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电视机三极管安装图

电视机三极管安装图

浏览：54次 | 提问时间： 08-04 11:08

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6个答案

黑蕾丝Noprnc 08-04 11:09

图片中的现象是加速极电压过高或者尾板的180V供电故障。应先检查尾板三极管的工作状态。因为各个高压包的参数差异，更换了高压包后需要调整显像管的加速极（SCREEN)电压和聚焦(FOCUSE)电压。在高压包上有这两个调节旋钮。先加速极，后聚焦。加速极电压的调整较复杂，步骤是：1】将主板上的维修开关（一般在场IC附近）拨到维修位置，此时屏幕为一横线；2】调整加速极（SCREEN)电压为横线为最低亮度即可。如果这条亮线不是纯白，还需要调整显像管尾板上的三个有颜色的电位器，这个调整会影响亮线的亮度需要配合一起修正加速极电压，反复几次；3】恢复维修开关位置，加速极电压调整完成。聚焦电压调整相对简单，在电视机亮度适当的条件下，调整到图像最清楚即可。将电视机彩色关掉，如果图像偏色，需要微调显像管尾板上的两个没有颜色的电位器来调整白平衡。要达到最好效果需要重复几次以上过程。至于那只二极管，不知道你所指，无法回答。但可以肯定的是，如果尾板的180V供电故障，显像管失控憨甫封晃莩浩凤彤脯廓，也会出现你图片中的现象。