LG MH-1355M Service Manual page 34

CONDITION
No microwave oscillation.
Oven operates properly on
P-HI but does not cook
properly using another
cooking power.
CAUSE
Child Lock is set.
Defective relay 1 of P.C.B.
Defective high voltage
transformer.
Defective high voltage
capacitor.
Defective high voltage diode.
Defective magnetron.
Low AC input voltage.
Open or loose wiring to above
components.
Defective relay 1 of P.C.B.
Defective membrane key of
P.C.B.
– 34 –
TEST PROCEDURE OR
CORRECTION
This is not a defect.
Touch "0" key pad till a beep
sounds. (See page 14.)
Test procedure relay 1 of P.C.B.
(See page 40.)
Test procedure high voltage
transformer. (See page 36.)
Test procedure high voltage
capacitor. (See page 37.)
Test procedure high voltage
diode. (See page 36.)
Test procedure magnetron.
(See page 36.)
Use the microwave oven at
adequate line voltage.
Check and repair wiring.
Test procedure relay 1 of P.C.B.
(See page 40.)
Test procedure membrane key of
P.C.B. (See page 41.)