First, disconnect the high voltage side of the transformer, after the change of insurance, the insurance will not burn, indicating that the high-pressure side of the element is faulty, measuring high voltage capacitor after discharge resistance is 10M Ω, normal, and then measuring the magnetron filament of the shell resistance is 0Ω, illustrate the magnetron filament shorted the shell and put LGGAL101 magnetron power, measured with a clamp whole current of 4A, the furnace is heated in a glass of water within two minutes, the repair is completed!UAeservice manual download site