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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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Kenmore microwave
I have a Kenmore microwave (Model 99921 or 564.9998210) that has served me
faithfully other than replacing the magnetron about 15 years ago, and now has two irritations. The first is the beeper - it doesn't beep very well. Actually, I prefer it that way, but the family complains. The particular piezo on that circuit board (Sanyo 11355, EM3826 P/C-1) has 3 leads on it and has 1E4 printed on it. What's happened is that one of the particular traces, if you can call them that, that has a lead soldered to it has lifted and come loose from the disc. I tried resoldering the lead farther down the trace, but all I get for sound is some very faint buzzing or a very low volume chirp. This leads me to conclude that the mechanical failure is the problem, rather than a driver or such. I have played with some 2-lead devices to no avail. Anyone know of a source for the proper part? I tried Sears and they only sell the complete board for something like $195 - NOT. I'll do without before that. The other issue is with the fan. It sounds like it isn't always coming up to speed, or at least not right away. I have thoroughly disassembled, cleaned, and lubricated it more than once. When it's running and then you shut off the power, it takes a while for it to stop spinning, all of which leads me to rule out lube or bearings. I measured the voltage across it and it's full line voltage, and measuring the coil resistance reads what the wiring diagram says it should be. I've decided to let it run and see what happens, but I'm a little concerned about not cooling the magnetron well enough to protect it. Any thoughts? WT |
#2
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Kenmore microwave
I've looked high and low around here - any suggestions which rock to turn
over? WT "Gary Tait" wrote in message ... On Mon, 15 Sep 2003 12:36:48 -0500, "Wayne Tiffany" wrote: I have a Kenmore microwave (Model 99921 or 564.9998210) that has served me faithfully other than replacing the magnetron about 15 years ago, and now has two irritations. The first is the beeper - it doesn't beep very well. Actually, I prefer it that way, but the family complains. The particular piezo on that circuit board (Sanyo 11355, EM3826 P/C-1) has 3 leads on it and has 1E4 printed on it. What's happened is that one of the particular traces, if you can call them that, that has a lead soldered to it has lifted and come loose from the disc. I tried resoldering the lead farther down the trace, but all I get for sound is some very faint buzzing or a very low volume chirp. This leads me to conclude that the mechanical failure is the problem, rather than a driver or such. I have played with some 2-lead devices to no avail. Anyone know of a source for the proper part? I tried Sears and they only sell the complete board for something like $195 - NOT. I'll do without before that. The other issue is with the fan. It sounds like it isn't always coming up to speed, or at least not right away. I have thoroughly disassembled, cleaned, and lubricated it more than once. When it's running and then you shut off the power, it takes a while for it to stop spinning, all of which leads me to rule out lube or bearings. I measured the voltage across it and it's full line voltage, and measuring the coil resistance reads what the wiring diagram says it should be. I've decided to let it run and see what happens, but I'm a little concerned about not cooling the magnetron well enough to protect it. Any thoughts? WT Go and find a generic 3-wire piezo element. |
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