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VCD机无图无声故障涉及到激光头组件、RF放大电路、DSP电路、机心伺服与驱动电路、MPEG-1解码电路、及机心机械等诸多方面。本文仅讨论VCD机能正常出入盘,能读碟,且播放中VFD显示器显示正常时无图无声故障的检修。 VCD机能正常导入TOC且播放时VFD显示正常,说明CD机心及电路、系统控制CPU等均正常,无图无声的故障部位应在MPEG-1解码部分。国产VCD解码器常采用美国C-Cube公司专用VCD解压芯片CL480/CL482/CL484/CL680及美国ESS公司生产的ESS3204/ESS3208/ESS3210等。不管采用何种解码芯片,解码电路基本相同。
VCD machine without picture silent failure related to the laser head assembly, RF amplifier circuit, DSP circuit, servo servo and drive circuit, MPEG-1 decoding circuit, and mechanical heart and many other aspects. This article discusses only the normal VCD access to disk, can read the disc, and VFD display normal playback without graph silent failure of the overhaul. VCD function normal into the TOC and VFD playback shows normal, indicating CD movement and circuitry, system control CPU and so normal, no picture silent fault should be MPEG-1 decoding part. Domestic VCD decoder often use the United States C-Cube company dedicated VCD decompression chip CL480 / CL482 / CL484 / CL680 and the United States ESS ESS3204 / ESS3208 / ESS3210. No matter what kind of decoder chip, the decoding circuit is basically the same.