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Does the oven lamp light?
Does the turntable turn?
YES
YES
Continuity
Does the fan motor work when you
shut the door and turn the timer?
Check the isolation of filament
winding of high voltage
transformer.
Replace high voltage
transformer.
NO Continuity
Replace magnetron
Good
Replace or repair oven lamp,
turntable motor.
NO
If microwave do not
oscillate, check continuity
of filament of magnetron.
Poor continuity
NO
Continuity
Check continuity
filament tap (3.3V)
of high voltage transformer.
of high voltage transformer.
Replace high
voltage transformer
No Continuity
Continuity
Check continuity
filament tap (3.3V)
Replace high
voltage diode
Continuity in
the reverse
direction.
Replace magnetron
Normal reading
should be
approx. 0
Meter with 600V or higher
voltage Meger should
be used to check the normal
direction resistance of
the diode
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