On Jul 3, 11:20*pm, "Ulysses" wrote:
Hi everyone. *I read many web sites about testing and repairing microwave
ovens and have concluded that my Sharp microwave has a bad diode and
capacitor. *I checked the magnetron and, according to what I read, it's
probably OK as I get a reading of about .4 ohms across the terminals and it
is not shorted to the case. *However, I'm wondering if it is possible to
test the magnetron with low voltage DC. *I assume that what is usually fed
into it is 120 VAC rectified which I think will result in about 170 VDC. *If
that's the case, then could 12 VDC be used just to verify the magnetron
still works before spending money on other parts? *I ain't gonna do nothin'
'les someone says it's OK and explains how ;-) *The sympton right now is
that it buzzes and blows the fuse so I'm thinking an open diode and shorted
capacitor results in feeding 60 Hz AC to the magnetron thus causing the
buzz. *Does that sound right?

Thanks.

Chuck the bloody thing out & buy another. They cost peanuts these
days.
BTW, I have a forty year old Sharp microwave oven. Used every day.
It cost £200 ($300) back then, a fortune :-)
You might get five years out of a new one though.