HP41 card reader repair / opening


Hello fellow HP friends

How do I open the HP 82104A magnetic card reader? I just aquired one that shows the first signs of the "gummy wheel problem", and would like to fix this.

Btw, when I do this, I will take photos, and publish a visual repair guide, if sufficient interest is here.

Best regards


Visual repair guide already done. Start here: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=57 and finish here: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=239

Edited: 23 Sept 2005, 8:45 p.m.


Great, thank you! Stupid me didn't find the articles.

So now I have something to do over the weekend ;-)

I'll tell you how it went.



There are actually two guides in the article archive. But this is such a tricky operation, I don't think a third photo essay would be taken amiss by anyone! 8)


This afternoon, I repaired the card reader. It works fine now.

As promised, I created a small guide with a few images to document it:

Best regards,



Peter, you should add a warning note to your page... Before taking apart the internal mechanism, make a note of the locations of the wires to the read head and motor. They can pop out of the connector pins when you move the motor assembly.


Good idea! Thanks for the hint, I have added a short notice for this.



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