Interesting HP-65 card reader failure mode

[John Garza (3665)]

Thanks Tony,

That g Rv is 'roll down'. The lowercase V for the downward pointing arrow.

And I did try swapping out the CPU card with one from a known good 65. No change.

Since everything was working before I touched it for the coupler work, I'm thinking it is likely something I've touched. Perhaps even handling the motor by pushing the new coupler on the shaft may have been too much for a worn motor. I'll try a spare motor first, then the 15 uF cap on the sense board. If neither of those help, maybe the head or leaf switches. Although I didn't tear down the machine to the level of the leaf switches when I replaced the coupler - I just removed the motor from it's mount. I also have a spare frame with leaf switches and head. And a few spare sense amp boards. It's fun troubleshooting all this!

-J