HP 65 Card reader task

[jftman]

Ok.
I can set it at 4v, and repeat. But after I turn the calculator on, the output drop alot, Vss

You gave me instructions that p17 should have 6v, greater than Vss? But the diagram shows p19 reads 6v. And p17 is not labeled.

So, if I set the 4 volts is that going to be AFTER the on switch is on?
I can guess that the chip is an amplifier as denoted, is this why 6v appears in the diagram, if the Vss is less than 6v?

I do not see six ish volts on p17 during the first test. With a reiteration what show my reading be on p17?
Mainly, I should switch the calculator on, and dial up 4 volts, then test?

That is essentially what it seems I did. When tge calculator was on and I was making readings the bench showed about 4.2 volts.
With calculator OFF the jumpers had 5.25 ish potential available.