I have a sony dxc 325 with a betacam sp bvv 5 docked to the back. It seems when I am not running the tape in the bvv-5 the picture from the camera's bnc video out goes blank and only dark shadows appear. When I run the tape on the bvv-5 (record, play, rew, ff, and eject) the picture appears and is viewable, but only when the tape is moving. I dont know if this is a problem or a setting I have overlooked. I have already tried docking a svhs unit and it dosn't have this problem. So I think it might be caused by the bvv-5. Please help.