LG MC-784DC Service Manual page 32

(TROUBLE 3) Oven does not operating microwave cooking
CONDITION
Oven does not go into a
cook cycle when START key
is touched.
Ouput power is too low.
Output is too high when you
set lower power level.
Uneven cooking.
CAUSE
Primary and secondary
interlock switches defective
or out of adjustment.
Defective relay 1 of P.C.B.
Defective tact switch key of
P.C.B.
Open or loose wiring to
above components.
Defective fan motor.
Low AC input voltage.
Food temperature is too low.
Defective relay 3 of P.C.B.
Defective relay 1 of P.C.B.
High AC input voltage.
Inconsistent intensity of
microwave by their
characteristics.
Food does not turn during
cook cycle.
Turntable motor does not
operate.
25
TEST PROCEDURE OR
CORRECTION
Test procedure primary and
secondary switches.
Test procedure relay 1 of
P.C.B.
Test procedure tact switch
key of P.C.B.
Check and repair wiring.
Test procedure fan motor.
Use the microwave oven at
adequate line voltage.
This may not be a defect.
It is possible that the food
should be cooked for a
longer period.
Test procedure relay 3 of
P.C.B.
Test procedure relay 1 of
P.C.B.
Use the microwave oven at
adequate line voltage.
1. Wrap the thinner part with
aluminum foil.
2. Use plastic wrap or with a lid.
3. Stir once or twice while
cooking soup, cocoa or milk
Food or cookware extending
oven edges of turntable
prevents turning rearrange
Refer to preceding turntable
motor problem.