Observed failure, the turntable rotates, but not heated, key failure. First check the door switch and replace the fault persists. No inadvertently touched the control panel, the machine has returned to normal, suspected circuit board Weld, but all welding joints failed troubleshooting. Only Shun oven light and turntable control circuit investigation, found and connected to the contactor coil diode D7 open at both ends, and gently touched on the break for the two. He was secretly delighted, turned out to be the diode mischief, with a new 1N4148 substitution failure is still the same, I thought not good and bad elements there, so all components carefully observed with a magnifying glass, and touched with a pen, and found D8, D15 fracture . New ones, troubleshooting. A broken board while three diodes D7, D8, D15, and behave exactly the same fault, but no map control analysis, only knowing but not the why. Happened repaired microwave.9nZservice manual download site