Sony公司生产的PVW系列录像机经常出现一种故障,故障现象表现为:使用小录像带时,录像机工作正常;当使用大录像带时,磁带进入带仓后过几秒就会自动退出。 这一故障的起因是录像机带仓上的大、小带检测、转换装置失灵。其原理图如图1。 Sony PVV series video recorders often have a failure, failure phenomenon is manifested as: the use of small video tape, the video recorder is working properly; when using a large video tape, the tape into the magazine after a few seconds will automatically exit. The cause of this failure is the video tape warehouse with large and small band detection, conversion device failure. The schematic diagram shown in Figure 1.