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4.改变原机选台系统频段转换集成电路的用法。有些机型的选台系统使用AN5071、AN5070、LA7910、LA7920等作为频段转换开关。其中AN5070、AN5071和LA7910的引脚排列和功能相同,可以直接互换,既可用于C型高频头,也可用于B型高频头;LA7920适用于TDQ—1型高频头,多用于日立和索尼系列机型中。AN5071的引脚功能为:①输出1、②输出
4. Change the original machine selection system band conversion integrated circuit usage. Some models of channel selection system using AN5071, AN5070, LA7910, LA7920 as a band switch. One AN5070, AN5071 and LA7910 pin arrangement and function of the same, can be directly exchanged, both for the C-type high-frequency head can also be used for the B-type high-frequency head; LA7920 for TDQ-1-type high-frequency head, used for Hitachi and Sony series models. AN5071 pin functions are: ① output 1, ② output