Reading voltage off of a PCB?

Probably a newbie question... I just got a Sigma up and running, I'm wondering what contacts I need to use to get a voltage reading so I can fine tune the boards I am running to system specs.

Hyper64 with Pro controllers = thank goodness!!!

Take a voltmeter; set it to a voltage range. Set the black lead to pin 1 or 2 at the edge, then the red goes to 3 or 4 which has red wires. You should be reading 5.00 volts or so. Adjust the power supply to reach that reading.

Thanks, didn't get around to trying that until now. I had the right idea but I was holding the lead to a soldered point on the 5V wire instead of the pin itself.