Question about Microwave Ovens

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We have a JE1860CB001 built-in microwave that has on several occasions sparked very brightly from the square plate on the inside right of the cavity covering the opening to the microwave tube. It has burned a small hole in the top of the plate and charred the paint at the same location on the microwave. What do I need to do to repair this?

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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.

The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.

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. It provides important protection for the magnetron.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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

Posted on Oct 07, 2008

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1 Answer

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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When I turn it on it starts to spark as if I put a metal or alluminium foil inside the microwave oven.


Any carbonization on the turntable will attempt to spark like that.
Clean the cavity completely and the turntable with glass plate. There is a wave guide cover that sparks when it is contaminated. That will require changing if it is the culprit.
Contact your supplier for spares.

Jan 20, 2011 | Emerson 025806092806 Microwave Oven

1 Answer

The enamel is wearing off where the back side meets the base on the inside of the oven. No sparks are flying but is this repairable? Emerson MW8775W Microwave Oven


Small areas inside the cavity can be repaired. The bare spot must be very smooth. You can sand it down if needed and then repaint. There is a m/w cavity paint sold in a spray can, but I've had really good luck using regular appliance touchup paint. Just be sure the spot is very smooth when you finish. Use several thin layers of paint instead of one thick layer and you should be ok.

Dec 28, 2010 | Emerson MW8775W Microwave Oven

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Put a hamburger in to heat, on a paper plate. The interior began to spark. the plate on the Right hand side appears to have a something black and charred (as if a piece of meat or grease has adhered to it)...


Usually the sparks are from exposed metal. Clean the oven, and the table and anything else you can inside. Then just try nuking a cup of water. That gives it something to work with and it won;t make any sparks itself. Then just see if the sparks are gone. If the paint has come off inside the cavity and exposed some metal you can get sparks but that usually means replacing the microwave. If its caused by an object or buildup then a good cleaning stops it.

Oct 10, 2010 | Whirlpool MT1110SKQ 1100 Watts Microwave...

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Fire inside oven during operation on right side metal plate


Arcing is caused by the build up of grease that is converted to carbon. Clean the baked on carbon from the oven cavity. If regular cleaning doesn't remove the carbon, sand it away and touch up with a similiar color paint.

Jun 21, 2010 | Thermador MBBS Microwave Oven

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The silver fiberglass plate on the right side of the inside of my microwave has gotten a hole in it, causing the microwave to spark. Is it possible to replace this part? I have had the microwave less than...


yes you can buy a sheet and cut it to size-just ensure that any bare metal inside the microwave caused by the sparking isrubbed down and painted with two coats of ,hammerite metal paint otherwise its back to square one

Feb 25, 2010 | Emerson MW8107WA Microwave Oven

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Fiber plate inside microwave burned out- Sugges Alternative


I had the same problem several years ago. I took it out and just left a hole. No problems yet.

Sep 07, 2009 | Goldstar MV-1526 Microwave Oven

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My high power GE Advantium microwave is sparking


Your problem is a common one. When you see arcing inside your microwave, it's because of food or liquid left in the cavity or on the wave-guide cover:

  • If the wave guide has any burn spots, replace it and clean the unit well.

  • If the cavity has any burn spots, spot-sand it smooth and touch it up with microwave interior paint.
Note… If there are any burn holes in the cavity, don't use the unit-seek help from a qualified appliance repair technician.

May 28, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Microwave sparks


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.

The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.

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. It provides important protection for the magnetron.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

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

Sep 22, 2008 | Frigidaire FMV156DC Microwave Oven

1 Answer

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.

May 21, 2008 | Sharp R-520LK Microwave Oven

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