In the absence of tape, the camera appears after the tape is closed. Please check the write protection.

When the tape detection contact switch of the movement fails, there are two situations:

1, always open, never think of a tape (even if the tape is there, you won't know how to put it away)

2, normally closed, thinking that the tape is in place (always thinking that there is tape). When the write protection detection contact switch works, it will be mistaken for a tape and cannot be recorded.

It seems that you belong to the second category.

Try listening to the tape over and over again. If it can't be restored, it needs to be repaired (the new machine can be guaranteed). There is no need to repair the old machine (because there is nothing wrong with the mechanical part of the movement, but the contact switch is faulty), which will not affect the work. ...