Furnace lights, tray is turning, the primary circuit is normal, the fault out in secondary circuit, the high pressure parts, as long as it is magnetic flux leakage transformer, high voltage capacitor, high-voltage silicon stack, one of elements such as magnetron fails, will cause no microwave output, also cannot heat the food. To carry out plug off high voltage circuit transformer secondary high pressure and compression failure, maintenance or safer. Electricity check the transformer secondary voltage 1800 V, 3.15 V, respectively. With a multimeter electric block check high voltage capacitor, high-voltage silicon stack and magnetron, test results, magnetron filament open circuit, according to the regular replacement of magnetron. But in order to explore the causes of filament open, pry the magnetron filament base, found that the filament lead sealing off, with forceps clamping, its use soldering iron weld, the computer after work.wwxservice manual download site