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故障现象:开机时正常,时间稍长即出现“三无”,机内有轻微叫声。关机再开机不久故障又复发。当开机时间短还可维持正常,后来故障则频繁出现。分析与检修:该机采用开关电源,故障出现时监测+12V电压慢慢下跌为零,整流输出电压则由40V有所上升。经分析判定为电源部分有的元件热稳定性不
Symptoms: boot normal, a little longer that “three noes”, the machine has a slight cry. Shutdown and then boot again the fault again. When the boot time is short can still be maintained, then the fault is frequent. Analysis and Overhaul: The machine uses switching power supply, the fault occurs when the monitoring + 12V voltage slowly dropped to zero, the rectified output voltage increased from 40V. Analyzed to be part of the power supply component thermal stability is not