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黑白电视机出现有光栅、无图像、无伴音的故障是十分普遍的,故障范围也较明确,但要找到故障点却有一定的难度。此类故障范围一般集中在通道部分。修理该故障通常有两种方法:一种是用“碰触法”判断故障部位,这种方法简单、方便,可提高检修速度,但不能准确判断故障点;另一种方法是测“直流电压法”,通过测量通道各级静态工作点的电压,进一步确定故障点。把两种方法结合起来运用,会起到事半功倍的效果。下面就不同机型的检修步骤分别分析。一、分立元件的黑白电视机以北京842机型为例,检修时首先用“碰触法”分
There is a raster black and white TV, no images, no sound fault is very common, the scope of the fault is also more specific, but to find the point of failure there is a certain degree of difficulty. The scope of such failures is generally concentrated in the channel section. There are usually two ways to repair the fault: one is to use the “touch method” to determine the fault location. This method is simple and convenient, can improve the speed of overhauling, but can not accurately determine the fault point. Another method is to measure the “DC voltage method ”, By measuring the static voltage at all levels of the channel voltage to further determine the point of failure. The combination of the two methods, will play a multiplier effect. The following different types of maintenance steps were analyzed. First, the discrete components of the black and white TV to Beijing 842 model, for example, the first maintenance with “touch method” points