Question about Jenn-Air JMC7000 Microwave Oven
I HAVE REPLACED THE CERAMIC FUSE 2 TIMES. THE ORIGINAL LASTED 11 YEARS, THE SECOND - 1 YEAR, AND THE THIRD 6 MONTHS.
IS THERE A REASON, OR ANOTHER COMPONENT I SHOULD BE REPLACING?
The fuse holder may be loose.
With the microwave unplugged, if you can easily turn the fuse with your thumb & forefinger while it's in the holder, it has overheated and fatigued and should be replaced.
Simply squeezing its terminals together with pliers is not really a good solution.
When a connection is loose, heat results, which eventually melts the fuse internally.
This is usually evidenced by a very tiny ball of solder at the point where the end cap meets the body of the fuse.
You can use a generic holder - it's a lot cheaper than ordering one. The connectors should be 1/4" tabs and it should be rated at 20 amps or better.
You should be able to get one from a home center or local appliance parts store.
If it's not loose, then it may be a failing magnetron or high voltage transformer pulling too much current.
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Apr 12, 2008
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Posted on Jan 02, 2017
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It sounds like the magnetron may have
either failed or is not being supplied with the extremely high
voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.
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