Daewoo KOR-6L5K5S Service Manual page 21

(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
Check continuity of filament termi-
Check D.C. voltage being sup-
CHECK
Check continuity of high
voltage capacitor terminals
with wires removed
direction with DC megger
body
secondary coil of high voltage
transformer
Check continuity of magnetron
with wires removed
nal of high voltage transformer
plied to RELAY (RY1) coil
RESULT
Continuity
Continuity in
backward
direction
Continuity
0 Ω or ∞
No
Continuity
No
Continuity
0 V
Defective touch
Approx
15 VDC
20
CAUSE
Defective high
voltage trans-
former
Defective high
voltage rectifier
Defective mag-
netron
Defective high
voltage trans-
former
Defective mag-
netron
Defective high
voltage trans-
former
control circuit
Faulty
contacts or
RELAY (RY1)
or open
relay coil
REMEDY
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace