Archon wrote:

Paul Hovnanian P.E. wrote:
This isn't really an electronics repair problem. It might be better solved
on an HP calculator discussion group, if anyone knows the whereabouts of a
decent one.

I have a card reader for an HP-41C calculator (an HP 82104A). I took it out
of storage (a zip lock bag kept in a desk drawer) the other day and plugged
it in. When I fed a card through it, the card jammed and, when I pulled it
out, it had a streak of sticky goo on it. So I disassembled the reader.

It appears that the little rubber(?) wheel that feeds cards through (driven
by a motor and worm gear) has decomposed into the aforementioned sticky
goo. What were these things made out of? What would cause them to decompose
like this? Moisture? How much could there be in a sealed zip lock bag? What
would be a suitable material to use to fashion a new wheel (about 3/8" diam
by 1/8" wide).

Any help? :-
http://www.hpmuseum.org/cgi-sys/cgiw...s.cgi?read=154

JC

That was a good lead. The model addressed has different sized drive
wheels, but this site lead me to one that suggested silicone rubber
tubing for a repair.

Thanks.

--
Paul Hovnanian
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There's plenty of room for all God's creatures. Right next to the
mashed potatoes.