Hi folks,
after successfully reviving the card reader in an HP-65, I tried the same on an HP-97, but no luck.
I replaced the gooped up pinch roller with silicone tubing and glued the clutch. While I can consistenly read the preprogrammed cards, there's no way in hell I can write and subsequently read a blank card, no matter how I adjust the roller's eccentric shaft. Writing usually occurs without an error, but when a read error occurs, the card reader suddenly speeds up just as the card exits, as if it was trying to read beyond the end of the card.
I then resorted to fiddle with the leaf switch adjustment screws as a last ditch attempt, but no luck there either.
The motor warbles audibly and sounds like it fluctuates in speed. I've tried 3 different pieces of tubing for the roller, with the same results. I suspect the clutch itself is eccentric. Running the motor by itself from a bench supply also produces noticeable flutter.
Any hints before I give up?
Regards,
--Roland