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故障现象 接通电源开关,插入一盒节目内容完好的录像带,按下各功能键正常,当按下放像键时,监视器上伴音信号和屏幕上半部的彩色图像正常,但屏幕下半部布满雪花噪点。 分析与检修 按下各功能键正常,说明该机稳压电源和系统控制电路工作基本正常。由故障现象来看,重放时伴音信号正常,说明该机主导轴伺服电路工作也正常。初步判断故障出在机械走带系统或鼓伺服控制电路中。为了迅速确定故障部位,先用麂皮包头棒擦洗视频磁头和CTL磁头,然后插入
Fault phenomenon Turn on the power switch, insert a box of video content intact, press the normal function keys, when you press the play button, the monitor audio signal and the upper half of the color image is normal, but the lower half of the screen Full of snow noise. Analysis and Maintenance Press the normal function keys, indicating that the machine power supply and system control circuit work is normal. From the point of view of the phenomenon of failure, the normal audio signal playback, indicating that the main axis of the servo circuit is working properly. Preliminary judgment of the fault lies in the mechanical tape system or drum servo control circuit. In order to quickly determine the fault location, first with a suede Baotou stick scrub video heads and CTL head, and then insert