彩色电视机发生逃台或某一频段接收不良的故障时,由于高频头内部电路结构紧凑,不易进行检修。我在检修高频头的故障时,经实践,摸索出一种行之有效、简单、迅速的检修方法——“十字交叉法”,现介绍如下: 在检修过程中发现电调高频头引起上述故障的主要原因是频段切换电路中开关二极管或调谐电路中变容二极管损坏或性能变差,而且这种用玻璃封装的小二极管在性能变差时,往往其光敏性也变得较强。为了便于检查,在检修时可以 Color television sets or a band to escape poor reception failure, due to the compact internal circuit tuner, not easy to overhaul. I am troubleshooting the tuner, through practice, to find out an effective, simple and rapid method of repair - “cross method”, are presented below: Found in the repair process caused by tuner tuner The main reason for the above failure is that the varactor diode in the switching circuit of the band-switching circuit or the tuning circuit is damaged or deteriorated in performance. In addition, the small diode packaged in glass often becomes more photosensitive when its performance deteriorates. In order to facilitate the inspection, the repair can be