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SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is
helpfull to follow the Sequence of Operation in per-
IMPORTANT: lf the oven becomes inoperative be-
cause of a blown fuse in the monitor
forming 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 Procedure”section.
switch and upper latch switch circuit,
check the monitor switch and upper
latch switch before replacing the fuse.
If the fuse is replaced, the monitor
switch should be replaced at same
time.
(RD8’ll OZU)
PROBLEM
POSSIBLE CAUSE
TEST PROCEDURE OR
CORRECTION
OFF CONDJTION
Home fuse blows when power
cord is plugged into wall recepta-
Shorted wire in power cord or wire har-
ness.
Replace cord or check wiring.
cle.
Fuse blows when power cord is
plugged into wall receptacle.
Shorted wire in power cord or wire har-
ness.
Replace power cord or check
and repair harness.
Defective monitor switch.
Procedure F.
88:88 do not appear in display No power at outlet.
when power cord is first plugged
Check home fuse.
Blown fuse.
into wall outlet.
Procedure G.
Blown magnetron temp. fuse.
Procedure H.
Defective thermal cut-out.
Procedure I.
Open wire in power cord, wiring harness,
or wrrrng between control panel assembly
Replace or repair wiring.
units.
Defective CPU unit.
Procedure 0.
Defective relay unit.
Procedure N.
Display does not operate properly
when STOP/CLEAR
Defective key unit.
key is
Procedure P.
touched. (B
uzzer should sound
Defective CPU unit.
Procedure 0.
and time of day should appear in
Defective relay unit.
Procedure N.
display.)
Defective stop switch.
Procedure E.
Oven lamp does not light with No power in home.
door opened.
Check wall outlet.
, Open wire in power cord or wire harness. , Replace same or repair wir- 1
rng.
Defective oven lamp.
-*
Replace.
Defective upper latch switch.
Procedure E.
Blow fuse.
Procedure G.
Defective thermal cut-out.
Procedure I.
Defective magnetron temp. fuse.
Procedure H.
Open or loose wire connection to the Check wiring.
above components.
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