Servicing - Sharp R-9360 Service Manual

R-9360
SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful to fol-
low 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 monitor fuse in the upper latch switch-
monitor-switch circuit, check the upper latch
switch and monitor switch before replacing the
monitor fuse.
PROBLEM
POSSIBLE CAUSE
TEST PROCEDURE OR
CORRECTION
OFF CONDITION
Home fuse blows when power cord
Shorted wire in power cord or wire harness. Replace cord or check wiring.
is plugged into wall receptacle.
Monitor fuse blows when power
Shorted wire in power cord or wire harness. Replace power cord or check and
cord is plugged into wall receptacle.
repair wire harness.
Defective monitor switch. Procedure F.
88:88 do not appear in display
No power at outlet.
Check home fuse.
when power cord is first plugged
into wail outlet.
Blown monitor fuse. Procedure G.
Blown magnetron temp. fuse. Procedure H.
Open wire in power cord, wiring harness, Replace or repair wiring.
or wiring between control panel assembly
units.
Display does not operate properly
when STOP/CLEAR key is touched.
(Buzzer should sound and time of
day should appear in display.)
&en lamps do not light with
door opened.
Defective control unit. Procedure I.
Defective key unit. Procedure J.
Defective control unit. Procedure I.
Defective stop switch. Procedure E.
No power in home. Check wall outlet.
Open wire in power cord or wire harness.
Defective oven lamp.
Defective lower latch switch.
Open or loose wire connection to the
above components.
Replace same or repair wiring.
Replace.
Procedure E.
Check wiring.
Blown monitor fuse or magnetron temp.
fuse.
Procedure G or H.
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