HP-65 more on the card reader

[Harald]

(02-07-2019 10:39 AM)albertofenini Wrote:  UPDATE 7/FEB/2019

On the other side, what exactly should we measure at the anode driver to see it is noisy ?

Thanks for help to everyone

Just measure the two clock signals on pin 7 and 8 of the anode driver. Both should be clean signals. Phase shifted but otherwise identical. If you measure them on both the good and the bad board, you will be able to tell if there is a difference.

Cheers,
Harald