Dead 41C?

[Jean-Michel]

Hello

As promised, here you are some news.
I tested what Brad suggested to me, and batteries are good. Surprisingly for such an old device, none of the screw posts is broken. I follow your advice and did not over tighten, Geoff.
Having a closer look at it, it appears that the problem was only caused by a loss of electrical contact at one of the four terminals. The thin copper sheet is worn at the top of the dome, at the location where the battery applies the pressure.
Since I have not much skills in soldering such tiny parts, and probably also not the right tool (my soldering iron seems to big, even if already small), and also I did not want to damage anything, I ended up with a simpler quick and dirty solution: I cut and folded twice a small sheet of aluminum (for cooking use) that I just put between the faulty terminal of the calculator and the battery terminal.
This works just fine, but I would be pleased with a more definitive solution, less fragile. I would also know if aluminum is conductive enough or if copper is better, just in order to have the same current drain at each of the four terminals.
What would you suggest to me at this point?
Many thanks advanced and kind regards.

JM