HP82104A Card Reader repair - help needed

[BobVA]

(10-12-2015 12:45 AM)Rsponholtz Wrote:  When I try to read that card back in, I still get a "CARD ERR".

Kind of a left-field possibility, but if you can borrow another HP-41 it might be worth trying the reader on it.
I had a card reader I thought was malfunctioning and it turned out to be a bad interconnect in the HP-41. The card reader really stresses any high-resistance connections that can otherwise go unnoticed.

Bob