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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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More Rice Cooker Failures
I've worked my way through four rice cookers, two different brands, in
as many months. The failure mode is consistent - the cooker cooks the rice, and then fails when it goes into the mode where it keeps the rice warm. In each case, it seems that the temperature sensitive fuse has blown. I'm in Australia, where the nominal mains voltage is 240V, but I actually get more like 250V. I'm trying to figure out whether this can really explain these multiple failures. The warming mode involves having an extra component in series with the heating element. I speculate that it is a capacitor, though if it is, its value is less than my multimeter will measure. Anyone have any thoughts on whether these things really run so close the edge in warming mode that a 4% overvoltage can kill them? Sylvia. |
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Check the power label on the cooker to make sure that it is rated for your
mains line voltage and mains frequency. Contact the dealer who sold you the rice cookers and tell them about the problem you are having. -- Personally, I would prefer to use a good old fashioned pot on the stove to cook my rice. It is usually much less of a problem this way... -- JANA _____ "Sylvia Else" wrote in message u... I've worked my way through four rice cookers, two different brands, in as many months. The failure mode is consistent - the cooker cooks the rice, and then fails when it goes into the mode where it keeps the rice warm. In each case, it seems that the temperature sensitive fuse has blown. I'm in Australia, where the nominal mains voltage is 240V, but I actually get more like 250V. I'm trying to figure out whether this can really explain these multiple failures. The warming mode involves having an extra component in series with the heating element. I speculate that it is a capacitor, though if it is, its value is less than my multimeter will measure. Anyone have any thoughts on whether these things really run so close the edge in warming mode that a 4% overvoltage can kill them? Sylvia. |
#3
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Sylvia Else wrote:
: I've worked my way through four rice cookers, two different brands, in : as many months. The failure mode is consistent - the cooker cooks the : rice, and then fails when it goes into the mode where it keeps the rice : warm. : In each case, it seems that the temperature sensitive fuse has blown. : I'm in Australia, where the nominal mains voltage is 240V, but I : actually get more like 250V. I'm trying to figure out whether this can : really explain these multiple failures. The warming mode involves having : an extra component in series with the heating element. I speculate that : it is a capacitor, though if it is, its value is less than my multimeter : will measure. : Anyone have any thoughts on whether these things really run so close the : edge in warming mode that a 4% overvoltage can kill them? : Sylvia. The keep warm rice cookers I've seen use a secondary warming coil separate from the main cooking coil. I would doubt the extra component is a capacitor, maybe thermal fuse. Is there continuity in the heating circuit? Its possible the overvoltage could have blown a thermal fuse, it all depends on how much margin was used when selecting the fuse. |
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