latigid on Thanks a lot for the suggestions! I appreciate it.
It is version 1.3. Just realised I built the modules with 10 pin eurorack headers, so i will need to fix that to take advantage of my 5v PSU line. But the module should still work with the onboard reg, so for now am leaving the header selecting Vreg.
I have probed D1 and get 12v one side and a bit less on the other side. Getting 5v on Vreg the jumper pin. So I’m guessing that means the onboard 5v reg is all good?
Ribbon cables look fine, correct polarity. Will probe them later to make sure. As far as the line transmit module, I remember installing it as I was looking forward to using the CV expansion. But the D1-D3 outputs shouldn’t be lighting up when the D25 cable is not connected? That is what is happening.