After several consecutive weeks this machine processed foods have serious burnt taste, then no heating capacity. Charles microwave magnetron normal, but found around the microwave oven cavity output window has a big piece of charred, blackened most serious insulating mica. Try the blackened part of the oven cavity sanding with emery cloth, wipe clean with alcohol around, and then use the white (similar to the original color) from paint spray three times, until the paint dry (about 20 minutes later), put new insulation mica. Power test, troubleshooting.biBservice manual download site