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HR—D660ED录像机是日本胜利(JVC)公司在我国销量较大的一种机型,其电源电路采用脉冲变压器耦合并联型开关电源,当输入电压异常升高时,很容易造成电源开关管损坏。而该管型不易购到,给维修带来困难,现将该录像机电源开关管损坏故障检查和代换提供同行参考。故障现象:接上电源,多功能显示屏无显示,机器不工作。开机检查,发现保险丝F_1熔断,且保险管内发黑,说明电路中存在着较严重的短路故障。换新保险管测
HR-D660ED VCR Japan JV (JVC) sales in our country a larger model, the power circuit using pulse transformer coupled parallel switching power supply, when the input voltage increases abnormally, it is likely to cause the power switch tube damage. The tube is not easy to purchase, to the maintenance of the difficulties, now the video recorder power switch damage inspection and replacement to provide peer reference. Symptom: Connected to the power supply, multi-function display no display, the machine does not work. Boot check, found fuse fuse F_1 blown, and black fuse, indicating the circuit there is a more serious short circuit fault. For new insurance tube test