LG MS-304W - Microwave Oscillation Troubleshooting; No Microwave Oscillation

5-15
CONDITION CHECK RESULT CAUSE REMEDY
No microwave
oscillation.
No continuity.
Continuity.
Defective P.C.B
assembly
Replace P.C.B
assembly
Disconnect the
wire leads from
relay 2 and
check continuity
of relay2.
(Operate the
unit)
Abnormal
normal
Defective high
voltage
transformer.
Replace high
voltage
transformer .
Check H.V.
transformer.
normal
normal
Abnormal
Defective high
voltage Diode.
Replace high
voltage Diode.
Check H.V.
diode.
Abnormal
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Check H.V.
capacitor.
Abnormal
Defective
magnetron.
Replace
magnetron .
Check
Magnetron.
(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run
(Display operates properly)