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25, or 4 to 6 [Not Chicago Content]
01-29-2015, 02:17 AM
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25, or 4 to 6 [Not Chicago Content]
I have an HP-25 (non-C), for which I've rebuilt the battery pack and added a 6.3V zener across the battery contacts (not that I've even plugged in the charger, so far - in fact, it's still running on the initial charge in the new NiMH batteries).

It's got a keyboard quirk, though; sometimes pressing the '4' key places a '6' in the display. Repeated keypresses will give strings of 6's and sometimes 4's, and on occasion it will actually kill the display. A bit of jiggling sometimes resolves the problem, and right now it seems to be behaving itself, but the problem comes back after a few days of disuse.

A bit of Googling revealed a post in the old forum from someone with the same problem, but no fix was suggested.

Any suggestions? Without having stripped the calculator down and performed more comprehensive testing and cleaning, I tend to suspect dust under the key, but would appreciate opinions from those with more 25 experience.

--- Les
[http://www.lesbell.com.au]
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25, or 4 to 6 [Not Chicago Content] - Les Bell - 01-29-2015 02:17 AM



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