Oven lights, turn the tray also shows the primary line is normal, the fault lies in the high-pressure part of the secondary circuit that is, as long as the magnetic flux leakage transformers, high voltage capacitors, high voltage diodes, and other components of one magnetron failure will cause no microwave output, it can not be heated foods. High voltage side of the transformer secondary unplug disconnect the high voltage circuit, range compression failure, maintenance is also more secure. Check the transformer secondary voltage electricity were 1800V, 3.15V, normal. Multimeter power block and then check voltage capacitor, high voltage silicon stack and magnetron magnetron open filament, filament base magnetron pry found filament lead sealing off, use pliers to clamp, weld with a soldering iron, after the machine is working properly.gqZservice manual download site