Looking for HP41CX Advice

[Massimo Gnerucci]

(08-08-2021 09:58 PM)GreyUser Wrote:  

(08-08-2021 09:24 PM)Massimo Gnerucci Wrote:  All of my TK 41s are working, with original parts.
Call me lucky. :)

I would be very surprised to learn that any 41C was still working with the original pink elastomeric cpu board connectors. The resistance new was usually around 1K and just like carbon composition resistors, the resistance goes up over time. The battery connection pin is the only one that matters since it’s the only one with any appreciable current being passed through it.

My own first TK (1953A) - I know since I had to open it for cleaning - had the second type connector, not the pink one.
I don't know what's inside the other three. Maybe the pink one is in the 1930A unit (that reliably works, BTW)...