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(TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITION
No
microwave
oscillation
Check continuity of high voltage
rectifier in forward and backward
Connect megger leads to mag-
netron terminal and magnetron
Check resistance of primary and
secondary coil of high voltage
Check continuity of magnetron
Check continuity of filament termi-
nal of high voltage transformer
Check D.C. voltage being sup-
CHECK
Check continuity of high
voltage fuse
Replace high voltage fuse
Check continuity of high
voltage capacitor terminals
with wires removed
direction with DC megger
body
transformer
with wires removed
plied to RELAY (RY1) coil
RESULT
Continuity
Continuity
Defective high
Continuity in
Defective high
backward
voltage rectifier
direction
Continuity
Defective mag-
0 Ωor ∞
Defective high
No
Defective mag-
Continuity
No
Defective high
Continuity
0 V
Defective touch
Approx
15 VDC
RELAY (RY1)
or open relay coil
20
CAUSE
REMEDY
Replace
voltage trans-
former
Replace
Replace
netron
Replace
voltage trans-
former
Replace
netron
Replace
voltage trans-
former
Replace
control circuit
Replace
Faulty
contacts or
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