Question about Sharp R-1480 Microwave Oven

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Noisy makes a roaring sound and doesn`t heat. carousal still turns

Posted by a1patioman on

  • a1patioman Jan 05, 2009

    bought new micro. was cheaper than fixing old. thanks



1 Answer

William Miller

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That's probably a shorted high voltage diode or a bad magnetron.

Sometimes a failed magnetron sounds like someone gurgling into an empty coffee cup.

We have the service manual for this model and have uploaded it to our site here to help you.

You will need the free Adobe Reader to view or print it.

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

The best place to order Sharp parts is Tritronics.

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

Posted on Aug 12, 2008


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1 Answer

My Whirlpool microwave over-the-range oven makes a loud roaring sound when it turns on and won't heat.

Sounds like it could be a bad magnetron. The roaring could be a shorted mag or possibly a mag arcing in the wave guide If it is arcing in the wave guide, better to replace the unit.

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Gh5184xps3 microwave

this cause noise ; God bless you

  • MagnetronIf your microwave is emanating high pitched or growling noises during operation, the magnetron could be going bad. Normally a nearly silent part, the magnetron uses high voltage and induces the frequency required to cook food. Although normally not a safety hazard to operate, this is a sign that the magnetron is failing and will need to be replaced as soon as possible.
  • Exhaust fan motorIf your microwave is making a very loud humming noise during operation, it could possibly be the exhaust fan motor. If defective the part will need to be replaced to silence the appliance once more.
  • Stirrer motorAnother leading cause of a noisy microwave is an expired stirrer motor. With use this part becomes worn and makes a loud grinding noise, which is usually a leading indicator that the part needs to be replaced. The stirrer is a metal blade that is slowly turned by the motor. This action disperses the microwave energy in a random pattern, which heats the food evenly. If the stirrer motor is determined to be nearing expiration, it should be replaced to halt the grinding noise.
  • Turntable motorA very common cause for a noisy microwave is a worn out turntable motor. This is a relatively easy repair and will put an end to the noise once replace

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    Jul 18, 2013 | Whirlpool Microwave Ovens

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    Microwave makes a loud roaring sound when start is pressed to cook something. The turntable turns and lights go on, but sound is horendous. We quickly stop it fearing it might be melting down.

    Most likely it is the magnatron has gone bad, this or the fan for the magnatron. If your handy you can dissasemble the unit and look for a damaged fan, if none found then the magnatron is most likely bad.

    May 07, 2011 | Sharp R-308J Microwave Oven

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    Makes a loud roaring sound when it is turned on. Is it safe to use?

    I would say it wasn't and the magnetron or HV Diode requires attention.
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    If the unit is not making a roaring sound, more than likely it could be the High VOLTAGE Magnetron, This is a VERY DANGEROUS Part to Change due to the High Voltage That is Stored inside the HV Capacitors. The Way you check the Magnetron is With an Ohm Meter. Check Each Side To Ground Should read open.

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    Microwave will not heat food and is noisy

    Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

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    There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


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    Ge jvm 1653 won't heat

    You've got a problem in the microwave circuit, which could be one or more of the following components -

    1) HV diode
    2) HV Capacitor
    3) HV transformer
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    I am leaning to the diode, but it would take further investigation to determine for sure. Diodes are cheap, as if the capacitor, and replacing those first would not necessarily be in vain if it turns out to be the transformer or magnetron. And I would be most inclined to say it's the magnetron before I would think transformer.

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    The first thing I would suggest is to turn off the breaker or unplug it from the wall for a few minutes to "reset" it, then try again. If a reset doesn't fix it, I would think you may have a defective magnetron. When you heat something of very low moisture content, it can lead to microwave energy not being fully absorbed, but instead being reflected back to the magnetron. This can damage it. This is usually best left to a pro to repair. In case it might help, your owner's manual can be found online at:

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