Sharp R-8380 Service Manual page 13

PROBLEM
POSSIBLE CAUSE
TEST PROCEDURE OR
CORRECTION
COOKING CONDITION
Oven lamp does not light in cook
Defective contacts of shut-off relay (RY4)
Procedure N.
cycle. (Does light when door is on
Control
unit.
opened)
Defective control unit.
Procedure 0.
Oven lamp does not light at all.
Burned out bulb.
Replace.
Open wiring to oven lamp socket.
Check and repair wiring.
Oven lamp lights, but turntable Defective turntable motor.
Replace.
motor does not operate.
Open or loose wiring to turntable motor
Check and repair wiring.
and lower latch switch.
Defective lower latch switch.
Procedure E.
Turntable motor operates normally
Defective cooling fan motor.
Replace.
but cooling fan motor does not Defective shut-off relay (RY2) on control Procedure N.
operate.
unit.
Open or loose wiring to above compo- Check and repair wiring.
nents.
MICROWAVE COOKING
1 Oven does not go into a cook cy-
Upper latch, lower latch and/or stop Procedures E or adjust them.
/ cle when START pad is touched.
switches defective or out of adjustment.
Defective micro relay.
Procedure M.
Defective control unit.
Procedure 0.
Defective key unit.
Procedure 0.
1
Open or loose wiring to above compo- Check and repair wiring.
nents.
1
1
/
I Oven seems to be operating but Defective magnetron.
~ little or no heat is produced in j Defective micro relay.
oven load.( Food incompletely
cooked or not cooked at all at end
of cookcycle)
Defective power transformer.
/ Defective high voltage rectifier assembly.
/ Procedure B.
I
I Procedure C.
j Defective high voltage capacitor.
,! Defective control unit.
Procedure A.
/ Procedure M.
**
1 Procedure D.
/ Procedure 0.
Open or loose wiring to above compo- / Check and repair wiring.
nents. Low voltage. Dirty oven cavity.
/
/
,
Oven goes into a cook cycle but
j extremely
Turntable motor does not operate.
/ Refer to preceding turntable '
uneven heating is
i motor problem.
: produced in oven load (food). ;
I Oven does not cook properly ' Defective micro relay. / Procedure M.
I
~ when programmed for MEDIUM Defective control unit.
levels. (Operates Defective key unit,
I Procedure 0.
1
etc. power ,
1 properly on HIGH)
1 Check key unit.
, Open or loose wiring between above Check and repair wiring. /
, components.
Oven does not cook properly Oven does not cook properly Defective EASY DEFROST function. Defective EASY DEFROST function.
! when programmed in the EASY ! when programmed in the EASY
/ Refer to EASY DEFROST / / Refer to EASY DEFROST /
/ section in operation manual. j / section in operation manual. j
DEFROST cooking mode. DEFROST cooking mode.
Defective micro relay. Defective micro relay.
, Procedure M. , Procedure M.
/ /
Defective control unit. Defective control unit.
j Procedure 0. j Procedure 0.
I I
Defective key unit. 1 Check key unit.
/
I
Open or loose wiring between above Check and repair wiring.
components.
j
12