|HP-25 keyboard problem (4 enters 6)|
Message #1 Posted by glauber on 3 Dec 2007, 11:23 a.m.
This is my first post to this forum, but i've been lurking here for a while. A friend just gave me a HP-25, in great cosmetic shape. It's really the cutest calculator i've ever seen, and i'd love to get it back into service.
Unfortunately, in the years it's been stored, the battery had corroded inside the calculator creating lots of gray gunk. I scraped as much of the battery gunk as i could from the battery and the calculator, and got the battery to charge. The calculator powers up and works. However, there is a problem: when i press the digit "4", a 6 gets entered instead (the "6" key also enters a 6). Once in a while, i can get it to enter a 4, but it reverts to 6 again.
I'm having a similar problem with the "1" key: it works fine most of the time, but every once in a while, it will enter a 3 instead of 1. All other keys seem to work correctly.
My current theory is that perhaps some battery gunk has become lodged under the keyboard, but is this possible? Or it could be a short.
Other than avoiding calculations that contain the digit 4, is there anything i can do? So far i've tried shaking, tapping, coaxing and cursing, but none of these seem to have made any effect.