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(TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITION
No
microwave
oscillation
voltage rectifier in forward and
supplied to RELAY (RY1) coil
1 Check resistance of primary
1 Check resistance of filament
2 Check continuity of mag-
CHECK
Check continuity of high
voltage fuse
No microwave oscillation
Check continuity of high
voltage capacitor terminals
with wires removed
Check continuity of high
backward direcition with DC
megger
Connect megger leads to
magnetron terminal and
magnetron body
Check D.C voltage being
and secondary coil of high
voltage transformer
terminal of high voltage
transformer
netron heater with wires
removed
RESULT
No Continuity
Defective high
Continuity
Defective high
Continuity in
Defective high
backward
voltage rectifier
direction
Continuity
Defective mag-
0 V
Defective touch
Approx
Faulty contacts of
24V DC
RELAY (RY1) or
open relay coil
0 Ω or ∞
Defective high
No continuity
Defective high
No continuity
Defective mag-
25
CAUSE
REMEDY
Replace
voltage fuse
voltage trans-
former
Replace
netron
Replace
control circuit
Replace
Replace
voltage trans-
former
Replace
voltage trans-
former
Replace
netron
1
2
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