HP-41 Card reader 82104A

[aj04062]

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?

[Raymond Wiker]

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

[aj04062]

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.

[Ignazio Cara (Italy)]

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

[aj04062]

YES,

That's what I was wondering, where was it attached??

Thanks Ignazio!

[Ignazio Cara (Italy)]

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