First check the microwave power supply is normal. Open the microwave enclosure, check the fuse blows found inside the machine, and for a 10A fuse, power test, the fuse has been blown. The transformer secondary voltage capacitor and unplug the connection point, and back with a 10A fuse, start working properly. Fault occurred in the transformer secondary circuit that detects high voltage diodes, magnetrons were normal. Detection of high-voltage capacitors, found its chassis (ground) short circuit, causing power on immediately burning fuse failure. Replace the same type of high-voltage capacitors, troubleshooting.nnHservice manual download site