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一、电源电路的检修1.主电源无输出故障分析(1)保险丝熔断。①开机瞬间消磁电流大而损坏。②整流电路中整流二极管击穿,300V 高压滤波电容击穿或严重漏电,以及开关管击穿等。(2)保险丝完好,测开关管漏极是否有电压。①若无电压,检查开关、电源线、限流电阻是否开路。②若有300V 电压,电源仍未输出,则说明电源开关管没工作,常见故障原因有:启动电路开路、开关管
First, the maintenance of the power circuit 1. Main power output failure analysis (1) fuse blown. ① instantaneous demagnetization current is large and damaged. Rectifier circuit rectifier diode breakdown, 300V high voltage filter capacitor breakdown or serious leakage, as well as switch breakdown. (2) Fuse intact, measuring the drain of the switch tube for voltage. ① If no voltage, check the switch, power cord, current limiting resistor is open. ② If 300V voltage, the power supply has not yet been output, then the power switch does not work, common causes of failure are: start circuit open, switch