HP 65 Card reader task

[jftman]

I will certainly try swapping the CPU bottom boards.
I hope that the large chip you mention can be eliminated as the reason why the motor does not respond when a card is pushed in lifting the MTR leaf spring ball.

My working readers happily wind up the motor with the card inserted BUT not in contact with the pinch roller and ORing combo. It tells me something will start the motor, even while the ORings do not quite grab the card.

The HP 67 in question is silent, and I test a good connection between pins 14, the plate and 9 the MTR leaf spring. Juice is not heading from the CPU all the way to the motor?

I will switch boards, and post again.