Question about Sharp Microwave Ovens

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Our Sharp Microwave makes a strange noise like it wont power up. It's a louder than normal buzz and nothing cooks. It sounds like it does if you put it on "defrost" but the "buzz" is a little more pronounced.

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You have a bad fan inside the microwave also you need to replace 10amp fuse in order to power on.

Posted on Jul 26, 2009

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1 Answer

Microwave wont heat


We would need to know the full model number from the tag in the cooking cavity or elsewhere on the microwave, such as the door frame, controller frame, etc.

Please post a new help request with that and more detailed symptoms, such as when it occurs.

When you hit "Start" to microwave, do the inside light, cooling fan, and turntable all come on?

Any unusual noises? Is it louder or quieter than usual?

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

Apr 15, 2013 | Sharp Carousel 1.5 cu. ft. Countertop...

1 Answer

Makes a really loud buzzing noise during operation


Unit uses a Magnetron and likely a power board called an inverter to run it. Someone would have to open the unit in a way where they might pinpoint where the sound is coming from and then take action--does not of course sound normal or good to me.

Dec 10, 2012 | Samsung SMH1622W

1 Answer

Sharp R-1510 1000 watts microwave, not heating


Sounds like the inverter (power supply for cooking) or the magnatron which does the work----neither are cheap parts.

Oct 16, 2012 | Sharp R-1510 Microwave Oven

1 Answer

LOUD BUZZING NOISE AND THE ANSWER I RECEIVED WAS FOR A DIFFERENT MODEL. CAN I FIX IT MYSELF?


If the loud buzzing noise is present when cooking food, the magnetron is the likely cause, some models are louder than others. But if the buzzing noise is there without the microwave running it should be checked. No! this something that should be checked by a professional for safety.

Mar 17, 2012 | GE Monogram ZEM200SF Microwave Oven

1 Answer

Sharp R-7A82, buzzing/no heat


buzzinsg / humming / loud or louder than normal .is probably the mag / it has failed and the trans is making that noise . if older than 5 yrs I would replace ans the mag is 100.00 + and w / labor you have paid for a new on but have the old one .**** ..

Dec 23, 2009 | Sharp R-630D Microwave Oven

1 Answer

Microwave turns on but it makes strange noises and does not cook anything. After a little while I get an error message that says something like cooking sensor has timed out


So we can help you, please post a NEW question, and please include your full model number from the tag in or on the unit, as well as the answers to these questions:

When you try to microwave are the inside light, internal cooling fan and turntable all working?

Is there any unusual noise or is it louder or quieter than normal?

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, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

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

Oct 11, 2009 | GE Microwave Ovens

1 Answer

Blown Microwave


Most likely a shorted capacitor and a blown fuse. Very common problem on that model.

Jul 16, 2008 | Microwave Ovens

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