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From: Cydrome Leader on 20 Jul 2010 11:58
Mr. Land <graftonfot(a)yahoo.com> wrote:
> I have new info.
>
> Firstly, though THANK YOU ALL for taking the time to try to help. I
> appreciate it.
>
> So....I have replaced the magnetron in this before. AND, I read that
> there seems to be a rash of
> problems with these magnetrons.
>
> But, the new info: my wife told me she'd heard the uWave emit this
> "loud arcing noise" just before it
> stopped heating food.
>
> I couldn't find any evidence of arcing within the HV section itself,
> however, when I removed the magnetron and
> inspected the "antenna" (?) it looked as though it had been arcing:
> there is a brass-colored conical tip that's flattened at the top
> with a hole in it. That extends down towards the body about 1/2", then
> there is a violet-colored band of some
> material I can't identify...it appears to be some sort of insulating
> material. Then under that is the RF braided gasket.
>
> Well, where the purple insulating bushing and the copper tip
> meet..there is a slight blackening and pitting...as
> though arcing had occurred part of the way around that seam.
>
> Does it make sense that the magnetron would arc there?

yeah, that's pretty common. I don't recall why it happens though. The
microwave here at work died that way, I still have the magnetron laying
around.

It's possible it could have been cleaned up and used again, but a new $100
microwave oven showed up instead.
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