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(一)故障现象电源不能开启,电源指示灯也不亮,一切操作功能都不行。(二)检查分析机电源是一个独立的组件,由于没有电路图,只好根据实物将其电路绘下来(如图1)。通过分析可以知道电源工作不受电源开关控制,只要插上电源插头,供电就可直接送至机内主底板。电源开关受微机控制的可能较大。不能开启电源的原因,除电源本身可能有故障外,还可能是系统控制电路有问题,或机内其他地方的故障导致微机产生抑制,因自动保护而打不开电源控制门。
(A) Failure phenomenon Power can not be turned on, power indicator light is not bright, all operating functions will not work. (B) check the analysis machine power is an independent component, because there is no circuit diagram, had to draw its circuit according to the kind (Figure 1). Through the analysis we can know that the power supply is not controlled by the power switch, just plug in the power plug, the power supply can be sent directly to the machine main backplane. Power switch by computer control may be larger. Can not turn on the power of the reasons, in addition to the power itself may be faulty, but also may be a problem with the system control circuit, or other parts of the machine failure led to microcomputer to suppress, because of automatic protection and can not open the power control gate.