在一般业余条件下更换收录音机磁头,时常会发生这样的问题,即在选配或更换磁头时,往往忽视了磁头的极性,从而导致收录机不能正常录、放音以及音质模糊不清等故障。在给一些采用直流偏磁、直流抹音的收录机更换磁头后,若发生不能正常录音,音量小等问题时,应首先检查磁头极性是否接反。最简单的检修方法是将磁头两根引接线对调后重新焊接,若是立体声磁头,应将两组线头同时互相对调后焊接。另外磁头的外壳接地线应焊牢,绝不能马虎,否则会引起交流杂声和“嗡 Replacement in the general amateur tape recorders head, often occurs when the optional or replacement of the head, the head has often neglected the polarity, resulting in tape recorders can not normally record, playback and vague sound quality and other failures . In some DC magnetic bias, DC erasing tape recorders to replace the head, if not normal recording, the volume is small and other issues, you should first check the polarity of the magnetic head is reversed. The easiest way is to repair the head of the two leads after the transfer of welding re-alignment, if the stereo head, the two sets of threads should be matched at the same time after the welding. In addition the magnetic head shell ground wire should be welded firmly, must not sloppy, otherwise it will cause noise and communication ”Om