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长虹系列VCD机有3000,6000,8000,9000等型号,其解码板上的解压芯片为美国斯高柏公司的CL484(3000,8000型视频转换编码用SAA7185),CL680(6000,9000型)。采用索尼和飞利浦机芯。装入VCD碟片后,可读出TOC(目录内容),显示总曲目和总时间,按播放键,曲目的时间秒、分连续跳跃,表明系统控制(主CPU CH52011,UPD78014,P87C54)、机芯微处理器(子CPU OM5234等)、伺服系统、RF放大、DSP处理、电源、显示屏等几部分基本正常。如果表现出如下故障现象时重点检修解码板电路:①图像正常,无声音;②声音正常,无图像;③声音正常,图像彩色异常;④伴音出现阻塞,马赛克频繁出现;⑤无图像,无声音;⑥声音正常,图像无彩色;⑦声音正常,图像杂乱无章;⑧未播放结束又返回重新播放;⑨有时不读碟;⑩播放VCD片时显示CD;⑾制式转换不正常;⑿屏幕字符显示不良;⒀噪声大音小;⒁
Changhong series of VCD machines have 3000,6000,8000,9000 and other models, the decoder board for the decompression chip for the United States Szabo company CL484 (3000,8000 video coding SAA7185), CL680 (6000,9000 type). Using Sony and Philips movement. After loading the VCD disc, you can read the TOC (Contents Contents), show the total track and total time, press the play button, the track seconds, continuous jump, indicating that the system control (main CPU CH52011, UPD78014, P87C54) Core microprocessor (sub CPU OM5234, etc.), servo system, RF amplification, DSP processing, power supply, display and other parts of the basic normal. If it shows the following fault phenomenon, it will mainly repair the decoder board circuit: ① normal image, no sound; ② normal sound, no image; ③ normal sound, abnormal image color; ④ sound obstruction, mosaic frequent; ⑤ no image, no sound ; ⑦ sometimes not read the disc; ⑩ CD player shows VCD; ⑾ system conversion is not normal; ⑿ screen character display is not good ; ⒀ small noise loud; ⒁