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 filament
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.
*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 insulation 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
magnetron
Replace
high voltage
transformer
Replace
high voltage
diode.
Replace high voltage
transformer
Replace
magnetron
