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Does the fan motor work when you
shut the door and turn the timer?
YES
Does the oven lamp light?
Does the turntable turn?
YES
If microwave do not o
scillate, check continuity o f
filament of magnetron.
Poor continuity
Check the isolation o f
filament winding of h igh
voltage transformer.
NO
reading should
be approx. 0Ω
NO Continuity
Check continuity filament
tap (3.3V) of high voltage.
Check the diode for
continu ity in the reverse
and normal d irections.
Meter with 6V or higher
voltage batteries should
be used to check the normal
direction resistance o f
NO Good
19
Normal
NO Continuity
Continuity
Continuity in
the reverse
direction.
Continuity
the d iode.
Replace or repair oven lamp,
turntable motor.
Replace high
voltage
transformer.
Replace high
voltage
diode.
Replace
magnetron.
Replace high
voltage
transformer.
Replace
magnetron.
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