Question about GE Spacemaker JVM1640SJ Microwave Oven

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Spacemaker II makes horrible loud vibration noise

What do you think is wrong?

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If the vibration is there with the magnetron off, using only the timer section with power set to 0%, then the cooling fan likely has a bad (sleeve) bearing and needs to be replaced.
If the vibration occurs only when the maggie is running (heating water for example) then the noise is probably from loose laminations in the power transformer due to sloppy manufacturing. You can quiet the beast if you remove the back panel and pour about a teaspoon of epoxy glue across the laminations of the transformer. Normally, when transformers are made, the final step is to dip the whole thing into a type of lacquer that seeps into the laminations and keeps them from resonating at line or some related frequency.
I would expect the problem to be caused by the fan(s), especially if this is a unit that also has range hood function too.
If you are in the US, check Johnstone Supply for a store in your area. They are wholesalers to the service trade but I have never been turned down when buying appliance parts there and the savings can be as high as 60%.          

Posted on Nov 18, 2008

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