HP-41CV Card Reader "Memory Lost"

[Xorand]

(05-31-2022 11:03 AM)BillBee Wrote:  Its possible the reader is screwed but I would test the ports first with a known working module. Sometimes when the ribbon cable is not "fully" connected the calculator will appear to work normally but have odd errors.

-Bill

I had this happen on my previous CV fullnut. Everything else was working fine, but if I stuck a module in port 3 or 4, the calculator wouldn't turn on, or would provide strange characters on the display. Plug the module in 1 or 2 and all was fine.

I pulled it apart and cleaned and adjusted the ribbon cable near the module ports. Put it back together (with much effort due to crumbling plastic posts, etc.) and it worked fine afterwards.