Troubleshooting - Sharp KS-1800 Service Manual

Those marked with black spots (*) are often confused with troubles. Give the customers proper operating
instructions.
1. Trouble during Cooking
Problem
Unable to Cook.
Cook indicator
lamp will not go ON.
Cook indicator
lamp will go ON.
Capable of cooking
Poor fi nish of
but insuffi cient. cooked rice.
(Local unevenness
of cooked rice is
excessive. Core is
left in rice grain due
to early switch OFF.)
Excessively over-
done bottom layer
of rice mass.
(Overdone layer in
light brown is not
regarded as abnor-
mal.)

TROUBLESHOOTING

Possible Cause
* Cook switch kept "OFF".
* Disconnected plug.
Blown-out temperature fuse assembly.
Broken cord reel assembly.
Faulty cord reel assembly.
Faulty or loose wiring.
Faulty micro switch or maladjustment
switch assembly.
Burn-out of heater plate wire.
Faulty wiring.
* Improper quantity of rice or water.
* Faulty tightness due to deformed
heater plate or inner pot bottom.
* Faulty tightness due to contaminants,
etc. deposited on heater plate or inner
pot bottom.
* Failure in complete engagement of
latch.
* Failure in setting inner lid.
Faulty thermostat ass'y.
* Malfunction of thermostat due to
vibration or impact.
* Faulty interlocking of switch
assembly and thermostat ass'y.
* Insuffi cient maintenance of inner pot
or washing of rice.
Improper operating temperature of
thermostat ass'y.
Faulty micro switch or maladjustment
switch assembly. (Cooking will not go
OFF.)
* Cooking has been carried on by
depressing the switch button forcibly
with chopsticks, etc.
17
Corrective Action
* Cook switch "ON".
* Plugged into the wall outlet.
Replace temperature fuse
assembly and faulty parts.
Repair or replace cord reel
assembly.
Repair or replace cord reel
assembly.
Correct wiring.
Repair or replace it.
Replace heater plate.
Repair or replace faulty parts.
* Advise proper operating
instructions.
Replace inner pot or faulty parts.
Remove contaminants or replace
parts having contaminant
deposits.
* Advise proper operating
instructions.
* Advise proper operating
instructions.
Replace thermostat ass'y.
* Advise proper operating
instructions.
Repair.
* Advise proper operating
instructions.
Replace thermostat ass'y. (No
adjustment of operating
temperature is made possible.)
Repair or replace faulty parts.
* Advise proper operation
instructions.