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二、保护电路维修技巧该机芯的保护电路比较完善,一旦负载电路发生短路故障,就会进入保护状态,不能开机或自动停机,无法看到故障电路引发的真实故障现象。同时,保护时的故障现象与微处理器和电源电路引发的故障现象类似,都是不能开机或自动关机,给维修造成一定难度。维修时,首先要确定是否进入保护状态,然后通过对保护电路的检修,寻找保护的原因,发现引发故障的元器件。一般可采用以下方法。
Second, the protection circuit repair skills The protection circuit of the movement is relatively perfect, once the load circuit short-circuit fault, it will enter the protection state, can not boot or automatic shutdown, can not see the real fault caused by the fault circuit phenomenon. At the same time, the protection of the fault phenomenon and the microprocessor and power circuit caused by the failure phenomenon is similar, are unable to boot or shut down automatically, to the maintenance of a certain degree of difficulty. Maintenance, the first to determine whether to enter the protection state, and then through the overhaul of the protection circuit to find the protection of the cause and found the components that cause failure. Generally can use the following method.