Texas TI-58: Repairing the keyboard bounce and miss to register keystrokes

[jebem]

Rendez-vous time and Testing

After soldering back the keyboard to the calculator main board, it was time for testing.

Power ON, and CLR and typed the sequence "123456789" without looking to the display.
Result: No duplicated entries and no missing keys.

EDIT: I did miss one key entry above. So, bounce is gone but typing too fast can still miss one key register.

It is too soon to say that the bounce issues are gone for good.
But at least it didn't fail so far.



P.S. - One small note for those who want to try this procedure.
The 9 metal dome rows are asymmetric. By mistake, I got the metal rows installed 180 degrees left to right, meaning that I had to solder them at different points from the correct original crimping points. It doesn't affect the normal key registration, though.