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六、亮度通道的工作原理与故障分析检修 1.亮度通道的工作原理亮度通道由TA7698AP(CD7698CP)①、②、③、④、(20)、(23)、(39)、(40)、(41)、(42)脚与外围元件构成。其主要功能是从图像中频电路输出的彩色全电视信号中、把亮度信号选出来,将其放大、延时,恢复直流电平、勾边、经亮度与对比度控制后,送至色输出电路与三个色差信号相加,还原三个基色信号,在彩管上再现出彩色图
Sixth, the working principle of the brightness channel and fault analysis and maintenance 1. The working principle of the brightness channel Brightness channel by the TA7698AP (CD7698CP) ①, ②, ③, ④, (20), (23), (39), (40), ( 41), (42) feet and peripheral components. Its main function is to select the brightness signal from the full-color television signal output from the image IF circuit, amplify it, delay it, restore the DC level, loop it, and send it to the color output circuit after being controlled by brightness and contrast. Add a color difference signal, restore the three primary color signal, color CRT color rendering