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GE JVM1870SK03 won't heat food, hums and puts out a burning smell

I have a GE JVM1870SK03 Under cabinet microwave. Everything seems like it is working (lights, panel, turntable), but does not heat. It makes a humming noise and it puts out a burned smell (no visible smoke) but it doesn't blow the fuse. I have never repaired anything electronic...is this something that a novice could fix, is it very expensive to get repaired - basically, should I repair the unit or replace it...not sure what to do.

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With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron.

The diode is a fairly cheap fix, and the mag will cost more and is more complicated to replace.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)

http://www.gallawa.com/microtech/mag_test.html (continuity can be good even though it is bad!)

There should also be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If it needs a new magnetron, you'll have to remove it from the wall, then remove the outer cover. If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.

If you want to contact GE about having an authorized servicer look at it, or have them send you a magnetron, GE Customer Service is here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Dec 07, 2008

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