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Microwave Arcing inside

I have a sharp carousel R-4W38 microwave, about 8 yrs old that just started arcing inside when used. The arcing has burned thru the cover plate. I am sure it's the microwave generator "Magnatron???" but cannot find the part number or what that part will cost.
I repair comupters all day so I am confident I can disassemble this thing and replace the part if I can find it....

My questions are:
1. Can someone help me witht he part number and cost?
2. Is there any adjustment that needs to be made after the part is replaced that I cannot do because I don't have meters?
3. Any other gotcha's that I might not be thinking about here?

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Found the online service manual and did the troubleshooting necessary to determine it was the magnatron. I have one ordered.

Posted on Nov 05, 2008

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  1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
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Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

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heatman101

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