24
Does the fan motor when you shut the door and turn the timer?
YES
YES
NO
continuity
NO microwave
oscillation.
Check continuity
of filament of
magnetron.
Does the oven lamp light?
Does the turntable turn?
2)
Check continuity
of filament of
magnetron
Check continuity fil-
ament tap (3.3V) of high
voltage transformer.
Check the diode for
continuity in the reverse
and normal directions.
*Do not operate when you check this continuity.
*After short the contacts of a relay, operate oven.
*Normal reading should be approx. 0
Ω
.
*Meter with 6V or higher voltage batteries
should be used to check the normal
direction resistance of the diode.
NO GOOD
Poor
continuity
Check the isolation of
filament winding of high
voltage transformer
Faulty magnetron
GOOD
NO
Replace or repair
oven lamp,
turntable motor.
NO
continuity
NO
continuity
continuity
in the
reverse
direction
Replace
magnetorn
Check the relay
contact of slow
acting relay ass'y
NO
operate
Replace
slow acting
relay ass'y
Replace
high voltage
transformer
Replace
high voltage
diode.
Replace high voltage
transformer
Replace
Magnetron
operate
