Daewoo KOR-616T2S Service Manual page 36

(TROUBLE 4) No microwave oscillation even though fan motor rotates.
Condition
No microwave
oscillation
Check
Check continuity
of high voltage fuse
Check continuity
of high voltage
capacitor terminals
with wires removed
Check continuity
of high voltage
recitifier in forward
and backward
direction with
DC meggr
Connect megger
leads to magnetron
terminal and
magnetron body
Check resistance
of primary and
secondary coil of
high voltage
transformer
Check continuity
of magnetron heater
with wires removed
Check continuity
of filament terminal
of high voltage
transformer
Check D.C. voltage
being
supplied to RELAY
(RY1)coil
Result
No
Continuity
Continuity Defective
high voltage
transformer
Continuity
Defective
in backward
high voltage
direction
rectifier
Continuity Defective
magnetron
0 Ω or
Defective
high voltage
transformer
Defective
No
magnetron
Continuity
No
Defective
Continuity
high voltage
transformer
Defective touch
0V
control circuit
Approx.
Faulty contacts of
-24V DC
RELAY(RY1) or
open relay coil
35
Cause Remedy
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace