HP-41C weird program behaviour

[JurgenRo]

(03-22-2023 01:27 AM)rprosperi Wrote:  If that program will not run, entered after a reset, then there is definitely some kind of hardware issue with the machine.

Remove the batteries
Short the outermost 2 battery contacts
Press [ON] and toggle a few times
Let it sit with no power for 24 hours

Then put batteries back in, do a RESET ([<-]+[ON]), enter only that program, [GTO] [ . ] [ . ] to pack and then run it. If the problem remains, you need some h/w repairs, and I'm afraid I am not the right guy to tell you what part(s) may be the cause.

Good luck and please report results.

Thanks again, Bob. Already tried everything except of "Let it sit with no power for 24 hours".

May I asked another question? I have another 41c that runs faultlessly. But after a couple of hours (> 12 or so) of inactivity it won't turn on again. Removing and re-installing batteries it would work sound again. After a couple of hours (> 12 or so) of inactivity it won't turn on again ... you guess how the story progresses ;-) Any ideas on this strange behaviour?