Sega Saturn schematic?

Does any one have or know where I can get a schematic for a Sega
Saturn? I have one that comes on (the green power LED comes on), but I
don't get any A/V output, the motor doesn't so much as twitch and the
laser assembly doesn't come on. On the power supply output pins, I am
getting 5v on the line marked 5v, but I am also getting 5v on the line
marked 3a. In my experience with most game systems (and electronics in
general), computers usually need a 5v line and a 12v line. I am
guessing that the line marked 3a is supposed to indicate 12 volts at 3
amps. I could be wrong (it's happened before!). That's why I need a
schematic.

If anyone can help, you can either respond here or (preferably) to my
email address ShelbyTV RemoveThis @bellsouth.NOSPAM.net

Of course, it goes without saying that you will need to remove the
..NOSPAM in the email address above.

I will really appreciate any help or advise that you can offer. I'd
like to get this going to add to my game console collection.

---
Derek Tombrello
Shelby TV Service

Systems I Own: Atari 2600, Atari 5200, Nintendo, Super Nintendo,
Nintendo 64, PlayStation, PlayStation 2, Sega Saturn (hopefully -
hint, hint), Sega Dreamcast, GameBoy, GameBoy Color, Xbox, Sega
Genesis... and always looking for more!