Weird behavior HP41c

[Neve]

(10-02-2017 03:51 PM)Geoff Quickfall Wrote:  Both shorting the extreme left to the extreme right battery contacts and the inverted batteries should induce Memory Lost.

Forget the inverted battery method .

I have in extreme cases left the batteries out of the calc for a week with a shorting clip attached to both battery connections mentioned above.

Your two PS's change the diagnosis. It now sounds like a RAM problem. Maybe a loose solder connection on one of the ram chips.

Caveat, the hex nuts were not made to come off and go back on. They self tap and end up cross threading the next time they are used. HP when repairing used spacers in place of the hex nuts.
Have you seen:

Donors for HP41CL

Yes, I had seen the thread a while back.
Well, for some reason, on this machine, shorting the two outmost batterie contacts does absolutely nothing.
I even left a tin foil on all contacts for over an hour, and zilch....
All I can do is try longer and/or wait for the new CL board to be ready and ship out.
At least I have another one (fullnut CX) to play and work with at the moment.
However, it still works and displays all 319 registers with the Quad Memory module. Just that erratic behavior every now and then.

Thanks