HP 65 Card reader task

[jftman]

(01-27-2024 07:49 AM)teenix Wrote:  I would limit the battery voltage to no more than 4V in case something gets damaged.

The attached image is a copy of Tony Duell's circuit for the HP-65 sense board.

The contacts at right are the pins connecting the sense board to the CPU board.

I marked the voltages when a card should be reading with motor active.

cheers

Tony

My experience shows no voltage on p1 hence the motor can't run.
Under operation during the test, p11 does not move from open in continuity mode.
(Or should I leave the volts meter in Vdc and read 0volts, NOT ohms to ground? On p11……
Sorryy…!