LG MS2548GR Service Manual page 25

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run.
(Display operates properly)
CONDITION
No microwave
oscillation.
LGE Internal Use Only
CHECK
Disconnect the No continuity.
wire leads from
relay 2 and
check continuity
Continuity.
of relay2.
(Operate the unit)
Check circuit
Abnormal
protector.
Normal
Check high vol-
Abnormal
tage transformer.
Normal
Check high vol-
Abnormal
tage capacitor.
Normal
Check high vol-
Abnormal
tage diode.
Normal
Check
Abnormal
magnetron.
RESULT
Defective PCB
assembly.
Defective circuit
protector.
Defective high
voltage
transformer.
Defective high
voltage capacitor.
Defective high
voltage diode.
Defective
magnetron.
5-15 Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CAUSE REMEDY
Replace PCB
assembly.
Replace circuit
protector.
Replace high
voltage
transformer.
Replace high
voltage capacitor.
Replace high
voltage diode.
Replace
magnetron.