HP Forum Archive 20

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HP-41 Card reader 82104A Message #1 Posted by aj04062 on 6 Dec 2011, 6:55 p.m. Can anyone elaborate on the technique to get the I/O cover off the case? The Service Manual on TOS leaves me wondering how to exactly do this. I am trying to troubleshoot two card readers I have, one does not read cards (Checksum and Card Error messages) and the other appears to have a bad ROM as it is not even recognized with CAT 2. I hope I can make 1 good from both or does anyone have parts?

Re: HP-41 Card reader 82104A Message #2 Posted by Raymond Wiker on 7 Dec 2011, 12:52 a.m., in response to message #1 by aj04062 When I repaired my card reader a few months back, I used three different "recipes" for the work: http://www.hpmuseum.org/guest/hoskins/41crfix.pdf http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=57 http://www.pmgeiser.ch/calc/index.php?id=HP82104A

Re: HP-41 Card reader 82104A Message #3 Posted by aj04062 on 7 Dec 2011, 12:40 p.m., in response to message #2 by Raymond Wiker Thanks, but none of these demonstrate how to get the I/O Port Cover off. I need to take all the boards out as there is either a bad ROM or other component that is preventing the card reader from getting power.

Re: HP-41 Card reader 82104A Message #4 Posted by Ignazio Cara (Italy) on 7 Dec 2011, 1:43 p.m., in response to message #3 by aj04062 Hi Adam, if I have understood well, you need to take apart the cover of the I/O contact in a 82104A card reader. Take a look at these image: Hope this can help you. Regards Ignazio

Re: HP-41 Card reader 82104A Message #5 Posted by aj04062 on 7 Dec 2011, 9:51 p.m., in response to message #4 by Ignazio Cara (Italy) YES, That's what I was wondering, where was it attached?? Thanks Ignazio!

Re: HP-41 Card reader 82104A Message #6 Posted by Ignazio Cara (Italy) on 8 Dec 2011, 4:59 a.m., in response to message #5 by aj04062 Sorry Adam, but I've not understood your question. Can you reformulate the answer? The I/O cover must slide on and off the bottom case until it's locked in its site. Let me know if my answer is clear enought. Ignazio

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