My microwave Maytag Model MMV4205BAB made a diferent noise and I opened the door once and I saw smoke and burning smell. I dare not plug the microwave again ... what could it be? What should I do?? Can be repairet???

Make sure your microwave is fully cleaned out of any old dried food residue and that you are not using any kind of metal items in your microwave when you cook because this will certainly cause smoking and sparking inside your microwave.

Most like you had some corrosion or food particles stuck to your WAVEGUIDE COVER PLATE.

Here is a link to a short video that show you exactly how to replace the wave guide cover yourself:

http://www.youtube.com/watch?v=M0xsXjhefy4

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.

Thank you very much and good luck