Sharp KS-R19S, Service Manual

13

Pot Bottom

Bubbles

In case satisfactory cooking of rice is not accomplished (excessively overdone or underdone), conduct the

temperature test in accordance with the following procedure.

Simplified Testing Method (Simulated Rice-Cooking)

1.  Testing conditions

     a.  Power voltage 220V.

     b.  Fill inner pot with 180 ml. of water. (Water temperature to be the same as ambient temperature.)

     c.  Ambient temperature to be 20 to 30

o

C.

     d.  JAR RICE COOKER to be sufficiently kept cooled (Cooker body temperature to be the same as ambient

    temperature.)

     e.  Never fail to set the inner lid.

2.  Testing procedure

     a.   Fill the inner pot with 180 ml. of water turn ON the cooking switch (for cooking purpose) to energize the

           cooker and measure the time for cooking.

     b.   When steam comes out of the steam vent, open the lid and check the bubbling state on the bottom

           of inner pot. (Check if the inner pot is allowed to be in close and stable contact with the heater plate ass’y.

           Conduct checking within a short period of time so as not to influence over the operating time.)

      c.  Where the bubbling state is satisfactory, close the lid again and energize the cooker.

SIMPLIFIED TESTING METHOD

3.  Judgement criteria

     During the course of the simulated cooking with water conducted under the conditions as above, the rice cooker

     if meeting the following requirements, will be considered acceptable.

     a. If the bubbling state is such that bubbles occur evenly around the bottom of inner pot as shown in

Fig. 19(A), the inner pot is satisfactorily in contact with the heater plate ass’y. Where bubbles do not occur

more than 1/3 of the bottom periphery as shown in Fig. 19(B), contaminant deposits on the heater plate ass’y

or deformation or damage on the inner pot may be existing. (Though such contaminant deposits can be

removed by cleaning, the inner pot deformed to the extent hardly rectified should be replaced with new one.

The same applies to the heater plate ass’y deformed.)

Good State of Bubbling

(A)

Poor State of Bubbling

(B)

Fig. 19

Fig. 18

Lid

Inner pot

Water for testing

Thermostat ass’y

Inner lid

Heater plate ass’y