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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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Microwave Oven - Interesting
So my sister's uWave stopped cooking. Display normal hums and all that. I have never been a microwave tech., actually never had one break. They usually catch on fire after a while.
But anyway I am hep to it, the capacitor goes bad alot, sometimes the magnetron. Sometimes triac, relay or something on the board comes loose off the solder. Normal ****. So, I break out the old B&K 177 which has a 4 KV AC scale. The cap is rated 2,100 VAC. I read the side with the rectifier and it is around a thousand volts. In fact less I think. I am thinking that is low. Put pur the probe on the transformer side and got an arc ! WTF ? And nothing happened. I chesked the meter, turned it to low AC and putting my finger on the probe made it read. Switched to ohms and that read as well. So I do it again and I DID get a different result. I went to the magnetron side of the caps and got about the same reading, and then when I went to the transformer side my computer started making all kinds of noise. I do not mean 60 Hz noise, this was like a digital stream noise, probably square waves at more than one frequency. Y'know the other day at work I got this unit the owner described as having multiple erratic and spontaneous operations. I decided to be a smartass and wrote it up as : Complaint : Customer says multiple erratic/spontaneous operations. Diagnosis : Unit needs exorcism. Solution : Due to lack of holy water and Catholic Priest, changed main board. I **** you not. But I could not blow it off because we are factory service. Anyway, back to this uWave. On my tester, which tests at 400 mV/360 ohms impedance, the cap checks pretty good. Little bit of curve at the tips of the triangle wave but for a 0.98 uF that is to be expected with these test parameters. So is this indicating I got a leaky magnetron ? If I can get a cap foro ten bucks I will fix it, but magnetrons are more expensive and this thing is well, it is a nice, decent performing uWave oven. Not the best but I have seen alot worse. The heat is even and the control system is not hard to deal with. It is a Magic Chef, input power is stated as 1,500 watts, so it is what, 1,300 ? Nice, small height wise but a bit wider than the really small ones. I just think when you got something good you should try to keep it going. There is no money involved in this one. |
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Microwave Oven - Interesting
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Microwave Oven - Interesting
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