LG MH-1355M Service Manual page 33

CONDITION
MICROWAVE
Oven does not go into a cook
cycle when Start pad is
touched.
Output power is too low.
Output is too high when you
set lower power level.
Sparks occuring.
Uneven cooking.
CAUSE
Primary and/or secondary
interlock switches defective or
out of adjustment.
Defective relay 1 of P.C.B.
Defective membrane 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 1 or 3 of P.C.B.
Defective relay 1 of P.C.B.
High AC input voltage.
Using metallic ware and
allowing it to touch the oven
wall.
Ceramic ware trimmed in gold
or silver powder is used.
Inconsistent intensity of
microwave due to their
characteristics.
Food does not turn during
cooking cycle.
Turntable motor does not
operate.
– 33 –
TEST PROCEDURE OR
CORRECTION
Test procedure primary and
secondary switches.
(See page 25.)
Test procedure relay 1 of P.C.B.
(See page 40.)
Test procedure membrane key
of P.C.B. (See page 41.)
Check and repair wiring.
Test procedure fan motor.
(See page 38.)
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
time period.
Test procedure relay 1 and 3 of
P.C.B. (See page 40.)
Test procedure relay 1 of P.C.B.
(See page 40.)
Use the microwave oven at
adequate line voltage.
Do not use metallic ware for
cooking, except where noted in
the cookbook.
Do not use any type of
cookware with metallic trimming.
1. Wrap the thinner food with
aluminum foil.
2. Use plastic wrap or with a lid.
3. Stir once or twice while cooking
soup, cocoa or milk etc.
Food or cookware extending
oven edges of turntable prevents
turning; rearrange food.
Refer to preceding turntable
motor problem.