19
Replace or repair oven lamp,
turntable motor.
Replace high
voltage
transformer.
NO
NO Continuity
Replace high
voltage
diode.
Continuity in
the reverse
direction.
Replace
magnetron.
Replace high
voltage
transformer.
NO Good
Replace
magnetron.
NO Continuity
YES
YES
Poor continuity
Continuity
Continuity
Does the fan motor work when you
shut the door and turn the timer?
Does the oven lamp light?
Does the turntable turn?
If microwave do not o
scillate, check continuity o f
filament of magnetron.
Check the isolation o f
filament winding of h igh
voltage transformer.
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
the d iode.
Normal
reading should
be approx. 0
Ω
