Question about Sharp R-1480 Microwave Oven

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HAVE A SHARP MICROWAVE MODEL R-1480 SERIAL NUMBER 200211. EVERYTING WORKS EXCEPT NO HEAT. IT MAKES A HUM NOISE LOUDER THAN THE USUAL NOISE. YEATERDAY WE DID OVERCOOK SOME HAM. BUT IT WORKED FINE LAST NIGHT. TODAY HUM SOUND; NO HEAT - ONLY EVERYTHING ELSE WORKD FINE. AFTER SOME INFO FOUND OUT IT COULD BE THE MAGNITRON OR POWER DIODE OR HV CAPACITOR AND OR FLAME OVEN SENSOR THERMOMITER. MY QUESTION IS - IS IT WORTH FIXING OR SHOULD I BUY ANOTHER? THANKS FOR YOUR HELP

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We have the same exact microwave & this happened with ours just last night. I'm wondering the same if it is worth having it fixed.

Posted on Sep 05, 2010

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A loud sort of "groaning" noise and no heat is the sign of a bad magnetron tube. The magnetron is the microwave source, and when they go bad it's usually time to replace the oven. Most microwave repairs, especially a magnetron replacement, should be left to professionals. There are lethal voltages under the cover, and the chance of microwave leakage if the repair isn't done properly. With the price of a replacement tube and labor for the repair, it's often doesn't cost much more (and sometimes even less!) to buy a new oven.

Sorry I can't give you a more positive answer, but thanks for using Fixya!

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A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron.

Since it's less than a year old, it's fully under warranty and Sharp will fix it free.

You can contact Sharp at 1-800-BE-SHARP (1-800-237-4277) or visit them online to get it fixed.

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

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Dead replaced fuse now makes loud noise


Yes that noise is causing your fuse to blow. Machine gun sound sounds like the High Voltage Capacitor or High voltage diode is bad. (Loud humming sound is usually a bad magnetron or bad power transformer). Most of these parts are inexpensive, except for the magnetron. But most of the repair bill is most likely going to be for labor.

Based on your model, it looks like an over the range microwave. And to fix any of these problems require the removal of the microwave from the wall. So its up to you if you want to deal with that hassle. But you also have to consider that you'll probably have a hard time trying to find a new microwave that will fit.

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This is tough to call remotely, but it will almost certainly be the magnetron or high voltage capacitor or (if you're lucky) the high voltage rectifier diode.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

Here are some links you or a friend can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

You can order Sharp parts from Tritronics at http://www.wehaveparts.com

If yours is not a Sharp, you can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We're happy to help and we appreciate your thoughtful rating of our answer.

Feb 29, 2008 | Sharp R-1480 Microwave Oven

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