TECH SHEET - DO NOT DISCARD
PAGE 1
FOR SERVICE TECHNICIAN'S USE ONLY
PART NO. 8184997
/4619-651-98301
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,
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.
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
Display
Likely Failure Condition
Recommended Repair Procedure
Flashing
colon “:”
Power failure
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.
-F2-
Membrane switch failure
Replace membrane switch. If problem persists, replace control board.
-F6-
Microwave relay failure
Check wiring to relay 4903 for short circuits. If wiring is OK, replace
control board.
FAILURE CODES/INDICATIONS
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).
2.
Place the beaker in the center of the oven.
Operate on HIGH power level for
60 seconds.
3.
When done, stir the thermometer through
the water and record the temperature.
4.
Subtract the cold water temperature from
the warm water temperature to get the
temperature rise. Normal range is as
shown in the following table:
Voltage
(VAC under load)
Temperature Rise
°C
°F
120V
12 - 13
21 - 24
108V
10 - 11
18 - 19
