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Make sure there is no metallic trim on the plate or dish you are using.
Older porcelain/stoneware items may have metallics used in the decorative designs and these will not only cause arcing but will be burned away in any microwave oven.
Make sure no metal item (forks-spoons or oven rack) is touching the outer wall of the microwave. That will cause sparks. If all that is OK then there is usually a metal fan type blade in the microwave top called a stirrer blade that may be out of place and rubbing the cavity causing sparks. Try to pin point the spark area so you know where to look for the problem. Sparks usually mean metal is touching metal somewhere.
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check to make sure there isn't any food at the top of the microwave, also, if your microwave allows maybe try turning down the wattage when you cook such as cook on medium or Low wattage.
I worked for a place that repairs appliances and rule of thumb is if a microwave sparks dont bother trying to fix it just replace it.Microwaves work with so many watts sparks could mean a resister is shot witch could be very dangerous and if it stopped functioning thats probably the case.
I will assume that you do not have any metal items or bits of tinfoil lying around inside the oven. If the sparks are happening on the inside of the microwave's cooking area while you are cooking, then make sure you clean the inner surfaces really well. Be sure to remove any cooked on food particles that may have splashed up during cooking.
Most likely you have some corrosion or dried food debris inside the cooking area, or perhaps even some food particles stuck to your WAVEGUIDE COVER PLATE. A dirty waveguide cover plate can certainly cause the arcing and sparking you describe. If the thorough cleaning does not work, you may need to replace the waveguide cover. Here is a link to a short video that shows you exactly how to replace the wave guide cover yourself:
Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the video at the website indicated.
If the sparks are coming from somewhere other that the cooking area, then your unit may need more significant electrical repairs or service.
Here is a link to another expert's excellent Microwave Troubleshooting Guide:
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I hope that was helpful to you, good luck and take care.
If the sparks are happening on the inside of the microwave's cooking area while you are cooking, then make sure you clean the inner surfaces really well. Be sure to remove any cooked on food particles that may have splashed up during cooking.
If the cleaning does not work, you may need to replace the waveguide cover. Click on the following Youtube video link for an instructional video on the process:
The wave guide could be dirty or damaged. Dirty oven interior can also cause sparking. The wave guide is probably not dirty if it's not on the interior of the oven . Some are behind the interior wall .
usually sparks come from turning and cooking with nothing inside the microwave..if there is grease or something on the bottom the heat will generate a spark
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
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