Re: Problem with HP41CX Message #2 Posted by Vieira, Luiz C. (Brazil) on 25 May 2002, 10:54 a.m., in response to message #1 by Dennis
Hi;
the contacts for each key in the HP41 are built with a metal bubble (flat) carefully positioned over the keyboard's PCB. All the keys are locked with a self-adherent plastic stick.
Right bellow these bubbles there is a small hole that allows access to the "inside" of the key's contact assy. I read many stuff in here about how to clean their inner guts, and people suggested using chemical cleaners that would not dissolve the plastic cover nor the glue, so they would not disturb the contacts.
I got good results by using thin brushes, thin enough to have their coats inside the small holes. Carefully rotating the brush would allow cleaning the contacts.
I know it sounds vague, but try looking in here, maybe May-December 2001.
Good luck and best regards.
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