41c with 785 registers?

[mfleming]

I've seen somewhat similar behavior with 41C/CV models. It seems to be the result of poor electrical connection between the CPU board and the main PCB. One way you *might* be able to confirm this supposition would be to place the calculator on a flat surface, press down on the sides near the bottom row of keys, then power the calculator on. You may first need to reset by pulling the battery pack and shorting contacts.

Pressing the calculator case halves together causes the CPU board to press down upon the flexible zebra connector, which may temporarily establish a better conductive path. With or without a positive result from this test, you will likely need to open the calculator for cleaning and possible repair of broken posts. There are quite a few threads in the forums detailing how to do this type of repair, particularly in the old Articles section.

Let us know how things turn out!
~Mark