Question about Sharp R959SLMA 900 Watts Convection / Microwave Oven

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Arcing and bang noise

I just bought one of these second-hand. It frightened the life out of me & and the wife. What's happening? First time you switch it on & put something in it to cook, press the time required & then start, there is an almighty bang/loud electrical arcing coming from behind the control panel/right side. It then stops and the oven works normally, Do it again and it's OK. Don't think it's the megaton, as it would not heat. Leave it for a few hours and it will do it again, when 1st used. Could it be the capacitor....? Help

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The arching is probably to the cabinet where paint is missing. This usually occurs at the edge where the microwaves travel into the cabinet. You can get microwave paint from your local appliance parts supplier. It's special paint that is non - conductive.

Posted on May 18, 2014

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Posted on Jan 02, 2017

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SOURCE: microwave ovens

The cover is probably the magenetron. That is where the microwaves come from. If the bread was moist, it might have left condensate in the unit which is causing the sparking. Unplug the unit, leave the door open over night. If you can remove that cover, do so. Be sure to carefully replace it before using the unit. Never turn on a microwave with nothing in it.

Posted on Dec 17, 2007

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Sharp R959SLMA


Could be arcing around HV transformer or even an HV wire, Sometimes an insulator on a capacitor will get old, dusty or breakdown and arc between the terminals. Have you ran this with the cover off to see if you can see any visual arcing??? If it cooks sure sounds like it is probably not the mag. Something supplying power to the mag arcing to ground I would expect.

Aug 18, 2017 | Sharp R959SLMA 900 Watts Convection /...

1 Answer

Microwave make loud buzz sound occasionaly, mainly if I try to do popcorn but it does it with other food too


Check your waveguide cover / spatter shield for grease or food particles. It may be arcing.

To help you further (with free advice), I would need to full model number and FCC ID number from the label on / in your microwave.

Contact me directly here.*

* FixYa doesn't always notify us Experts when you follow up online

Jan 28, 2018 | Microwave Ovens

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What causes a ge spacemaker above the range microwave to quit heating and makes a deeper pitched noise?


This louder, 60 cycle hum is usually caused by a bad magnetron. The unit will not heat when this happens. Repair cost can exceed $100.

Dec 29, 2017 | GE Spacemaker JVM1540 Microwave Oven

1 Answer

Model nn-n765 Was running made a scrapping noise then shut down now completely dead won't start no lights nothing


A wild guess: the scraping noise was a motor bearing seizing up (fan or turntable). A thermal cutout blew when something overheated. This would have taken several minutes to happen.

Alternate, and more likely explanation: the scraping noise was actually high-voltage arcing in a failed component, most probably the voltage doubler capacitor. This would blow the fuse. Replace both the capacitor and diode; the diode was probably overloaded and could fail at any time if it hasn't already. At $5-$10, it's cheap insurance against having to fix the thing twice.

Jan 18, 2011 | Panasonic NN-H765 Microwave Oven

1 Answer

After about 2 weeks of use, the microwave began to make a horrible buzzing noise from the "box" in the upper right hand corner on the back. It also smelled horrible. It then proceeded to stop working...


Two weeks? This is a warranty problem. The buzzing noise was probably either from high-voltage arcing or an overloaded transformer trying to drive a shorted component. The smell is from something electrical getting fried. Remember it; the next time you smell it, you'll know to pull the plug.

Oct 12, 2010 | Sunbeam SMW777 Microwave Oven

1 Answer

Arcing and noise when turn it on


I cleaned the microwave really well. I used a screwdriver to pull the plastic cover out enough to clean behind the edges with a soft toothbrush. Seems to have corrected the problem.

Oct 15, 2009 | Whirlpool MT4155SP Microwave Oven

1 Answer

MICROWAVE WILL NOT HEAT FOOD AND TIMES OUT @ 30SEC'S


Replace the magnetron and the wave guide.

May 14, 2009 | Microwave Ovens

2 Answers

Electrical issues inherent in this model?


its the problem of voltage the electriccurrent.call a electrician and get the electricity power checked of your place.the oven is getting required current so this problem is coming.

Oct 18, 2008 | Panasonic NN-P794SF Microwave Oven

1 Answer

3 microwave ovens in 18 months - all won't heat up - what is causing the recurring problem?


Carla, Sorry to read of your troubles. Your unit that is only 2monts old should be under warranty, or did you receive any warranty?
What you describe as " the noise one gets when metal is put in by mistake". The noise is Arcing of Microwave Energy. Do not operate a Microwave Oven DRY (without something inside that will absorb the Microwave Energy. A Dry-Run Microwave Oven will feed-back upon itself and do damage.

If your unit is matched to the electric needs, both voltage and cycles, then I would not get another one of the same Model.

Feb 02, 2008 | Microwave Ovens

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