Question about Sharp R-1480 Microwave Oven

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Microwave ovens What is the little rectangular cover inside the oven and usually to the right hand side do.Mine has started sparking when cooking. When I started the microwave oven I noticed sparks coming from the right side behind the cover I turned it off and unplugged it I completely wipe the inside of the oven clean and washed the turntable after drying everything I plugged it back put something th cook in it and it statred to spark again. I previously left some bread in a metal bowl for several hours but the oven was never on at the time.

Posted by on

  • paco kid Dec 18, 2007

    Thank You for your help I took the cover off and discovered

    it had a burn spot and crack in it. after reading your advice

    I called a local appliance parts place and was told to bring

    the cover I did he took a sheet of the same material traced

    my cover and cut me a piece to match he said clean the

    area behind the cover and let dry replace the cover and it should

    work I did and it's working great.he said that when the covers

    burn or get dirty sparking will occur best five bucks I've spent

    save me from replacing my oven which I really like for it's




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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


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Sparks when starting then goes to pause mode

see this next steps. God bless you
If you see arcing or sparking inside a microwave, turn unit off immediately. Arcing can be caused by having something metal in the oven cavity touching a side, an oven shelf is touching the side of the cavity, an oven shelf support has broken, microwave waveguide, or bad magnetron.
If your microwave has a shelf in it, and you do not use it, keep it out. If one of the shelf supports breaks or comes out, the microwave will arc where the support was. You will have to sand the spot down, paint with appliance paint and re-install support. If the shelf shifts on the support and touches the side it will arc.
Your magnetron waveguide will either come out of the top, or side of the oven cavity. Some will have a stirrer in it(mostly top waveguides) with a panel over, or just a cardboard type cover over it. Over time, the stirrer cover can become warped from the heat which will expose the stirrer's metal shaft which will then cause sparking. These covers and stirrers come in a kit and can be replaced from inside the oven cavity.
Your cover over a side waveguide is coated with a substance on it, and overtime this coating can come off from the heat and moisture in the microwave. These waveguide covers are very easy to replace from inside the oven cavity. Touch up any paint that may have chipped or come off because of the arcing.
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 below.


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Can't tell you much about your little rectangle, but sparks can result from left over food particles that got carbonized, and a good cleaning might get rid of it, unless you like looking at the sparks(I heard you shouldn't stare at a microwave while working though, washing machines are safer). make sure you unplug it while cleaning or doing anything else, those micros are dangerous as hell. Take care

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