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In this case when the switch button is depressed, the following will happen: a. The auxiliary lever will release the micro-switch button. This puts the micro-switch in the cook position. b. The switch lever will push the rod which will allow the magnet to meet with the metal. c. When the rice is cooked and the proper temperature has been reached 134°C ± 6°C, the metal and magnet will pop apart as described in the center thermostat operation above. d. The rod will push the switch lever and cause the auxiliary lever to depress the micro- switch button. This puts the micro-switch in the warming position. 2) When the pan is not in place within the rice cooker, the center thermostat is not depressed. a. In this condition, the outer spring is not compressed within the center thermostat preventing the metal from reaching its normal operating position. b. When the switch button is depressed, the switch lever and auxiliary lever work as above but the magnet cannot come in contact with the metal to hold the switch lever in the cook position. This happens because the switch lever hits the thermostat case and cannot push the rod, with the magnet attached, all they way up to meet with the metal. c. When the pressure is taken off the switch button, the switch lever releases immediately to the open or warm positions. 5 SR-GA421/SR-GA281/SR-GA721 2. FUNCTION OF CENTER THERMOSTAT AND THERMALFUSE C. Thermal Fuse The thermal fuse is used to open the circuit to the cooking heater when the temperature has gone unusually high. This happens in cases such as incomplete contact between the heater and pan or if the switch buttons is forced to stay on keeping the heater energized abnormally. This fuse is not a resetting device and must be replaced after openning. Whenever replacing the fuse make sure the protective cover is placed over all exposed wiring. Cause of Fusion [A] Improper contract between heater and pan Cause Foreign matter adhering Pan collar or deformed Body dented or deformed Pan bottom dented or deformed Heater surface deformed or corroded RemedyRemove foreign matterby of (-) screw-driver, etc., and then polish with= 320 water paper whilewetting it with water. Repair or replace body. Replace pan. Replace cooking heater. [B] Forced application of current Cause Chopstick, wooden piece, etc. inserted ontocooking button. (continuous application of current) Switch lever deformed or maladjusted, causingcontinuous application of current. RemedyInserted to prevent earlier turning off? Refer to cause in (a) above. Repair or replace parts. When fusion takes place, check the cause, set right the faulty section, and be sure to usereplacement parts. 6 SR-GA421/SR-GA281/SR-GA721 3. TROUBLESHOOTING GUIDE When receiving the cooker to be repaired, be sure to always take charge of not only the cooker body but also the pan and the lid, and ask for details as to the symptom of the trouble. Furthermore, when making troubleshooting of each part, be sure to remove the power plug fromthe socket. Symptom Diagnosis Remedy Cooking function . Cooking fails (Cookinglamp is not shown) No continuity of cord? Yes .Replace AC cord. No continuity of thermal fuse? Yes .Locate cause for fusing andreplace fuse. No continuity of micro switch? Yes .Replace Frame ass’y. Center thermostat is broken? (Checked evaporation test) Yes .Replace center thermostat. Switch lever properly adjust? No .Adjust Switch lever. .Cooking fails (Cookinglamp is not shown) No continuity of sheathed heater? Yes .Replace sheathed heater. .Thermal fuse blown Forced application of current? Yes .Explain correct usage. .Rice burns (Brown color) Center thermostat defective? (Check with evaporation test) Yes .Replace center thermostat. Switch lever has been properly adjusted? No .Adjust Lever. Usage correct? .Rice is not rinced well enough? .Using with low rated voltage? .Too much water input for cooking? Yes .Explain correct usage. No No No No No Yes 7 SR-GA421/SR-GA281/SR-GA721 3. TROUBLESHOOTING GUIDE Symptom Diagnosis Remedy . Earlier Switching-off .Poor cooking finish Too hard Too soft Half-boiled Poor contact between pan and sheathedheater? (Check with bubbling test) Yes .Replace pan or sheathed heater. Center thermostat defective? (Check with evaporation test) Yes .Replace Center thermostat. Switch lever has been properly adjusted? No .Adjust switch lever. Usage correct? .Too small or large in rice quantity. .Too small or large in water quantity. .Switched off once by hand in cooking process. .Switched off by shocks given in cooking process. .Rice not untied. .Explain correct usage. Keep warm function .Warming fails (Warm lamp not shown) Micro switch change contact to NO (Warm mode) after cooking is done? No .Adjust switch lever. .Warming fails (Warm lamp shown) No continuity of warming heater? Yes .Replace warming heater. No No Yes 8 SR-GA421/SR-GA281/SR-GA721 4. TESTING PROCEDURE 1. Bubbling test Input the pan in the main body, and lightly rotate the pan clockwise and counter c...

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