Hi All, I have a Disk II floppy drive that was purchased a while back and was NOS at the time but of course arrived DOA so i started troubleshooting it a whlie back. I have a working disk II here i use as a test machine to move parts/boards, etc..
What it's doing is. on turning on the machine the stepper flapps a bit, and the primary motor spins the disk but the stepper motor never engages and starts moving forward/reverse to any tracks on the disk.
What i have done so far....
1. moved the logic chips from working system to non working. no change.
2. moved the entire top main board from working to non working, both boards work on the working disk II drive.
3. removed the stepper board on the back of both and swapped and both work on the working disk ii drive.
So i assumed it would end up being the board on the back but after intalling the NOS board to old drive it works, so seems all electronics are OK. Is it possible that the stepper motor itself is the problem? It engages OK. I could swap the motors on the drives but at that point my NOS drive won't be NOS anymore but a frankenstein of parts..