Daewoo KOR-1A1G0A Service Manual page 24

(TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITIO N
No microwave
oscillation
CHECK
Check continuity of high
voltage capacitor
terminals with wire s
removed
Check continuity of high
voltage rectifier i n
forward and backward
direction with DC
megger
Connect megger leads to
magnetron terminal and
magnetron bod y
Check resistance of
primary and secondary
coil of high voltage
transformer
Check continuity of
magnetron with wires
remove d
Check continuity o f
filament terminal of hig h
voltage transformer
Check D.C. voltage
being supplied to
RELAY (RY1) coil
RESULT
Continuit y
high voltag
transformer
Continuity in
backwar d
high voltag
direction
Continuit y
magnetron
Or infnity
high voltag
transformer
No
Continuity
No
Continuity
high voltage
transformer
0 V
touch control
Appro x
15 VDC
(RY1) or open
23
TROUBLE SHOOTING GUIDE
REMED Y
CAUSE
Defective
Defective
rectifier
Defectiv e
Defective
Defectiv e
magnetro n
Defectiv e
Defective
circuit
Faulty
contacts o f
RELAY
relay coil
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace