R-291KM - Sharp Home Appliance Service Manual (repair manual). Page 13

R-291(K)M

8 – 3

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.

CARRY OUT 4R  CHECKS.

CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the temperature fuse. Then using an ohmmeter, make a continuity test across the two terminals as
described in the below.

If incorrect readings are obtained, replace the temperature fuse.

g produced by

improper setting of the cooking time or failure of the control panel.

CARRY OUT 4R  CHECKS.

CARRY OUT 3D CHECKS.

Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below.

If incorrect readings are obtained, replace the motor.

CARRY OUT 4R  CHECKS.

CARRY OUT 3D CHECKS.

If the fuse T6.3A is blown when the door is opened, check the monitored latch switch, relay (RY1), timer switch and monitor switch.

If the fuse T6.3A is blown by incorrect door switching replace the defective switch(es) and the fuse T6.3A.

If the fuse T6.3A is blown, there is a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the
wire harness.

CARRY OUT 4R  CHECKS.

CAUTION: ONLY REPLACE FUSE T6.3A WITH THE CORRECT VALUE REPLACEMENT.

CARRY OUT 3D CHECKS.

Check them and replace the defective parts and the high voltage fuse.

CARRY OUT 4R  CHECKS.

CAUTION: ONLY REPLACE HIGH VOLTAGE FUSE  WITH THE CORRECT VALUE REPLACEMENT. 

Table: Temperature Fuse Test

Parts Name

Temperature of “ON” condition 

(closed circuit).

Temperature of “OFF” condition 

(open circuit).

Indication of ohmmeter (When room 
temperature is approx. 20

C.)

Temperature fuse 150

C

This is not resetable type.

Above 150

t

i

u

c

r

i

c

 

d

e

s

o

l

C

C

Table: Resistance of Motor

Motors

Resistance

Fan motor

Approximately 250 

Turntable motor

Approximately 14.7 k