First, measured with a multimeter microwave power cord L, N-terminal resistance is infinite. So. Open the cover to view: 250V/10A fuse has burned. Retest after replacing the fuse L, N ends of the resistor becomes OΩ. Description furnace has serious short-circuit fault! Which mechanical control microwave oven can be divided from the structure, working principle is: (1) door switch, (2) Time (minutes) setting, (3) microwave set fire to do, (4) tray motor, (5 ) part of the circuit cooling fan, (6) transformer, (7) high-voltage diodes, capacitors and circuit protection (8) emitted microwave magnetron. Overhaul. I take "Break off test" approach, security, easily and quickly find a high voltage from the high voltage diode rectifier diode, capacitance protection circuit (HVM10) short-circuit damage breakdown: The male of a common cathode asymmetric dual rectifier diode (2X062H) side of the breakdown. After replacing the parts with the same specifications, failure to completely ruled out.ZWrservice manual download site