The fault causes are:CtDservice manual download site

1 high-voltage power transformer winding inter-turn short circuit, or transformer core loose ;CtDservice manual download site

    2 fan blade deformation ;CtDservice manual download site

    3 turntable motor gear wear ;CtDservice manual download site

    4 high voltage capacitor breakdown ;CtDservice manual download site

    5 magnetron anode shorted ignition damaged ;CtDservice manual download site
 CtDservice manual download site
    6 cabinets are mica oil, moisture , etc., resulting in severe short-circuit protection when the machine .CtDservice manual download site

First with 500 multimeter overhaul AC voltage 2500V gear, high-voltage power transformer winding measured AC voltage is 2200V, normal ; measured at both ends of the magnetron filament AC working voltage is 2.7V, normal ; with R × 10k block detects high voltage boost capacitor (1μF/2100VAc) and voltage doubler diodes were normal ; then check the fan blades, cabinets mica, were normal ; finally take off across the primary power transformer plug cable, AC power supply transformer primary voltage directly , troubleshooting .CtDservice manual download site

Restore the original circuit , a microwave and then power on the test machine , turntable motor rotation but found " Jiji buzzing " sound , indicating that the turntable motor is damaged. Replace with a new turntable motor (AC220 ~ 240v/4W) , the machine back to normal ......CtDservice manual download site