GE LOGIQ P5故障维修

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===    故障现象===

LOGIQ P5开机无反应

===     故障分析===

接通电源，打开机器后面的总开关，按POWER ON键，监视器和键盘灯均不亮，散热风扇不转，机器无反应。重新启动UPS电源以及机器的总开关，都不能激活POWER ON，现场测得UPS的输出电压为222V，说明供电正常。打开机器的总开关后，从机器下方的变压器散热孔可以看到变压器旁边的等待灯是亮起的，说明交流220V己进入机器内部。这时按下POWER ON仍无反应，怀疑机器内部的电源(APS)可能出现故障。

===    故障排除===

打开机器侧盖，观察APS的面板指示灯，只有LPS指示灯闪烁，其它的灯不亮。查看APS的工作原理图，可知LPS是APS的准备指示灯，应处于长亮状态。闪烁说明机器处于保护状态。从机器的母板上测试各连接处的电压，偏离正常值，从而锁定故障是因APS不能正常起振引起的，试更换APS，机器正常使用。

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