That's an HDV deck (I think) so you need to go into the menus and make sure it's set up to play out DVCam over firewire. With deck NOT connected, go to "HDV/DV out" and make your selection, then "Video out", then "iLink set".
Then with the deck and computer off, connect the firewire cable, turn the deck on, then turn the computer on and launch FCP. See if that works, you may have to poke around with your device control pre-sets as well.