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按电源开关,指示灯亮(红色),按待机键,指示灯由红色变为绿色闪亮一下,同时听到行起动声,随即便出现“三无”现象,此时测+B电压为零。断开行负载,接60W灯泡作假负载,实测+B为109V,其他各组电压也有相应的下降,伴有轻微的“吱
Press the power switch, the indicator light (red), press the standby button, the indicator light changes from red to green, while hearing the line start sound, then there will be a “three noes” phenomenon, this time measured + B voltage is zero. Disconnect the line load, then 60W bulb for dummy load, the measured + B is 109V, the other groups have a corresponding voltage drop, accompanied by a slight "squeak