HP-27 Repair/ACT/Panamatik LP?

[teenix]

I was just thinking, if I was going to test the via for a problem without keyboard disassembly, I would get some small gauge wire and poke it though the via just enough so it doesn't quite touch the "1" button contact when not pressed. Then temporarily solder the other end to a clean part of the gold circuit trace that connects to the via.

If you press the "1" key you should see the wire move up and down.

Reassemble the calculator and try the "1" key. If it works then that was the problem and you have to figure out a proper fix.

cheers

Tony