I have just opend one of my HP41CVs. It shows a strange behaviour. It will only run on batteries that are nearly flat. Otherwise it will draw a lot of current and drain them, but not power up. It then needs to be left for several days before it will power up again even on flat batteries. (I suspect a reset problem here)
I downloaded the schematics from Warrens website, but to my surprise found the board to be different. For example the reset transistors are nowhere to be found. Also I don't understand how the power supply works. I was expecting to find a switched mode power supply somewhere, but didn't. How does the battery charging work?
Does anyone have a schemtaic for the apparently different 41CV I have?
Cheers,
Harald