Frigidaire MFM-6D Service Manual page 40

Condition
Turn table motor
fan motor and
oven lamp turn
on for a
second when
the start pad
is tapped
(TROUBLE 5) No microwave oscillation even though fan motor rotates.
Condition
No microwave
oscillation
39
Check
Check continuity
of primary winding
of high voltage
transformer and
touch control
circuit
Check
Check continuity
of connecting wire
of magnetron.
Check the isolation
of filament winding
transformer
Check continuity
of filament of
magnetron.
Check continuity
of filament terminal
of high voltage
transformer
Check the diode
for continuity
and normal
directions
Result
No
Open winding
Continuity
Defective touch
Normal
control circuit
Result
Continuity
No
Defective
Good
high voltage
transformer
Good
Defective
magnetron
No
Continuity
No
Defective
Continuity
magnetron
Continuity
No
Defective
Continuity
high voltage
transformer
Continuity
Continuity
Defective
in the
high voltage
reverse
diode
direction
Cause Remedy
Cause Remedy
Replace
Replace
Replace
Replace
Replace
Replace
Replace