TROUBLESHOOTING GUIDE (CONT’D)
PROBELM
POSSIBLE CAUSE
TEST PROCEDURE OR
CORRECTION
MICROWAVE COOKING CONDITION
Oven lamps do not light in cook
cycle.
(Does light when door is opened)
Defective contacts (A) of shut-off relay
(RY2) on relay unit.
Defective control unit.
Procedure
0.
Procedure L.
Oven lamps do not light at all.
Burned out bulb.
Replace.
Open wiring to oven lamp.
1
Check and repair wiring.
Oven lamps light, but turntable
motor do not operate.
Defective contacts (B) of shut-off relay
(RY2) on relay unit.
Procedure Q.
Cook indicator lights on display
Defective turntable motor.
Defective control unit.
Replace.
Procedure L.
but cooling fan motor do not
operate.
Defective contacts of shut-off relay
(RY3) on relay unit.
Procedure Q.
Defective cooling fan motor.
Open or loose wiring between above
components.
Replace.
Check and repair wiring.
Oven does not go into a cook
cycle when COOK key is
touched.
Primary and/or secondary interlock
switches defective or out of
adjustment.
Procedures E and F.
I
Defective magnetron therm0 cut-out.
1
Procedure I.
Defective cook relay.
Defective control unit.
Procedure J.
Procedure L.
Defective key unit.
Procedure L.
.
Defective relay unit.
Open or loose wiring to above
components.
Procedure Q.
Check and repair wiring.
Oven seems to be operating
I
Defective magnetron therm0 cut-out.
I
Procedure I.
but little or no heat is
produced in oven load.
(Food incompletely cooked or
/
Defective relay unit.
-<
)
Procedure Q.
qot
cooked at all at end of
zook
cycle)
Defective cook relay.
Defective power transformer.
Procedure J.
Procedure 8.
Defective rectifier.
Procedure C.
I
Defective high voltage capacitor.
I
Procedure D.
Defective control unit.
Open or loose wiring to above
components.
Procedure L.
Check and repair wiring.
&en
goes into a cook cycle but
extremely
uneven heating is
3roduced
in oven load (food).
Turntable motor does not operate.
Refer to proceeding turntable
motor problem.
52
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