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例1 新科VCD—330型VCD机播放时无图无声,其他操作及显示均正常。分析与检修:根据该机现象分析,控制电路及电源部分均属正常,问题大多在光头或信号输出电路。先打开机盖观察:发现光头物镜干净无污,开机后激光头工作也很正常,再仔细察看发现碟片运行时抖晃严重,估计为压片装置定位螺丝松动所致,使碟片抖晃幅度超过了聚焦线圈的调查范围,经重新调查压片定位螺丝后,机器故障排除。
Example 1 Shinco VCD-330 VCD player without picture silent, other operations and display are normal. Analysis and Maintenance: According to the machine phenomenon analysis, the control circuit and power supply parts are normal, most of the problems in the bald or signal output circuit. First open the lid observation: Found bald clean clean objective, laser head work is also very normal boot, and then look closely discovers that the operation of the disc shaking serious, it is estimated that the positioning device caused by loosening of the tablet device, the disc shaking Amplitude of more than the scope of the focus coil investigation, after re-investigation of tablet positioning screws, the machine troubleshooting.