Well if you keep on running your microwave without any thing in it then yes! it burns out the magnatron
(thats the bit the heat come from) and when there burned out its a dust bin jod as there very pricy to by and its not a smart thing to do trying to fit a new one by yourself,, you stand a very good chance of just killing yourself first,,to test your microwave opn the door put inside a cup of cold water and turn on the microwave for 3 mins on full power, the water should be boiling by then,,,dont put anything in the hot water like milk or it could explode in your face! just tip it away
Testimonial: "thank you I was wondering if it would be wise to buy a new one. I appreciate your time "
It's actually a stirrer. Its purpose is to scatter the microwaves to ensure even cooking, similar to the way a turntable does in other models. Having a stirrer instead of a turntable allows for a bigger dish.
The sparking is usually caused by deposits or grease or food debiris which heat, reheat and arc.
If the oven is used very long without the cover, that debris and grease can get onto the magnetron and ruin it.
You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383
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