论文部分内容阅读
国内现有组装的德国沙巴(SABA)牌51cm遥控彩色电视机总数约10万台。该机主电路与组装的法国汤姆逊51cm彩电相仿,只是某些主要元器件及局部电路略有差异。因此它们的维修方法是相似的。该机元件质量较好,其故障率亦低于汤姆逊机型。它具有电脑选台、红外遥控等功能,因大量采用微型无引脚电阻(直接贴焊)等超小型元件,排列密度高,其线路与国产彩电有较明显的差异,维修起来难度较大。笔者将整理出来的较有代表性的五例维修札记,供读者参考。例一,伴音正常,无图像,屏幕为纯净的紫红色,调整色饱和钮,将紫红色调成白色后,屏幕上无回扫线,在无节目的频道,屏幕上无雪花噪点。从上述现象看,本机开关电源、场行扫描电路、公共信号通道、伴音电路和CPU微机控制电路工作是正常的,而在解码电路、视频处理电路可能存在故
The existing assembly of the German Sabah (SABA) brand 51cm remote control color TV total about 100,000 units. The main circuit of the machine and the assembly of the French Thomson 51cm color TV similar, but some of the major components and local circuits slightly different. So their method of repair is similar. The machine components better quality, the failure rate is also lower than the Thomson models. It has computer selection, infrared remote control and other functions, due to the large number of micro-pin-free resistance (direct affixed welding) and other ultra-small components, high density, the line with the domestic color TV there are more obvious differences, more difficult to repair. The author will sort out the more representative of the five cases of maintenance notes for readers reference. For example, the sound is normal, no image, the screen is pure fuchsia, adjust the color saturation button, the fuchsia color into white, the screen without rewind line, no program channel, no snow noise on the screen. From the above phenomenon, the local switching power supply, field-line scanning circuit, the public signal channel, audio circuit and CPU microcomputer control circuit is normal, and decoding circuit, the video processing circuit may exist