SY-41CL lock up current drain

[aurelio]

Thank-you Juergen, I asked it because.........
..........my calculator is again locked with "all @s"
screws seems to work correctly, the last time when it happened I succeded in fixing it as you did, loosing and tightening them, but this time I cannot find the right pressure for which the machine is perfectly working!

My brother should call it the "..." point

I'm pretty sure the posts are in a good shape, I feel it, tightening the screws, but there is no way, yet.... I've re-assemled the machine with much care for the RS232 cable path, assuming that its presence could be interfere with the coupling, even I removed it, but it's not that