Question about Sharp Microwave Ovens

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How do I install a waveguide in a Sharp microwave oven? The old one burned through because of corrosion beneath it. I sanded it & repainted with rust preventative paint. I don't want to break it during installation. I believe the old one had a strip of double faced tape across the top edge. Any suggestions for an adhesive? Thanks.

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  • Sharp Master
  • 9,047 Answers

If you mean the waveguide cover, those are almost always mica or plastic.

They would normally install by sliding them into slots in the cavity or ceiling, and sometimes they are held in pl;ace with a plastic rivet, too.

If a waveguide cover is damaged, it should be replaced with a new one, not repaired in any way.

Arcing will occur, which can damage your magnetron, waveguide, and / or chassis.

If you mean the waveguide itself, which channels the microwave energy from the magnetron to the cooking cavity, that cannot be removed or replaced. They are welded in place. If the waveguide is bad, the oven has to be replaced.

We have quite a few Sharp service manuals which cover disassembly and parts lists, etc. If we have it, I can point you to a link to download it free.

Feel free to contact me directly with your model number.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on May 30, 2010

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1 Answer

Oven began to spark and smell. The waveguide cover broke apart & scorched side now won't heat. Clock/light work so does the turntable but groans. Is it fixable or done?


It is possible the magnetron may have been destroyed. Arcing in the waveguide would likely cause a significant increase of cathode to plate current through it; possibly melting it internally. You could also have failure of the high voltage rectifier; caused also by high current. If that's the only problem, then it's possibly repairable for a reasonable cost. You would have to repair and repainted the waveguide. Some waveguides have a vertical bar in them to aid in dispersion of the microwaves. If this is loose and shorting, then you'd have to replace the entire frame/cavity. Not very practical.

Mar 29, 2016 | Sharp R-1214 Microwave Oven

1 Answer

Is it dangerous to use the microwave without a duct cover


Yes, the waveguide (duct) cover protects the waveguide and the magnetron from damage caused by grease and food particles getting on them.

The waveguide cover (also called a spatter shield) 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 area is charred or chipped, the area will first have to be sanded smooth and cleaned and dried thoroughly.

If the cavity metal of the oven is cracked or split, you can use a small amount of steel-based epoxy such as JB-WELD to patch the crack or hole.


Once that dries thoroughly, you can sand it very smooth.

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 critical protection for the magnetron.

You can order a new waveguide cover form
Encompass here.

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

Jun 06, 2011 | Sharp R-216 800 Watts Microwave Oven

1 Answer

My viking professional microwave is shooting sparks and caused a burn mark on the inside of the oven wall? Can I fix it or is it shot?


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

The waveguide cover (also called a spatter shield) 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 metal of the oven wall is burned or chipped, the area will first have to be sanded smooth and cleaned 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 the cavity metal of the oven is cracked or split, you can use a small amount of steel-based epoxy such as JB-WELD to patch the crack or hole.

Once that dries thoroughly, you can sand it very smooth, then apply paint.

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

It provides critical protection for the magnetron.

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

May 27, 2010 | Viking VMOC205SS Microwave Oven

1 Answer

Microwave about 3 years old. Started making a bag of popcorn and after about 1 min. the unit started making a sizzling and grinding sound and a puff of smoke was noticed at the inside right panel opening....


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

The waveguide cover (also called a spatter shield) 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 metal of the oven wall is burned or chipped, the area will first have to be sanded smooth and cleaned 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 the cavity metal of the oven is cracked or split, you can use a small amount of steel-based epoxy such as JB-WELD to patch the crack or hole.

Once that dries thoroughly, you can sand it very smooth, then apply paint.

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

It provides critical protection for the magnetron.

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

May 27, 2010 | GE JES1384SF Microwave Oven

1 Answer

Sharp R1211F microwave After shutting door and pressing start, loud buzzing and flash in oven


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.

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

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

You can order parts for this brand from Encompass here or you can call them toll-free at 866-779-5835.

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

Oct 09, 2009 | Sharp Microwave Ovens

1 Answer

Sharp R-520LK is arcing. Should I just replace the waveguide cover?? I tried cleaning it, but it was like paper and now there's a small hole in it.


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

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

If the metal is chipped or charred, the area will first have to be sanded smooth and cleaned 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 or damaged, it will need to be replaced. It provides important protection for the magnetron.

You can order Sharp parts from Encompass here or you can call them toll-free at 866-779-5835.

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

Jul 19, 2009 | Sharp R-520LK Microwave Oven

1 Answer

Not just once, twice!


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

The waveguide cover (also called a spatter shield) is usually about the size of a playing card and often held in place by a plastic rivet.

In some models it is a larger stirrer cover type made of thicker plastic in the ceiling of the oven.

Your manual should address the issue of removing and cleaning the waveguide cover.

If for some reason you don't have your owner's manual, you can download GE owner's manuals and installation instructions here.

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.

Jun 23, 2009 | GE JVM1190SY/WY/AY/BY Microwave Oven

1 Answer

Microwave Magnetron tube has arced


REPLCE THE MAG TUBE AND ***

Feb 08, 2009 | LG Microwave Ovens

1 Answer

My sharp r-510hw flashing like crazy


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.

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 order Sharp parts from Tritronics at http://www.wehaveparts.com

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

Mar 22, 2008 | Sharp R-510HW Microwave Oven

1 Answer

Dacor Microwave


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.

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.

The part would be much cheaper if you get the Sharp version (these ovens are made by Sharp) instead of the Dacor branded part.

The model DMT2420 is essentially the same as model R440D / R540D.

The Sharp part number is PCOVPB085MRP0 (zero on the end) and you can order Sharp parts from Tritronics at http://www.wehaveparts.com

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

Mar 17, 2008 | Dacor DMT2420 1200 Watts Microwave Oven

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