Question about Sharp R-520LK Microwave Oven

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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.

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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.

Posted on Jul 19, 2009

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2 Answers

Sparks inside a wolf mw24 inside in right wall cover plate


The right side wall cover plate is the "waveguide cover."

It protects the waveguide and the magnetron at the other end from moisture, grease, and food particles.

If these remain stuck to the waveguide cover, arcing can occur, which will damage and / or destroy the cover, the waveguide or even the magnetron or the oven chassis.

As with most problems, this should be addressed sooner rather than later or it will only get worse, and may become unrepairable.

The similar Sharp model R-530E-series service manuals are here and here. They will help with disassembly, but the external / cosmetic parts will not interchange.

The Wolf waveguide number is 801798 and Wolf part ordering information is here.

The oven cavity and waveguide must be clean and if any spot is scorched or chipped, it must be sanded smooth, cleaned and dried, then touched up with appliance paint, available from local big box stores, home centers, appliance parts stores, and hardware stores.

Leave the door open overnight to dry the paint. Then install the new waveguide cover.

If the chassis or waveguide have holes in them, the oven must be scrapped and replaced.

For more free DIY and other help & advice, feel free to contact me via my site.

Please include FULL model number*, FCC ID number*, + detailed symptom information. ( * on the tag in cooking cavity or around door frame or control frame or on back)

William E. Miller, AS-EET
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

Dec 05, 2016 | In Microwave Ovens

1 Answer

Why does my microwave arch at the wave guard


Typically most arcing in a microwave is caused by food splatter. A microwave cannot tell the difference between what is on a plate or on the wall or ceiling. Every food particle in a microwave will continue to cook until it turns to carbon and will attract the microwave energy and focus it to that spot and the unit will arc. Thorough cleaning of the entire microwave cooking cavity and removal of any burn or soot mark will commonly stop the arcing. If your microwave has a painted cavity, you can even use some very fine sand paper to remove any burn mark. Always cover what you are warming and really keep the inside of the microwave clean. If your wave guide cover is made out of the Mica board, and If it has gotten wet from cleaning or from splatter, it must be replaced. You can either order a new one or order a sheet of the mica board and cut out a new one yourself. If the microwave is arcing in the waveguide, generally the unit will need to be replaced. One quick test to see if the unit will work is to remove the bad cover and place a small container of water in the unit, run the machine of a minute or so and see if it still arcs. If it does, the arcing is in the waveguide area, if not it may have just been a problem with the cover. You can run the unit without the waveguide cover in place, it is only there to prevent splatter from getting into the waveguide, so removing it to test the unit is ok. If the area inside the wave guide shows signs of soot and arcing. You can try to wipe that out with some alcohol or lacquer thinner and then try it again. Good Luck.

May 15, 2014 | Magic Chef 1.6 Cu Ft Countertop Microwave...

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

Nov 08, 2013 | Sharp R-1460 Microwave Oven

1 Answer

My microwave arcs every time I try to heat something. The silver colored plate on the interior right side of the cabinet appears to be burned. What happened and can it be fixed?


This arcing is caused by food splatter when something 'popped' or 'exploded' during an earlier cooking cycle. The food particle remained and every time the microwave gets used, this particle continues to cook until it turns into carbon. This can be as small as the tip of a pin. Carbon reacts very violently to RF energy (which is what causes the food to heat). You need to carefully remove the "waveguide cover". Clean it and check for a burned spot. You also need to inspect the inside of the "waveguide" once the cover is off. Clean it also. Make sure there is no grease or other foreign matter inside there and be sure not to leave anything in there (paper towel piece, etc..). If any of the paint inside the waveguide is burned, and if it can't be sanded off and touched up with catalytic paint, you need a new microwave oven. If the burned area is limited to the waveguide cover and you can't find a replacement, you can buy a sheet of mica material from a parts house and use the old cover as a template to make a new one. Also, "If you are on Gilligan's Island" and can't get any new material, you can cut the burned spot out and cover the hole on both sides of the waveguide cover with cellophane tape. Do this at your own risk but usually it works fine.......

Nov 04, 2013 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

The little grey square of something on the right side of the oven got something stuck on it and it ignited. I cleaned off the grey thing and the oven has worked fine for weeks until somehing got stuck...


A "little grey square" may be a waveguide cover. If so, that is where the microwaves come into the cooking area of the unit. Those covers are sensitive to food splatter and moisture..Anything that gets on it will cook and burn and make a hole there. If not being careful when cleaning you can also make hole. If that is what the square is, the waveguide cover will need to be replaced and any arcing behind it or carbon despoisits from the arcing will have to be completely removed before running the unit again. The unit can be run without the cover for testing purposes it only stops food splatter from getting in to the microwave.Microwaves go right through it, l it i not a safety device to prevent leaking. Remove the cover and put a plastic container of water in the unit. Run it to test it. If it arcs, more thorough cleaning and removal of the burn marks is needed. If not replace the cover and you should be good. Only clean those covers with a DAMP cloth, or paper towel. Do NOT soak them or spray them too hard directly.

Aug 17, 2017 | CDA CM1 Microwave Oven

1 Answer

Sharp R-980A Convection oven - arcing without any metal (except turntable) and smoking inside.


There is a shorted happening when the magnetron release energy. The problem of that is the waveguide already not in focus (already have a big hole on it) hence it scattered the microwave wave elsewhere inside the unit and also to its own metal casing. That cause's to arcing when operating.
Waveguide hole needed to be replace and it need some cleaning & painting of the affected metal (usually near around the magnetron waveguide). Once it's done the unit will not arcing again.
I do hope I answer your problem. Thanks for asking.

Mar 29, 2011 | Sharp Microwave Ovens

1 Answer

I'm getting an arc after about 30 seconds when heating cup of coffee up,arc is coming from rt side grid where light is. Oven was manufactured in 2005. Any suggestions???????? Roy McNeal


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.

It may also be in the area of the turntable support, coupler, or motor.

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.

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.

We have the service manual for this model and have uploaded it for you here.

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.

Aug 22, 2010 | Sharp R-520LK Microwave Oven

1 Answer

When operating arcing appears on right wall there is a burnt hole in plate ad arc is in and behind it


This is due to grease or food particles stuck on and behind the waveguide cover, which is the plate you are describing.

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

If the paint is damaged or charred on the cavity metal, 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.

Since your waveguide cover is damaged, it will need to be replaced.

It provides critical protection for the magnetron.

You didn't mention your brand or model, but you can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.

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

Jul 02, 2010 | Hotpoint RVM1435 Microwave Oven

1 Answer

Sparks in oven


the burning is normally caused by a small particle of food getting stuck on the waveguide cover, this then carbonises and starts to arc. replacing cover should return oven to normal

Feb 22, 2009 | Sharp R-1480 Microwave Oven

1 Answer

Splashes inside waveguide?


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.

In some models it is the plastic ceiling.

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.

If you need more specific help, please reply back with your brand and full model number.

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

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Feb 01, 2009 | GE Advantium SCA2000B Microwave Oven

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