Troubleshooting Guide - Sharp R-24ST 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
AND
DEFECTIVE PARTS
PROBLEM
CONDITION
Home fuse blows when power cord
is plugged into wall outlet.
Fuse F1 blows when power cord
is plugged into wall outlet.
OFF
Oven does not operate at all.
CONDITION
Timer is not set but when door
closed, oven starts operation.
Oven does not start when start
button is pressed, door closed.
Oven lamp does not light, when in
operation.
Fan motor does not operate.
Turntable motor assembly does
not operate.
Oven or electrical parts does not
stop when timer is at "0".
Oven seems to be operating but
little or no heat is produced in oven
load. (Microwave power level is set
at 800W.)
COOKING
CONDITION
Oven does not operate properly during
the variable cooking condition except
800w cooking condition.
Oven goes into cook cycle but
shuts down before end of cooking
cycle.
Oven stops as soon as the oven is
started.
Fan motor, oven
turntable motor do not operate at
the same time.
TROUBLESHOOTING CHART
A B C D
lamp and
R-24ST/R-2B34 - 11
IMPORTANT: If the oven becomes inoperative because of
a blown fuse F. Check the monitored latch
switch and monitor switch before replacing
the F8A fuse.
E E E F G H I I J K L L M