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(三)伺服电路不良引起的“马赛克”故障 VCD机的纠错能力主要取决于DSP芯片,但DSP芯片的纠错能力是有限的,当超出其纠错范围时,必然会产生人见人烦的“马赛克”现象,最大限度地减小误码是靠激光头、系统控制、机械部件和伺服电路综合完成的。当判断激光头、电源无故障时,此时应重点查伺服电路是否正常,常见方法是: 1.用示波器观察TE、FE波形是否正常,TE波形是否上、下对称,基准电压是否正常(一般为2.5V),
(C) the servo circuit malfunction caused by the “mosaic” fault VCD machine error correction capabilities are mainly dependent on the DSP chip, but the DSP chip error correction capability is limited, when beyond the scope of its error correction, will inevitably be annoying The “mosaic” phenomenon, to minimize the error code by laser head, system control, mechanical components and servo circuits completed. When judging the laser head, power failure-free, this time should focus on checking whether the servo circuit is normal, the common method is: 1. With the oscilloscope to observe TE, FE waveform is normal, TE waveform is symmetrical, the reference voltage is normal Is 2.5V),