18.switch off follow button , the course gear wheel is free from synchro accordingly.

关随动开头，方位齿轮随后脱开同步机。

19.trun graduated disc of main gyro compass to compl with the graduat disc of repeaters. Then install synchro.

转动主罗经刻度盘到分罗经同一示度，然后装上同步机。