Well, I swapped out the reset IC and left the machine running for some hours. No dice

I still have no idea how to test for ripples without an oscilloscope. I'm considering replacing the reset switch with a new one that's open by default to avoid the issue altogether.

Hi,

I'm trying to repair a PSU from a SCPH-7502 unit and I'm looking for some helpful advice.

The PSU has this design:
https://i.imgur.com/kZdVx36.png

The problem is that the console randomly resets at various points during gameplay. I've confirmed (by testing with spares) that the problem is ...