I just finished fixing up a Mac 512K. It works like new, including the internal floppy drive.

But the external 400K drive is making me mad. It is a SONY OA-D34V-22.

At first, the mechanism was stuck. This was easy to remedy. I also noticed that the pressure pad was missing.

But then, when I inserted the disk, it immediately says it is unreadable.

I found out that the motor doesn't even spin. Even if I took the floppy out and used a screwdriver to press down on the optical interrupter, the motor didn't spin.

But in the 1 of 10 attempts, I did managed to spin the motor for about 2-3 seconds. Once I even got a floppy to read (using a makeshift pressure pad) and it mounted on the desktop.

So essentially, there must be something wrong with a motor or a motor control. Perhaps something else?

Any ideas?

EDIT: I discovered that if I spin the motor with hand, and press on the optical interrupter while it is still spinning from inertia, the motor will spin on its own for a sec or two.