ok. thx. what is in your opinion to do it? is it joining the two grounds cables enough?no problem, but you must tie the grounds together or at least ensure that the ground on the JVS port makes a solid connection on the NAOMI main board.
So expanding from that, will it work if the common ground/reference point is at the power distribution block? Given that the power distribution block is situated right after AC Line-in and between the Standard Arcade Switching PSU?they just need to have a common reference point for the logic/communication to work properly.
Technically speaking the ground wire on the the JVS (usb) cable should make the ground link between the game PCB and the I/O PCB. In my experience however this connection is sometimes flakey which is why I recommended using a meter to test that there is good ground connectivity before relying on this.I've already used 2 different PSU, with no link. Cabinet PSU for I/O and sound amp and another PSU for mainboard, and no problem