I got a card reader (via e-bay) that had the gummy wheel problem. Using Dave the "lost rabbit"'s excellent instructions on repairing the hp 82104A card reader, I removed the gummy problem and put it all back together. However, when I pluged it back into my HP-41, it started running immediately and did not stop until I pulled it out of the slot. BTW, I had the calculator off at the time of putting it in and taking it out. I placed the reader back in again and tried to turn on my calculator, but nothing happened. Anyone have any thoughts or suggestions?
HP-41 Card Reader always runs
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