Daewoo KOG-8465 - Trouble 3: No Microwave Oscillation

24
Fuse blows
(COM¡ŒNC)
Condition
No microwave
oscillation
No
Continuity
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
direction with DC megger
Continuity
in backward
direction
Defective high
voltage rectifier
Connect megger
leads to magnetron
terminal and magnetron
body
Continuity
Defective
magnetron
Check resistance of
primary and secondary
coil of high voltage
transformer
0 Ω or ∞
Defective high
voltage
transfromer
Defective high
voltage
transfromer
Defective timer
ass’y
Check continuity
of magnetron heater
with wires removed
No
Continuity
No
Continuity
No
Continuity
Defective
magnetron
Check continuity
of filament terminal
of high voltage
transformer
Check continuity of
microwave select switch
Continuity
Defective high
voltage
transformer
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Check Result Cause Remedy
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
Replace high voltage fuse