Archived from groups: rec.games.video.arcade.collecting (More info?
"Larry" <firstname.lastname@example.org> wrote in message
> i have a centipede pcb that will not sync. monitor is 100% and all the
> are correct on the power supply and everything checks out fine so i know
> the board. any suggestions where to start would be great
If you're trying to use negative-going composite sync, as most games do, I'd
say the problem is a bad 7407 TTL chip located at A9. I've run into that
But if you're using positive-going vertical sync and horizontal sync, those
are provided on the board, too. Those come from a 7407 at location A/B10.
That should take care of your problem.
Matt J. McCullar