JCM Part No . 960 - 000053R _ Rev . 6 © 2007, JCM American, Corporation 1 - 7 General Information AD - 02™ Retrievable Bill Validator Section 1 Base Stacker Unit Assembly Base Unit Assembly Figure 1 - 11 AD - 02 Bill Acceptor Standard Stacker Units 1 & 2 Assembly The Base Stacker Unit stores and dispenses bills (notes) and contains the drive motor for the Intra - Chamber Bill Transfer Unit . Figure 1 - 12 AD - 02 Bill Acceptor Base Unit Assembly The Base Unit contains a roller assembly that allows the unit to be extended forward from its mounting position for service access to the Bill Transfer Unit .