You can't do it yourself. A qualified technician would need to replace the magnetron (the source of the microwave's radiation). However - the cost for parts and labour - would likely mean it would be cheaper to buy a new oven !
It is probably not a good idea for someone other than a technician to attempt any repairs on a microwave oven. The unit has a number of high voltage components inside it, and there a handful of...
Usually means that the magnetron tube that creates the microwave is burned out. I am an EE and when this happens to a microwave I buy a new microwave rather than trying to replace the tube. Fooling...
A microwave transmits waves at just the right frequency to make water molecules vibrate, thus heating anything in range that has water molecules. This can be proven by placing an empty ceramic plate...