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业余条件下没有电视信号发生器,因此,彩色电视机换偏转后如何获得调整色纯、静会聚、动会聚用的电视信号呢?下面以夏普NC-IT两片(TA7680、TA7698)机心为例说明获得电视信号的方法。 1.色纯调整用的电视信号的获得 将图像中频系统关闭,使全电视信号为一直流电平,这样就可获得无噪声的纯净的白色图像。以夏普NC-IT机心为例,只需将TA7680的第⑤脚接地即可(VTR开关)。 有些电视机中放无VTR开关则可将线路板上的全电视输出端断开,也可获得无噪声的纯净的白色图像。
Amateur conditions, there is no television signal generator, therefore, how to obtain the color TV for deflection after adjusting color purity, static convergence, dynamic convergence with the TV signal? Here to Sharp NC-IT two (TA7680, TA7698) Example shows the method of obtaining a television signal. 1. Pure color adjustment with the TV signal acquisition The image IF system is turned off, so that the entire TV signal is a DC level, so you can get a clean white noise-free images. To Sharp NC-IT movement as an example, just the first ⑤ feet TA7680 can be ground (VTR switch). In some TVs, the absence of a VTR switch disconnects the full TV-out on the board and produces a pure white noise-free image.