HP-65 Card Reader Problem Help

[Dave Frederickson]

If we consider that the 65/67/97/41 card readers are similar, then motor speed is rather important. That's why the 41 diag ROM has a specific card reader speed test and the 97 service manual has an extensive section on adjusting the motor speed.

I highly recommend you watch Geoff Quickfall's video from HHC 2014 on card reader repair.



Pay particular attention to the part about the "clutch" which is really a dampening coupler.

Edit: The HP-67/97 uses the card reader for the HP-65 so I think the HP-97 service manual is a good reference. The HP-41 card reader has closed-loop speed control whereas the earlier card reader uses an open-loop design.

Dave