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例1 故障现象:当市电供电时,有输出,正常指示灯亮,但充电指示灯不亮,蓄电池不能充电。分析与检修:故障现象说明,充电电路有故障,充电电路如图1所示。变压器次级输出的交流电压经整流桥整流后,输入至稳压集成电路LM317的①脚,由
Example 1 Symptom: When mains supply, there is output, the normal indicator light, but the charge indicator light, the battery can not be charged. Analysis and Overhaul: Failure phenomenon shows that the charging circuit is faulty, charging circuit shown in Figure 1. Transformer secondary output of the AC voltage rectifier bridge rectifier, the input voltage regulator IC LM317 ① feet, from