Inspection After Repairing - Sharp KSH-777DW Service Manual

Commercial rice cooker

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Operation manual (8 pages)

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Table of Contents

KSH-777DW

Basic requirement for cooking is to maintain the close contact of inner bowl bottom with heating plate and thermostat.

As the RICE COOKER is of direct heating type, when the temperature of inner bowl bottom reaches 145˚C to 155˚C, the

thermostat wick operate to provide change-over to warm-keeping automatically.

Therefore, the cooker can be put in use in an excellent condition if the bowl bottom is kept contact closely with the heating

plate and put in a stable, state.

It is the basic requirement for direct heating type cooking.

Accordingly, if the cooker is used under the unstable state of close contact, it will become the causes of early power OFF,

discoloration and deformation of heating plate, or other troubles.

Also, any deformed or contaminant-deposited inner bowl and heating plate may lead to early power OFF or other troubles.

Further to the above, this RICE COOKER is so designed that the cooking switch will not be put in "Cook" position whenever

the inner bowl taken off or not set into the cooker before use, hence this point must be well noted when adjusting the switch.

Upon completion of preparing work, inspect the cooker as to the following points without fail.

Inner bowl to be normally in contact with the heating plate

Inner bowl

Heating plate

Thermostat

Fig. I-1

Center adjustment and confirmation of lever

1. For the center adjustment, align not with the thermo rod, but with the hole of the body. (Carry out this work with the

greatest care).

2. Adjust in such a manner that, when the switch lever held by hand as in Fig. I-2 is lightly swung to the left and right, it

moves in a perfect symmetry with respect to the hole of the body.

3. This switch button should be at the center of the control panel hole.

Verification of Work and Function

1. Is there any part left uninstalled or any wrong wiring ?

2. Is the center adjustment of the switch lever as specified ?

3. Finally, energize for confirmation (RICE COOKER should be checked in a horizontal position)

a. Is the state "Switch-Off" achieved when the inner bowl is detached, with the cooking switch set to "Cook" ?

b. Does indicator light not flicker when the switch button is gently vibrated, with the switch set to "Cook"?

c. Is there no possibility that the cooking switch is turned ON, even when the switch button is depressed without placing

the inner bowl ?

d. Is the thermostat functioning perfectly ?

e. Does the indicator light come on normally ?

Measurement of Insulation Resistance

1. Insulation resistance should be more than 1MΩ upon measurement by a D.C.500V merger (to be effected before and

immediately after the temperature test).

2. Dielectric strength should be free from defects at AC 1000V for one min. (to be carried out after the insulation resistance

measurement which is taken immediately after the temperature test).

Stop to be measured with the cooking switch set to "Cook", take measurements on the blades of the plug socket and

heating plate.

Temperature Test

Based on the testing method explained earlier, ensure proper performance for "Cook".