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Re: blows main fuse 20A,250V when press start microwave.
First things first, check the big cigarette can type capacitor. OHm it out should not be shorted, meaning reads zero ohms. use ohm meter, set to ohms, put leads across 2 terminals (after your short them with a screwdriver)should not read zero..
next replace magnetron, it's easy, call appliance repair for price if it makes sense and your a gambler replace it.
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The magnetron is shorted, the keypad control board is bad, blowing fuses. If less than 7 years old it has a inverter board that can be trouble, But with the level of work and parts it will easily exceed the cost of a new microwave oven.
If the 20A fuse is blowing, it is often the high voltage transformer or magnetron. If this is the case, and the microwave is not under warranty, replace it. Residential microwaves are generally considered disposable. Parts and labor are just too expensive. A magntron or transformer can cost more that half the cost of a new microwave.
Could be a short in the HV system for the magnetron--usually the HV diode. Another possibility is the metal stirrer fan in the waveguide above the oven cavity may have a shorted bearing (plastic). The short occurs internally within the bearing.
Replace the fuse with a ceramic fuse from Home depot! costs less than $3 and it will fix the problem. I had all the same problems as everyone else, you name it my microwave had it! you must remember replace it with a ceramic fuse! not a glass one. I know people say its the switchboard and all that nonsence but I promise you, the fuse plays a majoe roll in the microwave not working properly. Even though it doesnt look broken, a junky fuse can cause your appliance to do very strange things. I replaced mine 6 months ago and it works like its fresh out of the box.
Here is a link you or someone you know can use to test it, but please read the safety info: http://www.gallawa.com/microtech/cap_test.html For more help from Emerson visit here or get help using your appliance at 1-800-898-9020. Get help locating a servicer or parts at 1-800-695-0098.
Emerson parts are distributed by Fox International and their number is 800-321-6993. Or you might try e-mailing firstname.lastname@example.org
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