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