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然后,调节电位器VR706,降低加速极电压,回扫线消除,亮度也可控了。可见,该机亮度失控和满屏幕回扫线的故障原因,是由于分压电路中的电阻R722开路损坏,导致加速极G2电压过高且不可调整造成的。实例15 一台黄山AH5353C/R型遥控彩电,在按下预置开关(PRE—SET)后,可进行自动或半自动搜索,当从频段VL→VH→U→VL搜索完后,可用遥控发射器直接点击选任意频道电视节目,但顺序步进选台失灵,信道号不改变。
Then, adjust the potentiometer VR706, reduce the voltage of accelerating pole, eliminate the flyback line, and the brightness can be controlled. Can be seen, the machine out of control and full screen flyback line failure reason is due to the partial pressure circuit resistance R722 open circuit damage, leading to acceleration pole G2 voltage is too high and can not be adjusted cause. Example 15 A Huangshan AH5353C / R remote color TV, after pressing the preset switch (PRE-SET), can be automatically or semi-automatic search, when from VL → VH → U → VL search finished, remote transmitter can be used Directly click to select any channel TV shows, but the order of step-by-step channel selection failure, the channel number does not change.