I have a 5500 Black & Whit Double Jackpot. It has a DBV-200-sh Bill validator in it. $1.00 - $100.00. I turn the machine on and everything boots up normal. With door still open, I get the code 50, door open. When I close the door and the machine re-boots the validator will continue to cycle over and over, Will not stop. What could be the problem? Any help would be appreciated. Just a note that I'm a rookie when it comes to slots. Only got it a week ago. I finally got everything else working except for the validator.