I'm trying to fix one of my hp-12C that insists in display sort of an adolescent behavior, like some teen agers will.
It operates for some 50 seconds to 1,5 minutes, and calculations are ok in this period of time. Then it suddenly crashes, the display blanks and the hp-12C will not respond until I take the cells out and wait for some 30 or 40 minutes.
I've resoldered the contacts (spring and stand) that touch the button cells and rechecked everything from the visual point of view.
Can anyone give a piece of advice here ? Did you experience the same with your Voyagers ?
Thank you
Jose
BTW, it's amazing how few electronics is included in this calculator ! I could find only 2 CI and 2 discrete components. I didn't check under the isolated protection for the display element, but there is no space for many more ICs.