Question about Sharp R-508HS Microwave Oven

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There is sparking from a small metallic plate mounted on the right side of our sharp R-508HS microwave, along with an ugly humming noise. this plate is adjacent to the magnetron grille. i had heated a hotdog bun a moment before putting in a weiner to cook, the sparking started a couple of seconds after i hit the "start" button. is our microwave dead? thanks for any help i can get....i'm on disability and buying a replacement is a relatively expensive option for me....

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Sparking in a M/wave is a problem as it can damage the works. Not sure what the plate is you speak of, Generally all metal objects are painted with enamel to prevent sparks. The humming is a worry though as it indicates something not functioning correctly in the Magnatron which is a large transformer like object. M/waves are not as expensive as they once were and can be picked up second hand under warranty from cash exchange places for about $30 onwards. I recognise that even that is an expense you dont want, but to continue to try and use a sparking MW is dangerous and is often not worth the money you spend on repair, against a used or refurbished one with a warranty.

Sorry I cant come and take a look for you ( I am in Australia) and help you out any further. But my advice is if you cant fix it yourself easily, Ditch it and replace it with a used one.


Posted on Sep 24, 2009

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I have a Sharp Carousel Microwave R-1460A. The disk on the ceiling, opposite the warming plate and about the same size, has severe burn marks (probably from food splatters). Any idea what that part is


see this indication and fix it. God bless you
  1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
  2. Cavity/Rack supportIf sparking or arcing in your microwave is near a rack support, any exposed metallic area can be covered with a microwave cavity support. It is also recommended to replace the rack supports in this situation to ensure the issue is resolved.
  3. Cavity paintIf sparking or arcing in the microwave is visible on the side walls, the paint covering the metallic areas could have worn off or chipped. This can possibly cause pitting in the side walls or ceiling. If this is the case, it can be repaired with microwave cavity pain

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This is not good, the magnetron is arcing because metal is exposed, this will eventually destroy the magnetron making the oven useless. I strongly suggest it get looked at for safety and potential fire hazard.

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I have a Sylvania Microwave oven Model # SM81004/SM81001 1.0 cu.ft. It started sparking during reheating a plate of food only after about 1 Minute. The metal plate on the right side looks like it has a...


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We have a Sharp Carousel Microwave, model #R-508HS. The other day it just stopped working. The time works. We can set the time and it counts down the time, but it doesn't turn or cook at all.


You likely have a bad primary interlock (bottom door switch) or its mount is bad.

See this file on safety and this file on door switch diagnosis and replacement.

If needed, the service manuals are here and here.

If a switch is all you need, we offer a universal type for only $5 postpaid which you can order here.

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

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A dirty or damaged wave guide cover can cause sparks, fire and noises. You can order a replacement wave guide cover from many appliance parts websites for less than $15 in many cases. It should fix the problem.

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When using on small amounts of food would burn (spark & flame)


Sparks in microwaves are caused by metal things in there. What kind of plate - any metal or gold leaf decoration on it?
Try a microwave safe dish.
Make sure you do not use metal items in microwaves.
I do not know the model number of your nuker, is it a new one or old? How long have you had it, and has it always done this?

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Microwave sparking, etc.


Quite often this is due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.

If the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.

If your waveguide cover is burned, it will need to be replaced.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We're happy to help and we appreciate your thoughtful rating of our answer.

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