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.

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