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故障现象:光栅上部有细密锯齿波,在有文字或数字符号时,其符号不清晰,符号和垂直线条部分可以明显看到左右慢速移动现象,造成画面多影使清晰度严重下降。但图像下部约1/3处画面正常。而行场都能正常同步,图像稳定,伴音良好。故障检查:根据图像稳定,伴音正常这一特点,初步判断,其通道行场同步部分无故障,而把怀疑的重点放在行输出、行扫描及视放部分。先后更换了行输出、
Symptoms: There are fine sawtooth raster wave in the upper part, in the text or digital symbols, the symbol is not clear, symbols and vertical lines can be seen slowly moving around the phenomenon, resulting in multiple shadow images sharp decline in sharpness. However, about 1/3 of the lower part of the image is normal. The field can be normal synchronization, image stabilization, sound good. Troubleshooting: According to the characteristics of stable image and normal sound, it is preliminarily determined that there is no fault in the synchronization of the channel field and the suspicion is focused on the line output, line scan and video playback. Has changed the line output,