彩色电视行场扫描电路分析与常见故障检修

Analysis of line-field scanning circuit of color television and troubleshooting of common failures

行场扫描电路是彩色电视整机的重要组成部分,其主要作用是在显像管的荧光屏上产生正常的光栅。光栅是显示图像的前提,电视屏幕上要想正常地显示图像,行场扫描电路必须工作正常。以熊猫2138A彩色电视为例,简述了行场扫描电路的基本工作原理,并结合典型故障实例详细介绍有关行场扫描电路部分故障的判别与检修方法。

The horizontal and vertical scanning circuits are an important part of color television.In order to display a normal image from television screen,the normal raster image plays an important role,in that the horizontal and vertical scanning circuits must be working properly.This paper describes the operation principle of the horizontal and vertical scanning circuit of the panda 2138A color television,combined with detailed examples of common failures of the horizontal and vertical scanning circuit,some methods of identification and troubleshooting are introduced.