Question about Microwave Ovens
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Posted on Jan 02, 2017
SOURCE: Microwave blows fuse
The most common suspects are the high voltage transformer and the magnetron. It's also possible you have a flaky door switch or loose door switch mount. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383
Posted on Jun 08, 2007
SOURCE: Sharp R-1450 Microwave Oven
The most common suspect here is a shorted high voltage capacitor, since you say it blew the fuse right after Start, but I would certainly suggest checking the door switches and door switch mounts first. Just be sure you installed the right fuse. It would be a The switch mounts seem to break at about this point in the life of these models. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://www3.sears.com (the three is correct)
Posted on Jun 08, 2007
If the fuse or breaker blew again, you probably have a shorted high voltage capacitor. If not, then you may have a shorted high voltage rectifier diode.
Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:
You can usually find helpful exploded view diagrams and order parts by entering your full model number here.
There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Sep 16, 2008
The circuit is probably a 20Amp circuit (see the number stamped on the circuit breaker switch). Most likely, it is the same circuit as the refrigerator, crock pot, window A/C unit, etc....
Also, if you are using an extension cord or a power strip or a surge protector. Those may not have a high enough power rating.
One other possibility (not likely) is that the circuit breaker is a 15Amp and the microwave is 1500 watts.
What else is cut off when the circuit breaker is tripped?
Solution is to use a different outlet for the microwave, or turn off any other applicance in the same circuit (except the refrigerator, of course).
Hope this helps!
Posted on Sep 16, 2009
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