R-7280
R-1720
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
4
Home fuse blows when power cord
is plugged into wall receptacle.
Oven fuse blows when power cord
is plugged into wall receptacie.
” 88:88 ” does not appear in display
when power cord is first plugged
into wail outlet.
7
Display does not operate properly
when STOP/CLEAR key is touched.
(Buzze should sound and time of
day should uppar in display.)
Oven lamp does not light with
door opened.
OFF CONDITION
Shorted wire in power cord or wire harness.
Shorted wire in power cord or wire harness,
Oefective monitor switch.
NO power at outlet.
No power from service entrance.
Open wire in power cord or wire harness.
Blown fuse.
Defective temp. fuse.
(magnetron and oven)
Open wire In power cord, wrrmg harness,
or wrring between control panel assembly
unrts.
Replace cord or check wiring.
Replace power cord or check
and repair wire harness.
Procedure H.
Check home fuse.
Check wall outlet.
Replace same or repair wiring.
Procedure I.
Procedure G.
Replace or reparr wiring.
Defective controi unit.
Procedure J.
Defective key untt. Procedure J.
Defective stop switch.
Procedure F.
Defective control unit.
Procedure J.
Defective oven lamp.
Replace oven lamp.
Defective stop switch.
Procedure F.
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.
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