Troubleshooting Guide - Sharp R-207 Service Manual

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 Procedure" section.
TEST PROCEDURE
POSSIBLE CAUSE
DEFECTIVE PARTS
PROBLEM
CONDITION
Home fuse blows when power
supply cord is plugged into
wall outlet.
OFF
CONDITION
FUSE F1 T6.3A blows when
power supply cord is plugged
into wall outlet.
Oven does not start when the
timer is set.
Oven lamp does not light
(Other function is normal.)
Fan motor does not operate.
(Other function is normal.)
Turntable motor does not op-
erate. (Other function is nor-
mal.)
Oven or any electrical parts
ON
does not stop.
CONDITION
Oven seems to be operating
but little or no heat is produced
in oven load. (Microwave
power level is set at
Oven does not seems to be
operating properly when
560W, 400W,
or 80W is set. (Oven oper-
ates properly at
Oven goes into cook cycle but
shuts down before end of cook-
ing cycle.

TROUBLESHOOTING GUIDE

A B C D E E E F K K I I G L M N
CK
AND
800W)
240W
800W.)
IMPORTANT: If the oven becomes inoperative because
of a blown fuse F1 T6.3A in the monitored
latch switch SW1 - timer switch - monitor
switch circuit, check the monitored latch
switch SW1, timer switch and monitor
switch SW2 before replacing the fuse F1
T6.3A.
9
R-207(IN)
R-207(W)
CK = Check / RE = Replace
H J
RE CKCKRECK CKCKCK CK