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3.解除保护,根据故障现象判断故障范围检修时,也可采取解除保护的方法,通过观察故障现象,判断故障范围。为了整机电路安全,解除保护前,应采取两项保护措施:一是断开行输出电路,在+B输出端接假负载,测量开关电源输出电压是否正常,特别是测量+B电压是否正常,如果不正常,首先排除开关电源故障;二是在
3. To lift the protection, according to the fault phenomenon to determine the fault range overhaul, you can also take the method of lifting the protection, by observing the fault phenomenon to determine the fault range. In order to protect the whole circuit, two protective measures should be taken before the protection is released: firstly, cut off the output circuit of the line and connect the dummy load at the + B output to measure whether the output voltage of the switching power supply is normal; in particular, whether the voltage of + B is normal , If not normal, first rule out switching power failure; second is in