1
Magnetron......................................................................................................................... 5-2
H.V. Capacitor................................................................................................................... 5-2
H.V. Diode......................................................................................................................... 5-3

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Turntable Motor................................................................................................................. 5-3
Humidity Sensor ............................................................................................................... 5-4
Hood Exhaust Fan Motor.................................................................................................. 5-4
AC Line Filter .................................................................................................................... 5-5
Thermostats...................................................................................................................... 5-5
DIAGNOSIS & TROUBLESHOOTING ..................................................................................... 6-1
Interlock Switch Checkout Procedures ............................................................................. 6-1
Touch Panel and Electronic Control Test .......................................................................... 6-2
Microwave Oven Power Output Test ................................................................................ 6-3
Failure Codes Indications ................................................................................................. 6-3
WIRING DIAGRAM & STRIP CIRCUITS.................................................................................. 7-1
Wiring Diagram - 8205889 - Sensor Model ...................................................................... 7-1
Wiring Diagram - 8205660 - Non Sensor Model............................................................... 7-2
Strip Circuits ..................................................................................................................... 7-3
Microwave Cooking..................................................................................................... 7-3
Hood Exhaust Fan On High Automatically.................................................................. 7-3
Hood Exhaust Fan On Low Speed.............................................................................. 7-3
Hood Exhaust Fan On High / Medium ........................................................................ 7-4
Microwave Oven Plugged In—Time of Day Displayed ............................................... 7-4
Door Open—Oven Cavity Light Is On......................................................................... 7-4
Cooktop Light On High................................................................................................ 7-4
Cooktop Light On Low (Night Light)............................................................................ 7-4
TABLE OF CONTENTS - CONTINUED

1-1
GENERAL
IMPORTANT SAFETY INFORMATION
IMPORTANT SAFETY
INSTRUCTIONS
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 insulat-
ed plastic handle screwdriver to short across
the capacitor terminals.
Check that the unit is grounded before trouble-
shooting. 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-VI6-FA-62 or VP-532A-OF; Oven
Lamp Switch: SZM-V6-FA-31 or VP-331 AOD.
It is neither necessary nor advisable to attempt
measurement of high voltage.
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.
ELECTROSTATIC DISCHARGE
(ESD) SENSITIVE ELECTRONIC
ESD problems are present everywhere. ESD
may damage or weaken the electronic control
assembly. The new control assembly
may appear to work well after repair is nished,
but failure may occur at a later date
due to ESD stress.
• Use an antistatic wrist strap. Connect
the wrist strap to a green ground connection
point or unpainted metal in the
appliance; or touch your nger repeatedly
to a green ground connection point
or unpainted metal in the appliance.
• Before removing the part from its package,
touch the antistatic bag to a green
ground connection point or unpainted
metal in the appliance.
• Avoid touching electronic parts or terminal
contacts. Handle the electronic
control assembly by the edges only.
• When repackaging the failed electronic
control assembly in an antistatic bag,
observe the above instructions.

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WARNING TO IN HOME SERVICE PROFESSIONALS
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/cm2 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 Job Aid.
Whirlpool microwave ovens have a monitoring
system designed to ensure 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 a blown fuse with a 20
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. The components must
be replaced.
Any indication of sticking contacts during compo-
nent tests requires replacement of that compo-
nent to ensure reliability of the safety interlock
system.
NOTE: If the fuse is blown, the monitor, primary,
and secondary interlock switches must be re-
placed. Be sure they are properly connected.

1-3
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,
integrity, and connections.
D. Any defective or misadjusted components
in the interlock, monitor, door seal, and
microwave generation and transmission
systems shall be repaired, replaced, or
adjusted, using procedures described in
this Job Aid, before the oven is released to
the owner.
E. A microwave leakage check to verify compli-
ance with Federal Performance Standard
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.

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R.F. LEAKAGE TEST
EQUIPMENT
• Electromagnetic energy leakage monitor
(NARDA 81 00B, HOLADAY H 1501 ).
• 275 ±15 ML glass beaker.
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 275 ±15 ML (9.3 oz.) glass of
water in the center of the oven bottom.
3. Select “HIGH” cook power, turn the microwave
oven on, and test for R.F. Ieakage at
the following locations:
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 ap-
proved R.F. measuring device to ensure less
than 4 mw/cm2 emission at 5 cm distance with
a maximum scan rate of 2.54 cm/second, in
compliance with U.S. Government Department
of Health, Education and Welfare 21CFR1030,
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/cm2 to allow for
measurement uncertainty.
NOTE: Enter leakage readings in BEFORE and
AFTER spaces on the service document.
All microwave ovens exceeding the emission
level of 4 mw/cm2 must 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 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 nal
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 with new ones, because the contacts
of those interlock switches may be melted and
welded together.
If safety interlock/monitor switch replacement,
or adjustment, is required, you must reconnect
the circuit, and perform a continuity check on
the monitor circuit.
All repairs must be performed in such a manner
that microwave energy emissions are minimal.
Address for CDRH is:
Ofce of Compliance (HFZ-342) Center for
Devices and Radiological Health
2098 Gaither Road
Rockville, MD 20850
* CDRH: Center for Devices and Radiological
Health, Food and Drug Administration.

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WHIRLPOOL MODEL NUMBER DESIGNATIONS
MODEL NUMBER M H 2 17 5 X S T 0
INTERNATIONAL SALES IND.
OR MARKETING CHANNEL
IF PRESENT
PRODUCT GROUP
G = WHIRLPOOL GOLD
M = MICROWAVE
PRODUCT IDENTIFICATION
B = BROWNER
C = CONVECTION
G = GRILL / CRISPER
H = OTR HOOD COMBO
K = KITS
M = GOLD CONVECTION
S = STIRRER FAN
T = TURNTABLE
MODEL VARIATIONS
0 - 9
CUBIC FEET
04 = .4 CU. FT. 09 = 0.9 CU. FT. 15 = 1.5 CU. FT.
06 = .6 CU. FT. 10 = 1.0 CU. FT. 16 = 1.6 CU. FT.
07 = .7 CU. FT. 12 = 1.2 CU. FT. 17 = 1.7 CU. FT.
08 = .8 CU. FT. 14 = 1.4 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)
FEATURE CODE
C = CSA APPROVED
S = CARRY IN WARRANTY (EFFECTIVE 02/96)
X = IN HOME WARRANTY (EFFECTIVE 02/96)
YEAR OF INTRODUCTION
S = 2006, T = 2007, V = 2008
COLOR CODE
B = BLACK, Q = WHITE, T = BISCUIT
ENGINEERING CHANGE (0, 1, 2, 3, ETC.)

1-6
WHIRLPOOL SERIAL NUMBER DESIGNATIONS
SERIAL NUMBER TR T 06 10001
MANUFACTURING SITE
TR = Shunde
YEAR OF PRODUCTION
T = 2006
WEEK OF PRODUCTION
06 = 6th week of the year
PRODUCT SEQUENCE NUMBER
MODEL & SERIAL NUMBER LABEL AND
TECH SHEET LOCATIONS
Model & Serial
Number Location
Tech Sheet Location
(In black poly bag)