Chapter 7. Troubleshooting Guide - Sharp R-380LS Service Manual

R380L(W)
CHAPTER 7.
R380L(W)
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 Pro-
cedure"section.
TEST PROCEDURE
POSSIBLE CAUSE
DEFECTIVE PARTS
PROBLEM
CONDITION
Home fuse blows when power
supply cord is plugged into wall
outlet.
FUSE F10A blows when power
supply cord is plugged into wall
outlet.
Display does not show anything
OFF
CONDITION
when power supply cord is plug-
ged into wall outlet.
Display does not operate proper-
ly when STOP/CLEAR pad is
touched.
Oven lamp does not light at door
opened. (Display appears.)
Oven does not start when the
START pad is touched.
play appears)
Oven lamp does not light (Dis-
play appears.)
Fan motor does not operate.
(Display appears.)
Turntable motor assembly does
not operate. (Display appears.)
Oven or any electrical parts does
not stop when cooking time is 0
or STOP/CLEAR pad is touched.
Oven seems to be operating but
ON
little or no heat is produced in
CONDITION
oven load. (Microwave power lev-
el is set at 100%)
Oven does not seems to be oper-
ating properly when 70%, 50%,
30% or 10% is set. (Oven oper-
ates properly at 100% and then
the STOP/CLEAR pad is touched
the oven stops.)
Oven goes into cook cycle but
shuts down before end of cook-
ing cycle.
AH sensor does not end during
Sensor cooking condition. (Oven
SENSO
doesnot shut off after a cup of wa-
RCOOKING
ter is boiling by sensor cooking.)
CONDITION
Oven stops at 16 sec. after starting.
A B C D E
AND
(Dis-
Service Manual
IMPORTANT:
If the oven becomes inoperative because of a blown fuse F10A in the
1st. latch switch - 2nd. interlock relay - monitor switch circuit, check the
1st. latch switch, 2nd.interlock relay and monitor switch before replac-
ing the fuse F10A.
E E F G G H K L M N
7 – 1
CK = Check / RE = Replace
I J O
RE CK CK RE CK CK CK CK CK