R-9380
SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful to
follow the Sequence of Operation in performing the checks.
Many of the possible causes of trouble will require that a
specific test be performed. These tests are given a procedure
letter which will be found in the “Test Procedures section.”
IMPORTANT: If the oven becomes inoperative because of a
blown fuse in the monitor-upper latch switch
circuit, check the monitor switch and upper
latch switch before replacing the fuse.
PROBLEM
POSSIBLE CAUSE
TEST PROCEDURE OR
CORRECTION
OFF CONDITION
Home fuse blows when power cord
is plugged into wall receptacle.
Shorted wire in power cord or wire harness.
Replace cord or check wiring.
Fuse M6.3A blows when power
cord is plugged into wall
receptacle.
Shorted wire in power cord or wire harness.
Replace power cord or check
and repair wire harness.
Defective monitor switch.
Procedure G.
” 88:88 ” does not appear in display
when power cord is first plugged
into wall outlet.
No power at outlet.
Check home fuse.
No power from service entrance.
Check wall outlet.
Open wire in power cord or wire harness.
Blown fuse M6.3A.
Defective temp. fuse.
Replace same or repair wiring.
Procedure H.
Procedure F.
Defective thermal cut-out.
Open wire In power cord, wiring harness,
or wrring between control panel assembly
unrts.
Procedure I.
Replace or repair wiring.
Defective control unit.
Procedure J.
Display does not operate properly
Defective key unrt.
Procedure J.
when STOP/CLEAR key is touched.
’
(Buzzer should sound and time of
Defective stop switch.
Procedure E.
day should appear in display.)
Defective control unit.
Procedure J.
Oven lamp does not light with
Defective oven lamp.
-_
door opened.
Replace oven lamp.
Defective stop switch.
Procedure E.
Defective control unit.
Procedure J.
Open or loose wire connection to the above
Check wiring.
components.
COOKING CONDITION
Oven lamp does not light in cook
cycle.
(Do light when door is opened.)
Defective relay RY-1 on control unit.
Procedure J.
I
I
7
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