Daewoo KOG-366T0S, Service Manual, Page: 37 / 56

36
(TROUBLE4) No microwave oscillation even though fan motor rotates.
Check Result
Cause Remedy
Check continuity
of high voltage
fuse
Condition
No microwave
oscillation
No
continuity
Check continuity
of high voltage
capacitor
terminals with
wires removed Continuity Defective high
voltage
transformer Replace
Check continuity
of high voltage
recitifier in forword
and backward
direcion with DC
meggr Continuity
inbackward
direction Defective high
voltage voltage
rectifier Replace
Connect megger
leads to
magentron
terminal and
magnetron body Continuity Defective
magnetron Replace
Check resistance
of primary and
secondary coil of
high voltage
transformer 0 or Defective high
voltage
transformer Replace
Check continuity
of magnetron
heater with wires
removed No
continuity Defective high
voltage
transformer Replace
Check continuity
of filament
terminal of high
voltage
transformer No
continuity Defective high
voltage
transformer Replace
Approx
-16V DC Faulty contacts
of
RELAY(RY1)
or open relay
coil Replace
Check D.C.
voltage being
supplied to
RELAY (RY1) coil 0V Defective touch
control circuit Replace