Encoder Wiring on Mesa 7i77 board

Thanks for the help but I think the problem is in the MESA 7i77 board. I have been checking the continuity of all my encoder wiring to make sure I have everything hooked up and I happened to check the continuity between the +5Vdc terminal on Encoder0 and the ground terminal on Encoder0 of the Mesa 7i77 board and the two are shorted. After that I checked the power and ground terminals on all six of the encoder terminal blocks on the Mesa 7i77 board and for all the encoders the power terminals are shorted to ground. This does not seem normal to me so I will need to contact Mesa to figure out the problem before continuing.

There is _no_ question that you damaged the card initially, reverse protection diodes
dont just fail (along with both driver chips on the same power rail)

The driver chips passed a digital loopback at 24V but on further examination did not swing fully to 24V
so this was missed on the first return.

If 5V and ground are truly shorted its likely you damaged the 5V side of the card also

I was kind enough to repair a card that had been abused as a warranty repair, I will not do it again