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在业余条件下调整彩电“中周”的难点是:因为在调整过程中存在着互相影响的三个变量:即调谐电压、图像检波中周和AFT中周。在许多电子报刊上也多次介绍过该故障的处理方法,但大都不易被初学者掌握。本人在维修中采用黑白电视机的机械高频头进行帮助调整,其方法简单可靠。步骤如下: 一、用机械高频头代换彩电的电调谐器代换时将原高频头的中放(IF)输出引脚与外来的电路断开,把机械高频头的中频输出线接中放电路的输入端,机械高频头的电源供电端(+12 V)接在彩电机内的+12 V上(或电调谐器的“MB”端子上),AGC
In the amateur condition to adjust the color TV “Midwife” is the difficulty: Because in the adjustment process there are three variables that affect each other: the tuning voltage, image detection week and AFT week. Many electronic newspapers also introduced the failure of the treatment, but most are not easy to grasp for beginners. I use black and white TV in the maintenance of mechanical high-frequency head to help adjust the method is simple and reliable. The steps are as follows: First, replace the TV tuner with a mechanical tuner Replace the IF tuner (IF) output pin of the original tuner and the external circuit, disconnect the mechanical tuner IF cable Connect the input end of the discharge circuit, the power supply terminal (+12 V) of the mechanical tuner is connected to +12 V (or the “MB” terminal of the tuner) in the color TV, and the AGC