Sharp R-771 OE User Manual

CHAPTER III
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
IMPORTANT:
If the oven becomes inoperative because
of a blown fuse in the upper latch-
monitor switch circuit, check the upper
latch switch and monitor switch before
procedure letter which will be found in the “Test Procedure
section on this service manual.
replacing the fuse.
I
I
I
I
PROBLEM POSSIBLE CAUSE
TEST PROCEDURE OR
CORRECTION
OFF CONDITION
I
I
I
Home fuse blows when power cord
is plugged into wall receptacle.
Shorted wire in power cord or wire harness.
Replace cord or check wiring.
I
I
Oven lamp doesnot light with door
opened.
(Timer is at “0” position.)
No power from service entrance.
Open wire in power cord or wire harness.
Check wall outlet.
Replace same or repair wiring.
I
I
i
Blown fuse.
Check for short circuit and
replace fuse.
I
Defective oven lamp.
I
Replace both oven lamps.
I
I
I
I
Defective lower latch switch
Procedure J.
Open or loose wire connection to the above
1
Check wiring.
I
Fan motor does not operate. Defective fan motor.
I
Procedure F.
I
Open or loose wire connection.
I
Check wiring.
I
IDLE CONDITION
With the timer set, oven lamp
does not light.
Fan motor does not operate.
Defective oven lamp
Defective timer contacts.
Open or loose wire connection.
Defective fan motor.
Replace both oven lamps.
Procedure G.
Check wiring.
Procedure F.
1
Open or loose wire connection.
Check wiring.
COOKING CONDITION
Cook lamp does not light when
Defective cook switch.
cook switch is pushed.
Replace.
Defective upper latch switch
Procedure I.
Defective lower latch switch Procedure J.
Defective therm0 cut-out.
Defective cook lamp.
Open or loose wire connection to the above
components.
Procedure H.
Replace.
Check wiring.
11

Sharp R-771 OE Specifications

General

Brand	Sharp
Model	R-771 OE
Category	Microwave Oven
Language	English