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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 HV cap. Working to shorted overnight?
Sharp oven, approx 8 years old. Turned it on tonight, loud hum for 1/2 sec, blue flash from rear, then nothing,. Since my background is electronics, I opened it, found the 20A fuse was open and installed a new 10A one ((biggest 250V fuse I had) Turned on, and observed that the flash came from the capacitor in the rear. (Can't tell excatly where it was arcing..) Checked cap for charge (dead), metered it,. 2 ohms!.. As a final test, I connected it in series with my bench supply and a #1157 automotive bulb, and it lights.. (it really is shorted.) Has anyone seen this failure mode before? In my past experience, caps generally fail slowly. BTW: The HV diode is good, I connected my supply across it with the curent limit set to a few mA, and ti conducts at about 7V. -- Email reply: please remove one letter from each side of "@" Spammers are Scammers. Exterminate them. |
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