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(TROUBLE4) No microwave oscillation even though fan motor rotates.
Condition
No microwave
oscillation
Check
Check continuity
of high voltage
fuse
Check continuity
of high voltage
capacitor
terminals with
wires removed
Check continuity
of high voltage
recitifier in forword
and backward
direcion with DC
meggr
Connect megger
leads to
magentron
terminal and
magnetron body
Check resistance
of primary and
secondary coil of
high voltage
transformer
Check continuity
of magnetron
heater with wires
removed
Check continuity
of filament
terminal of high
voltage
transformer
Check D.C.
voltage being
supplied to
RELAY (RY1) coil
Result
No
continuity
Continuity
Defective high
voltage
transformer
Continuity
Defective high
inbackward
voltage voltage
direction
rectifier
Continuity
Defective
magnetron
0 or
Defective high
voltage
transformer
No
Defective high
continuity
voltage
transformer
No
Defective high
continuity
voltage
transformer
0V
Defective touch
control circuit
Approx
Faulty contacts
-16V DC
of
RELAY(RY1)
or open relay
coil
36
Cause
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Remedy
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