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例1:开机即烧保险管,说明该机的电源电路有严重短路,故障原因一般在整流、滤波电路。检查与维修:断开300V电压去主、副开关电源电路的跳线J001、J002,测CN01两端的电阻几乎为零,说明整流桥堆BD01损坏。焊下测量,已击穿,换上同型号的整流桥堆,补焊好J002、J001,测量C001两端的正、反向电阻,正常。用调压器将电源电压降低,开机测各组电压输出稳定,然后升高输入电压到
Example 1: boot fuse is burning, indicating that the machine’s power circuit has a serious short circuit, the fault is generally rectified, the filter circuit. Check and Repair: Disconnect the 300V voltage to the main and sub switch power circuit jumper J001, J002, measured CN01 at both ends of the resistance is almost zero, indicating that the rectifier bridge BD01 damage. Welding measurement, has breakdown, put on the same type of rectifier bridge pile, repair welding good J002, J001, measuring C001 both ends of the positive and negative resistance, normal. Use the voltage regulator to reduce the power supply voltage, turn on and measure the voltage output of each group is stable, and then increase the input voltage to