Examination revealed fuse burned black burst. Measurement of high-voltage rectifier diode on the road and high voltage capacitors. Found between the two ends of the resistor capacitor is 0Ω. The plug wire capacitance pin pull down test, the original is in the capacitor connected to the pin and a high-voltage protection tube (Model RG106) short-circuit breakdown. This high pressure can not be purchased due to the protective tube, after comparing a variety of microwave circuit diagram found that there are many models of microwave ovens use high voltage rectifier circuit is not such a high-pressure protection tube. So to simply cut off the damaged pipe without high voltage protection, power test machine microwave oven works perfectly normal.chFservice manual download site