Question about Sharp R-520LK Microwave Oven

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The area around my waveguide cover arced and partially burned (and part of the plastic in the microwave actually looks like it melted and turned black right above but outside) the area of the waveguide cover. The old cover was brittle and the edges were black near the top. so I tossed it. I have located the part for about $12, but wonder if this is fixable. The "sensor cook" feature of the oven never worked from the day I bought it -- 2006. Also, there are no screws to hold the waveguide cover on; it appears it simply slides in behind two little slots -- is it worth fixing?

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Posted on Jan 02, 2017

  • 833 Answers

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

MicrowaveSvc
  • 9047 Answers

SOURCE: sharp 1470 over-the-range microwave - no power on panel

Did you unplug any wires when you took it apart?

Otherwise, I would think one or more of the connectors got unplugged when you removed the control panel.

Another thing that can happen on these models is a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under thebottom edge of the switch. It's usually the top door switch.

You can find the wiring diagram at our site here.

After you look into this, if you still need help, please write back with more details.

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

Posted on Oct 13, 2008

  • 52 Answers

SOURCE: 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

Posted on Feb 23, 2009

MicrowaveSvc
  • 9047 Answers

SOURCE: How do I install a waveguide in a Sharp microwave

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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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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follow this test 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 paint.

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test this steps 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 paint.

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#10#ixzz2aaus0Uj3
http://www.appliancepartspros.com

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follow this steps 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 paint.

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#10#ixzz2aaus0Uj3
http://www.appliancepartspros.com

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see this steps and fix it.God bless you

  • 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.
  • 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.
  • 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 paint

  • Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#10#ixzz2aSjW5F9U
    http://www.appliancepartspros.com

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    Rust or brown spots on window of microwave


    follow this steps and fix it. God bless you


  • 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.
  • 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.
  • 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 paint

  • Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#10#ixzz2aSjW5F9U
    http://www.appliancepartspros.com

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    see the next steps and follow with common sense: God bless you
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    If your waveguide cover and/or stirrer are all OK, then the spark is coming from your magnetron. The antenna on your magnetrom has overheated and burned, sending the microwaves out at the wrong angle. If you catch this microwave oven repair early enough, you can usually get by with just replacing the magnetron. If the arcing has caused servere damage inside the waveguide, you will need a new microwave. Waveguides are not replaceable and most you can barely see into them, let alone sand and re-paint. In this case of microwave oven repair, when you remove the magnetron, you will see the burned antenna, or your magnetron will fail the test bel
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    Inside your microwave, there is a "cover" over the area where your bulb is. If this cover has a burned place in it, or an actual hole in it, then it's your "waveguide cover." And this is the easiest thing to repair. I myself will not attempt any electrical repair, but this waveguide cover was a breeze.

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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.

    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

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