Re: HP97 powers on and nothing works. Message #2 Posted by andy on 3 Aug 2004, 11:04 p.m., in response to message #1 by Kadambi S
The gummy substance is from the card reader's drive wheel. These wheels degrade over time and your 97 has the tell-tale signs (gummy subtance on the cards). There are several delicate micro-switches in the card reader. The disintegrating drive wheel may have caused one of them to become stuck in the on-position and this is causing the calculator to hang.
So I would start by replacing your card reader's gummy wheel. While replacing the gummy wheel you will be able to clean all of the switches. I just replaced mine last week utilizing the instructions located elswhere on this site: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=180
The operation was a complete success thanks to these instructions (thanks Mike!). It is a reasonably straight forward procedure but you need to be VERY careful because a slight slip of the hand could make a mess of things.
By the way, the outer diameter of the silcone tubing is ~6.2 mm.
Good luck and let us know how it goes,
Andy
Edited: 3 Aug 2004, 11:17 p.m.
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