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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。

孤巷 08-04 11:17

C144是NPN 型带阻三极管,可用C1815型的在基极串一10K电阻,基极与发射极并一10K电阻代换即可

王者之吻 08-04 11:25

是基极,是e.c.b,不错

八月未央 08-04 11:34

在机顶盒内靠近LNB天线头那里,一般常见的型号是s8缉阀光合叱骨癸摊含揩550,实在断定不了是哪个管的话,测那里电压,水平极化时,该管一般输出接近20V,垂直极化一般输出在15V以下,

提你我会慌 08-04 11:42

都有点忘记了黑白电视机电源取样三极管坏了会出现无图无声有光栅吗?好像是无图无声无光栅吧,好多年没修黑白了

同行 08-04 11:51

A2 这是一个开关管 需要详细的参数介绍说明可以留个联系方式我发给你

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