Daewoo KOR-616T2S, Service Manual, Page: 36 / 56

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