Immediately turn off the power , open the case to check , F/8A fuse intact , T ( magnetic saturation of the transformer ) upper secondary high voltage package has been scorched black. When servicing , first unplug the T secondary voltage capacitor C is connected to the plug and insulation tape wrapped with high-pressure , high-voltage secondary load is disconnected . Then power test machine , all indicator lights on the front panel , the screen count display flashes , and there are two " Hello , thank you cards using Heygey appliances ," the voice prompts . Description T primary winding , voice prompts , and electronic control circuits , such as low-pressure part intact .SLbservice manual download site
    Respectively MF-47 -type digital multimeter multimeter and DT890D high pressure microwave generator section for detailed inspection. T by measuring the secondary voltage winding resistance is 100Ω, filament winding resistance 1Ω, normal ; asymmetric Insurance diode D1 positive and negative resistance are infinite , high voltage rectifier diode D2 forward resistance is 150kΩ, reverse resistance is infinite, were normal . Finally, the high-voltage capacitor C after the first discharge measurements , but also intact. At this point, the aircraft can determine the fault was due to T secondary voltage winding insulation breakdown , the formation of inter-turn short circuit, caused by burning fever . So with a 900W microwave oven after a dedicated new transformer replacement ( note transformer terminals with the same name can not be wrong ) Microwave work back to normal.SLbservice manual download site