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检测Q4的⑥脚若无电压,说明Q4的振荡电路不工作或Q4管已损坏,而造成无直流电压输出。此时应测量R5(取样电阻)上的降压,若无电压说明R5断路,若电压正常,应更换Q4集成块。
在排除此类故障时,可不通电,用三用表电阻挡,检测各元件是否断路。
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2 保险丝熔断、无电压输出
通电开机后保险丝熔断,说明开关电源电路内有短路点。排除此类故障,首先断开电源,然后观看各元件,器件有无异常情况,如碳化发黑、断裂、电容器鼓包或电解液外溢等。发现有上述异常情况先更换之。若无异常情况,用三用表电阻挡从输入端开始依次向后检测各元件、器件的短路情况。应先重点检测R1、D1—D4、C6—C8、Q1、Q4、B①—②绕组线圈及输出电路的各滤波电容是否被击穿短路或某元件绝缘不好严重漏电。检查无问题或排除故障后,方可更换新保险丝进行通电观察开关电源工作情况。
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