3)检修某种模拟量失控的故障,可以首先检查对应引脚外围元件是否正常,在对应引脚外围元件正常的情况下,可以按照下面的程序进行(见图5): 0～33V 调谐电压以及 B1、B2波段组合电压的作用下,将天线接收的高频信号转变为38MHz 的中频信号,从 IF 端输出。从 IF端输出的38MHz 的中频信号经 3) Overhaul of some analog loss of control, you can first check the corresponding pin peripheral components are normal, the corresponding external components in the normal pin case, you can follow the procedure below (see Figure 5): 0 ~ 33V tuning voltage And B1, B2 band under the combined voltage of the role of the antenna receives the high-frequency signals into 38MHz IF signal output from the IF side. From the IF side of the output of the 38MHz IF signal