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例1 故障现象:机型(Super PC—XDPS869,通电开机后不读盘,电源伴有“吱吱”的叫声,该机电源原理图如图1所示。分析检修:据故障现象分析判断,由可能因电源负载过重造成电源不能正常工作,造成该故障的原因。一、是主机电路有故障,二、是电源自身故障造成带负
Example 1 Symptom: Model (Super PC-XDPS869, do not read the power after the boot, the power accompanied by “creak” sound, the machine power schematic shown in Figure 1. Analysis and maintenance: According to the fault analysis and judgment , Caused by the power may be caused by overloaded power supply does not work properly, resulting in the cause of the fault. First, the host circuit is faulty, second, the power failure itself caused by a negative