LG MC-3182NBR Service Manual page 27

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run
(Display operates properly)
CONDITION
No microwave
oscillation.
Check H.V.
transformer.
Check H.V.
capacitor.
Check H.V.
diode.
Check
Magnetron.
CHECK
Disconnect the
No continuity.
wire leads from
relay 2 and
check continuity
Continuity.
of relay2.
(Operate the
unit)
Abnormal
normal
Abnormal
normal
Abnormal
normal
Abnormal
RESULT
Defective P.C.B
assembly
Defective high
voltage
transformer.
Defective high
voltage capacitor.
Defective high
voltage Diode.
Defective
magnetron.
5-17
CAUSE REMEDY
Replace P.C.B
assembly
Replace high
voltage
transformer .
Replace high
voltage capacitor.
Replace high
voltage Diode.
Replace
magnetron.