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Cgood call CN if you drop out the -5v it would lose video and go into "diagnostic" maybe there is a capacitor that is not holding I have a schematic of the boards. I'll try to find it and trace it out.

ARGH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!+1 . I got all new caps, some slightly larger since the exact size wasn't available, and I figured it'd help with the ripple... well, still same ripple . I've got ~75mV on the 12V line, ~45mV on the -5V line, but almost nothing on the +5V line. Any ideas what else besides caps could cause this? I swapped the rectifier diodes from another because I thought maybe they were old and letting some of the negative voltage through, pulling down the voltage, but that didn't make a difference (unless the other diodes were bad, but I've never heard that being a problem w/ these boards, so I doubt it).

Midway Space Invaders Switching Power Supply Conversion Kit It's an (almost) Plug and Play kit that replaces the original power regulator board (especially useful if your old one has dried out capacitors).  The hardest part of the whole installation is stripping the ends of two wires.  The kit includes an already assembled, fully labeled adapter harness and the parts required to connect and securely mount a switching supply in your cabinet.  The kit does not include a switching supply - those can be found in several places on the 'net for a lower price than we can sell them for.  Price: $35