HP-71b Card reader "WRN: R/W Error"

[Joe Horn]

(11-10-2018 09:23 PM)Nenad (Croatia) Wrote:  a) What should I try next to make my card reader work.

IIRC, if the timing track on a card gets messed up, the card will never work correctly, so the problem MIGHT be that particular card. So I'd suggest trying as many other cards as you can get your hands on. If NONE of them work, then the problem probably lies elsewhere.