This Job Aid, “Whirlpool Microwave Oven Hood Combination,” (Part No.8178053 ), provides the
technician with information on the operation and service of the Whirlpool Microwave Oven Hood
Combination. It is to be used as a training Job Aid and Service Manual. For specific 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 service technician 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 Factory Service Technicians.
Your safety and the safety of others is very important.
Important safety messages have been provided in this Job Aid. Always read and obey all
safety messages.
This is the safety alert symbol.
This symbol alerts you to hazards that can kill or hurt you
and others.
All safety messages will be preceded by the
safety alert symbol and the word “WARNING.”
All safety messages will identify the hazard, tell
you how to reduce the chance of injury, and tell
you what can happen if the instructions are not
followed.
WARNING
ELECTRICAL SHOCK HAZARD
Disconnect power before servicing.
Replace all panels before operating.
Failure to do so could result in death or
electrical shock.
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 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-V16FA-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 ELECTRONICS
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 finished, 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 finger 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 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/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 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 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 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.
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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 com-
pliance 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 micro-
wave 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 approved R.F. measuring device to assure 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.
NOTE: Enter leakage readings in space BEFORE and AFTER 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 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 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:
Office 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.
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.
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WHIRLPOOL MODEL & SERIAL NUMBER DESIGNATIONS
MODEL NUMBER
MODEL NUMBERMH6140XKQ0
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. 10 = 1.0 CU. FT.
06 = .6 CU. FT. 12 = 1.2 CU. FT.
07 = .7 CU. FT. 14 = 1.4 CU. FT.
08 = .8 CU. FT. 15 = 1.5 CU. FT.
09 = .9 CU. FT. 16 = 1.6 CU. FT.
FSP ® Replacement parts and
repair labor costs
to correct defects
in materials or
workmanship.
Service must be
provided by a
Whirlpool-designated servicing
company.
FSP ® Replacement magnetron
tube on microwave
ovens if defective
in materials or
workmanship.
WHIRLPOOL
WILL NOT PAY FOR:
A. Service calls to:
1. Correct the installation of the microwave
oven.
2. Instruct you how to use the microwave
oven.
3. Replace house fuses or correct house
wiring.
4. Replace owner-accessible light bulbs.
B. Repairs when microwave oven is used in
other than normal single-family household
use.
C. In-home service. Your microwave oven must
be taken to a Whirlpool-designated service
company, except when your microwave oven
is installed over an approved oven using an
approved built-in kit.
D. Damage to the microwave oven resulting
from accident, alteration, misuse, abuse, fire,
flood, acts of God, or use of products not
approved by Whirlpool Corporation.
E. Any labor costs during the limited warranty.
F. Repairs to parts or systems resulting from
unauthorized modifications made to the
appliance.
G. Replacement parts or repair labor costs for
units operated outside the United States.
WHIRLPOOL CORPORATION SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. Some states do not allow the exclusion or limitation of incidental or
consequential damages, so this exclusion or limitation 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, this warranty does not apply. Contact your authorized Whirlpool dealer to determine if another warranty applies.
If you need service, see the “Requesting Assistance or Service” in the Use & Care Guide, or by
calling our Customer Interaction Center telephone number, 1-800-253-1301, from anywhere in
the U.S.A.
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