Whirlpool MH1150XMQ Tech Sheet

TECH SHEET - DO NOT DISCARD
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
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 & Other Damage)
4. Damage to or Loosening of Hinges &
Latches
5. Evidence of Dropping or Abuse
c. Before turning on microwave power for any
service test or inspection within the
microwave generating compartments,
POWER OUTPUT MEASUREMENT
The power output of the magnetron can be
measured by the following tap water
temperature rise test:
Be sure oven cavity is clean and cool (not
used recently).
Low voltage will lower the magnetron output.
1. Fill a glass beaker with 1000 ml (32 oz.) of tap
water. Stir the water with a thermometer
(digital recommended) and record the
temperature. This starting temperature should
be between 10°C (50°F) to 24°C (75°F).
FAILURE CODES/INDICATIONS
Display Likely Failure Condition
Flashing
Power failure
colon ":"
-F2-
Membrane switch failure
-F6-
Microwave relay failure
FOR SERVICE TECHNICIAN'S USE ONLY
Electrical Shock Hazard
check the magnetron, waveguide 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 by
procedures described in service manual
before the oven is released to the owner.
e. A microwave leakage check to verify
compliance with the 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
window area of the door is broken.
2. Place the beaker in the center of the oven.
3. When done, stir the thermometer through
4. Subtract the cold water temperature from
Recommended Repair Procedure
After a power failure, the colon ":" will be flashing. Press any key to
end this indication. The colon will then be steady when in stand-by.
Replace membrane switch. If problem persists, replace control board.
Check wiring to relay 4903 for short circuits. If wiring is OK, replace
control board.
Operate on HIGH power level for
60 seconds.
the water and record the temperature.
the warm water temperature to get the
temperature rise. Normal range is as
shown in the following table:
Voltage
(VAC under load)
120V
108V
PART NO. 8184997/4619-651-98301
PAGE 1
Temperature Rise
°C °F
12 - 13 21 - 24
10 - 11 18 - 19