Re: HP-41CV won't power card reader? Message #4 Posted by Les Wright on 30 Apr 2007, 9:03 p.m., in response to message #3 by Bob Cortopassi
The only thing I can think off is that there is something fishy with Port 4 that renders it adequate to detect the Advantage and Card Reader ROMs but not enough to power the card reader.
I suspect there could be some wear or fraying of the plating on the contacts. I was having weird behaviour in with the card reader in my CV, and on taking the calc apart I noted there was some crimping of the contact along an edge of the male connector for Port 4. I gently flattened the crimping with a thumbnail, gave everything a good clean with 99% isopropanol, and all is fine since.
I don't know if this is your problem specifically, but it seems that the issue is in your fullnut calculator, not in the card reader.
Les
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