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.

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The magnetron is supposed to make an arc to work but when it is getting out of hand it will sound wrong. At that point it is time to change the large capacitor and the magnetron. If there is an arcing inside the cabinet then you have to look for missing powder paint. Don't use any metal racks in a microwave or they will arc.

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It is possible, but you heard a similar bang earlier, from the description the magnetron is arcing on a occassion because it is failing, or there is bare metal exposed on the interior. I would recommend getting it checked out to make sure there is no safety hazard and have it resolved.

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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.

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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.

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it sounds like the transformer is bad, which makes this easy, time for a new one. 12yrs is a good age for a microwave, average life is about 8-10 yrs!

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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.

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