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I have a “Jenn-Air” Microwave (Model JMC9158BAW15), which sends out sparks during operation. These sparks have perforated a hole in the Cover-Ceiling (AP4221322) and have discolored the inside surface of the oven area just above the Cover-Ceiling. The tip of the Magnetron is charred and pitted. Can I replace this Magnetron and Cover-Ceiling? Will this repair the issue? See this for a video example... Microwave Magnetron Fail - YouTube
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Originally Posted by: mjgeorge  ...Can I replace this Magnetron and Cover-Ceiling? Will this repair the issue?... It will fix it only if the body of the microwave (the tunnel) is not damaged. Otherwise it's time for a new microwave. Gene.
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Hi Gene, thanks for your reply.
I would like to get a better understanding of this; “body of the microwave (the tunnel) is not damaged.”
The waveguide tunnel is smooth but has some spotty discoloring. I have wiped this clean with alcohol. Just over the ceiling plate, on the oven surface, there is also some dark spotty discoloring. I have used soft scrub and alcohol to clean this off. This surface is now clean and smooth, but discolored.
The mica ceiling plate itself has a hole in it. I am replacing this. I figured I would switch our the Diode and Lamp while I’m at it. The Cap is good.
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Remove the magnetron and check the other end of this tunnel. If paint is damaged then it is not repairable.
Gene.
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Thanks Gene,
The waveguide tunnel the Mag connects to is metal, but I do not se that this is painted. Are you syaing there is a coating on the inside surface of this tunnel? The Microwave oven chaimber itself has an enamel paint on this, althogh discolored, it still seems intact.
I think I'm going to go through with this repair and try it out. I'll post the results. If it sparks, I'll get a new oven.
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