DAEWOO ELECTRONICS KOG-3C6R - Page 22

19
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
Condition
No
microwave
oscillation
Check Result Cause Remedy
ReplaceCheck continuity
of high voltage
capacitor
terminals with
wires removed
Continuity Defective high
voltage
transformer
ReplaceCheck continuity of
high voltage diode
in forward and
backward direction
with DC megger
Continuity in
backward
diode
Defective high
voltage diode
ReplaceConnect megger
leads to
magnetron
terminal and
magnetron body
Continuity Defective
magnetron
ReplaceCheck resistance
of primary and
secondary coil of
high voltage
transformer
Defective high
voltage
transformer
ReplaceCheck continuity
of magnetron
with wires
removed
No
Continuity
Defective
magnetron
ReplaceCheck continuity
of filament
terminal of high
voltage
transformer
No
Continuity
Defective high
voltage
transformer
ReplaceCheck D.C.
voltage being
supplied to
RELAY (RY1)
coil
0V Defective touch
control circuit
ReplaceApprox
15 VDC
Faulty contacts of
RELAY (RY1) or
open relay coil
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