【摘 要】
：
故障现象:通电后不能开机,电源指示灯不亮。出现此类故障时,首先通电开机,检查熔丝F1是否熔断。若熔断,则检查副电源输出电压是否正常(正常应为5 V)。若无电压输出,则检查滤
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故障现象:通电后不能开机,电源指示灯不亮。出现此类故障时,首先通电开机,检查熔丝F1是否熔断。若熔断,则检查副电源输出电压是否正常(正常应为5 V)。若无电压输出,则检查滤波电容C33是否失效。若滤波电容C33良好,则检查副电源次级整流二极管D30是否不良。实际检修中,因副电源次级整流二极管D30短路而引起
Symptom: Power can not boot, the power light does not light. In the event of such failures, the first power on, check the fuse F1 is blown. If the fuse, then check the secondary power output voltage is normal (normal should be 5 V). If no voltage output, then check the filter capacitor C33 is invalid. If the filter capacitor C33 is good, then check the secondary power supply secondary rectifier diode D30 is bad. The actual maintenance, due to secondary power secondary rectifier diode D30 caused by short circuit
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