The Sinclair QL Forum

Looks good to me. I've ordered some PCBs, will report back here when one is made and tested.

Finally made and tested. It doesn't work, then I checked and even removed the LS00 socket from the real one just to make sure. The traces under it aren't right. Here is a pic of a real one (top) and your reproduction.
The trace that goes all the way from 2B on the edge connector, up the side then across should go to pin 5 on the LS00 (not pin 9). The 2 connections under the LS00 should also be removed. I bodged one by cutting 3 traces and exposing the copper on the connection to B2 and then adding a thin jumper wire to pin 5 of the LS00. That worked and is not visible as the changes were under the LS00 so not a big deal.

Thank You so much to do the effort of desoldering the Original Cartridge and checking the tracks.

This has more sense of what I do in the PCB.

I already change the PCB in the github, to match the information you provided, thanks, hopefully this time will be OK.