Question about Sharp R-1870 Convection/Microwave Oven

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When I turn on my Sharp R-1870 it starts making a grinding/vibrating noise. A repair person over the phone said probably the magnetron and probably better to replace the microwave. Does a grinding noise usually indicate magnetron problem and what is an estimated cost to repair? He said something like $300 to $350, is that in the ballpark?

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Could also be turntable motor $85.....+........

Posted on May 03, 2010

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Sharp microwave r1870 only runs for 59 seconds


If it consistently runs for exactly 59 seconds, and shuts off, it's probably the control panel.

If it runs approximately that length of time, you might have a defective thermal protector on the magnetron, or the magnetron is running too warm for some reason.

Mar 24, 2016 | Sharp R-1870 Convection/Microwave Oven

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I have a Samsung SMH9187 about three-four years old I think. It does not heat -- everything else works. When turned on it at first makes a grinding type noise and sparks can be seen inside where the motor...


The magnetron won't make a grinding noise so that makes it sound like the fan motor bearings are bad. However if it doesn't heat, that sounds like the magnetron.

Jun 12, 2014 | Microwave Ovens

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Sharp sound bar buzzing


test this steps and fix it. God bless you

  1. 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.
  2. 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.
  3. 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.
  4. 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 replaced.

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#13#ixzz2hVe8AHvJ
http://www.appliancepartspros.com

Oct 12, 2013 | Microwave Ovens

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Sharp R-1870F Microwave Won't turn on


Could be just a fuse but probably the diode pack or magnetron.

May 24, 2017 | Sharp R-1870 Convection/Microwave Oven

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The overhead range Sharp microwave does turn on, however makes a loud humming noise and does Not warm anything/operate correctly.


You have a bad magnetron and diode and will need an appliance repair person to make the repair.

Jun 28, 2011 | Sharp Microwave Ovens

1 Answer

Sharp R-1870 Convection works, microwave doesnt heat


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

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Oct 07, 2009 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Loud buzzing noise when operating


This is most likely a shorted high voltage rectifier diode, but the magnetron may be bad as well.

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

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)


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

Info on ordering Sharp UK parts / spares is here.

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

Jul 10, 2009 | Sharp Microwave Ovens

1 Answer

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.

Mar 25, 2008 | Sharp R-1480 Microwave Oven

1 Answer

Loud noise


If you mean a loud buzz that cuts on and off as the oven works, it is probably the outer metal cover vibrating as the magnetron powers up and down. Try holding/ pushing/ poking the metal cover while the oven is working, if the noise abates or goes away, this is the problem.
You may get relief by simply tightening the screws securing the cover, if not, maybe a little careful insertion of a thin strip of cardboard or similar, at the point the vibration occurs, may dampen it. Good luck.

Jan 18, 2008 | Sharp R-254 Microwave Oven

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