I recently got this Pac-Man board, supposedly in working condition, but I'm not familiar with this PCB.
I see that the board originally uses a 7V AC transformer, but I've read that it can be powered with 5V DC through an adapter and connected to a JAMMA harness.
So, I built the adapter and connected the board, but I'm only getting a black screen.
When measuring any 74xx chip, I'm only getting 2V instead of 5V.
The power supply is set to maximum, and it measures 6.2V at the edge connector. I also ran 2 (5V + GND) extra thick wires from the PSU to the edge connector.
Is this PSU not sufficient, or am I doing something wrong?
I've attached pictures of the PSU and the adapter.
Thanks in advance.


I see that the board originally uses a 7V AC transformer, but I've read that it can be powered with 5V DC through an adapter and connected to a JAMMA harness.
So, I built the adapter and connected the board, but I'm only getting a black screen.
When measuring any 74xx chip, I'm only getting 2V instead of 5V.
The power supply is set to maximum, and it measures 6.2V at the edge connector. I also ran 2 (5V + GND) extra thick wires from the PSU to the edge connector.
Is this PSU not sufficient, or am I doing something wrong?
I've attached pictures of the PSU and the adapter.
Thanks in advance.






