Hello, I'm fixing up a SEGA Model 3 harness that had missing power lines, the way that the harness was given to me, one of the power connectors (CN14) had no +5v wires, however had a couple grounds connected to the Jamma edge. As you can see in the diagram I have grounded the main power connector (CN13) to the power supply entirely, including the grounds, 3.3v, 5v (it is an ATX power supply and is the only thing that is powering the board, Jamma edge is simply for interfacing the controls/video). Is it safe for me to connect the missing 5v on CN14 from the power supply, while grounding it at the Jamma edge? Or do I need to ground at the power supply like the other grounds. Thanks!
- Thread starter Bashi
- Start date
Grounds for CN13 and CN14 are connected on the motherboard side, so yes, you could to this, however, it's not good practice.
Personally, I would wire one or two grounds from both connectors to the jamma edge, and everything else to the PSU.
