Testing Procedure - Panasonic SR-GA281 Service Manual

5. TESTING PROCEDURE

1. Bubbling Test
Input the pan in the main body and lightly rotate the pan clockwise, and counter clockwise to set the pan on
the heating plate properly.
1. Fill water until the center area of the pan bottom is depped and close the lid. Then turn on the boiling
switch.
2. When it begins boiling to produce steam, remove the lid and immediately check the bubbling condition
on the pan bottom.
3. Bubbling condition is shown in figure 3.
A. Bubbles generate through out the circumference of the pan bottom.....Proper
B. Bubbles does not generate on more than one quater part of the pan bottom circumference.....Improper
Water level
Sheathed heater
If it is improper, it may result from the insufficient contact between the pan bottom and the sheathed heater.
Check the pan bottom and the sheathed heater for foreign material remained. Clean up the foreign materials
or replace the parts.
2. Evaporation Test
1. After satisfactory bubbling is confirmed, remove the lid and put a weight on the cooker.
2. Cover the entire pan bottom with 2 or 3 pieces of tissue paper (or gauze), and turn on the switch
subsequently.
3. The cooker is considered acceptable if the timing when steam generation comes to a stop after water of
the pan bottom has evaporated, is within 1 minute before and after the cooking switch is turned off.
If these requirements are not satisfied, check the center thermostat as well as the contacted condition
between the pan bottom and the cooking heater, and then repair or replace the parts.
5 cm.
Center thermostat
Figure 2
COOK
WARM
A
Pan (viewed from above)
Holes of
tissue paper
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SR-GA281 / SR-GA421 / SR-GA721
Bubbling
B
Figure 3
Pan flange
section
Tissue paper