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在彩电工作原理中,为了消除行、场回扫线设置了行、场消隐电路。该电路从行、场扫描电路中分别取出行、场消隐信号一起加到亮度信号电路中,然后输入到三个矩阵视放的发射极,最后输出到显像管的三个阴极,目的是为了使行扫描逆程和场扫描逆程期间确保阴、栅电压足够大,保证此期间束电流为零,无回扫线。由上可知,产生回扫线的三大原因是:(1)行、场消隐信号输入电路有故障,或输入行、场消隐信号后的亮度通道有故障,使消隐信号不能输入到视放级,此时亮
In the color TV work principle, in order to eliminate the line, the field set back the line flyback, field blanking circuit. The circuit from the line and field scanning circuit were taken out of the line, the field blanking signal together with the brightness signal circuit, and then input to the three matrix as the emitter, and finally output to the cathode of the cathode tube, the purpose is to make Ensure that the negative and the gate voltages are large enough during the line scan and field scan inversions to ensure that the beam current is zero during this period without flyback lines. From the above, the three main reasons for the flyback line are: (1) line, the field blanking signal input circuit is faulty, or the input line, field blanking signal after the brightness channel is faulty, the blanking signal can not be entered As the release level, this time bright