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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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Annoying Clock on Microwave
On Friday, April 22, 2011 10:35:47 AM UTC-7, jeff_wisnia wrote:
From my "I can't believe they'd make it this way" list. Last year I purchased a new Westinghouse Model WST-3501 microwave oven for our office lunchroom. The TOD, which is displayed whenever the unit is on standby, loses about two minutes a day, and has to be reset every few days Check your outlet! It sounds like some considerable voltage drop occurs in the wiring and the clock stops during operation. I've seen a microwave gain seconds when in use, too (the TTL chips in the clock circuitry had no bypass capacitors). |
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Annoying Clock on Microwave
whit3rd wrote:
On Friday, April 22, 2011 10:35:47 AM UTC-7, jeff_wisnia wrote: From my "I can't believe they'd make it this way" list. Last year I purchased a new Westinghouse Model WST-3501 microwave oven for our office lunchroom. The TOD, which is displayed whenever the unit is on standby, loses about two minutes a day, and has to be reset every few days Check your outlet! It sounds like some considerable voltage drop occurs in the wiring and the clock stops during operation. I've seen a microwave gain seconds when in use, too (the TTL chips in the clock circuitry had no bypass capacitors). I doubt if it's voltage drop because the clock loses about 6 minutes over a three day (holiday) weekend when no one is there using the microwave. Also, FWIW, a complete power drop out and recovery causes the clock to start at 12:00. -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) The speed of light is 1.8*10e12 furlongs per fortnight. |
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