Problem with HP 25

[Maximilian Hohmann]

Hello!

(09-16-2024 05:07 AM)krazyk Wrote:  What would you guys do?

I am a big fan of the Woodstock calculators. In the other thread about the three favorite calculators I ranked the HP-25 among those three.

I like the small size, the LED display and the excellent keyboard (unless damaged or corroded). Over the years I have acquired quite a few of them. Only one each of the rare ones (27C and 29C) but multiple units of the common ones (mostly 21 and 25). Some are working perfectly, some have minor faults (like single missing display segments or single keys which do not respond well), some don't work at all.

If you like the extra features of the Panamatik low power module I would go for it. Waiting for another calculator with a failed ACT or display driver chip may take very long. And if you buy a non-working unit, you never know what fault it really has. I have a couple with severe battery leakage that caused different parts of the calculator to fail, e.g. the display or the keyboard. Both can not be repaired if they are in a really poor state.
When you install the Panamatik module, you will have to desolder the ACT and the display driver chips. You can keep these as spares in case you find a damaged calculator some time later. It does not even have to be the same model.

I installed a Panamatik low power module in one of my Woodstocks. It is a very smart device and you will find that the battery is almost always full when you use the calculator. And the memory does not get lost when you turn it off.

Regards
Max