22
Does the fan motor work when you shut the door and turn the timer?
Does the oven lamp light?
Does the turntable turn?
No
Microwave
oscillation
Check continuity
of filament of
magnetron
Check continuity
of filament of
magnetron
Check continuity fil-
ament tap (3.3V) of high
voltage transformer.
Check the diode
for cintinuity
in the reverse
and normal directions.
Check the isolation of
filament winding of high
voltage transformer
Faulty magnetron
Replace
Magnetron
Replace high voltage
transformer
Replace
high voltage
transformer
Oven does not work
NO GOOD
GOOD
* Meter with 6V or higher voltage batteries
should be used to check the normal
direction resistance of the diode.
* Normal reading should be approx. 0
Ω
Continuity
in the
reverse
direction
No
continuity
No
continuity
Check the relay
contact of slow
acting relay ass’y
No
operate
No
operate
operate
NO
YES
YES
* Do not operate when you check this
continuity.
* After short the contacts of a relay, operate oven.
No
continuity
Poor
continuity
Replace
Magnetron
Replace slow acting
relay ass’y.
Replace high
voltage diode.
