１故障现象一开机听到“啪”的一声，电源保险熔断，走廊空气开关跳闸。故障排除。从故障现象分析，多系电源短路。关机，测量整流桥电阻—桥臂电阻为０Ω击穿，更换一只整流桥，为了防止再有短路出现，摘掉连接光源的导线，打开电源，测量空载直流电源２００V；关机，测量直流 A failure to hear a “bang” when the boot, the fuse fuse, corridor air switch trip. Troubleshooting. From the failure phenomenon analysis, multi-line power short circuit. Shutdown, measuring rectifier bridge resistance - bridge arm resistance 0Ω breakdown, the replacement of a rectifier bridge, in order to prevent the occurrence of a short circuit, remove the light source connected to the wire, turn on the power to measure the no-load DC power supply 200V;