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故障现象:伴音正常,但无图像分析检修:此机于1999年10月购买,11月出现故障。用户同意为其检修。开机盖,发现该机制作精良,工艺考究,属于精品。解码板采用最新斯高柏芯片(c-cube)MPEG2(CL8830—P208,共208只引脚),无资料可查,便自行测绘出部分线路图(如图1所示)。根据解码器工作原理可知,应检查视频编码电路。此机的视频转换(D/A),编码等视频信号处理均在U40(SAA7121H,有44只引脚)集成块内完成。
Symptoms: normal sound, but no image analysis Maintenance: This machine was purchased in October 1999, in November failure. User agrees to overhaul. The boot, found that the machine made sophisticated, sophisticated technology, are boutique. The decoding board adopts the latest c-cube MPEG2 (CL8830-P208, a total of 208 pins), no information can be found, they plotted some of the road map (Figure 1). According to the decoder works, we should check the video coding circuit. This machine’s video conversion (D / A), encoding and other video signal processing are U40 (SAA7121H, 44 pins) integrated block to complete.