HP 41C Battery Contacts (Cleaning?)

[ColinJDenman]

(09-24-2014 03:54 PM)jebem Wrote:  

(09-24-2014 12:33 PM)Eddie W. Shore Wrote:  The stuff on the contacts is stubborn! Between the white vinegar and the card it seems little has come off. (half an hour)

I am going to rub some alcohol (isopropyl) and let it dry during the day.

The cleaning procedures you are doing are good enough to remove recent leaking on the outside, but what about the inside? Leaking goes everywhere usually.

In my case, I note the corrosion is limited to battery connections 1 and 3 (when viewed from the back of the calc 1-2-3-4). No corrosion on 2 or 4 or on any of the module contacts (which are part of the same flex circuit. See http://www.hpmuseum.org/forum/thread-1889.html for info on obtaining and replacing the flex connector).