I have repaired quite a few card readers with gummy wheels in the last years. Yesterday I encountered the same problem for the second time. The card reader work after the repair but sometimes the HP-41 is corrupted showing weird symbols or even MEMORY LOST. Sometimes it doesn't let me do a MEMORY LOST manually. But most of the time the machine runs just ok. The HP-41 on its own works perfect. I suspected a bad connection in the module bay. Cleaning didn't bring any success. As this is the second time I tought to ask if anyone experienced the same. It looks like an electronic issue although I thought the card reader only had the usual gummy wheel problem.
Thanks for any help on this
Daniel
HP-41 card reader repair
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