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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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