Sharp R-520LK, R-520LW CK = Check / RE = Replace, CK CK CK, I , CK, , RE RE, A B C D E E F F G H , RE RE, TEST PROCEDURE, , PROCEDURE LETTER COMPONENT TEST , PROBLEM, J K L M N

R-520LK

R-520LW

A MAGNETRON ASSEMBLY TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high voltage capacitor.

TEST PROCEDURES

PROCEDURE LETTER COMPONENT TEST

Home fuse or circuit breaker blows

when power cord is plugged into wall

receptacle

C/T fuse blows when power cord is

plugged into wall receptacle.

All letters and indicators do not ap-

pear in display when power cord is

ﬁrst plugged into wall outlet.

Display does not operate properly

when STOP/CLEAR key is touched.

(Buzzer should sound and ":" or time

of day should appear in display.)

Oven lamp does not light when door

is opened.

Oven lamp does not go out when

door is closed.

Oven lamp lights but fan motor and

turntable motor do not operate.

Oven does not go into cook cycle

when START pad is touched

Oven seems to be operating but little

or no heat is produced in oven load.

(Food incompletely cooked or not

cooked at all at end of cook cycle.)

Oven goes into a cook cycle but ex-

tremely uneven heating is produced

in oven load (food).

Oven does not cook properly when

programmed for Cooking Power P-50

mode. (Operates properly on Cooking

P-HI (HIGH) mode.)

Oven goes into COMPU DEFROST

but food is not defrosted well.

AH sensor does not end during

sensor cooking condition. (Oven

does not shut off after a cup of

water is boiling by sensor cooking)

Oven stops at 16 sec. after starting.

OFF

CONDITION

PROBLEM

CONDITION

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

TEST PROCEDURERE RE A B C D E E F F G H RE RE CK I CK CK CK J K L M N

COOKING

CONDITION

SENSOR

COOKING

CONDITION

SHORT IN POWER CORD

SHORT OR OPENED WIRING

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

CAVITY TEMPERATURE FUSE

MAGNETRON TEMP FUSE

SECONDARY INTERLOCK SYSTEM

PRIMARY INTERLOCK SWITCH

MONITOR SWITCH

MONITOR FUSE

OVEN LAMP OR SOCKET

COOLING FAN MOTOR

TURNTABLE MOTOR

TOUCH CONTROL PANEL

WRONG OPERATION

LOW VOLTAGE

DIRTY OVEN CAVITY

KEY UNIT

RELAY (RY1)

COMPU DEFROST

FOIL PATTERN ON PWB.

AH SENSOR

CK = Check / RE = Replace