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(2)对于过电流保护电路,可测量D206的负极电压判断保护电路是否启动。D206的负极电压正常时为高电平,如果开机后保护前的瞬间D206的负极电压为低电平,则是过电流保护电路启动,应检查负载电路是否发生短路漏电故障,可拔掉连接器CN803,接假负载对开关电源电路进行检修,判断故障在负载还是开关电源板。确定保护之后,可采解除保护的方法,开机测量开关电源输出电压和负载电流,观察故障现象,确定
(2) For the over-current protection circuit, the negative voltage of D206 can be measured to judge whether the protection circuit is started or not. When the negative voltage of D206 is normal, it is high level. If the negative voltage of D206 is low level immediately after power-on, the overcurrent protection circuit is started. Check whether there is a short circuit leakage fault in the load circuit, and unplug the connector CN803, then leave the load on the switching power supply circuit repair, to determine the fault in the load or switching power supply board. Determine the protection, can be taken apart from the protection of the method, the power switch to measure the power output voltage and load current, observe the phenomenon of failure to determine