JCM Part No . 960 - 000053R _ Rev . 6 © 2007, JCM American, Corporation 1 - 6 Section 1 AD - 02™ Retrievable Bill Validator General Information Expander Stacker Unit Assembly Standard Stacker Unit   Assembly Figure 1 - 9 AD - 02 Bill Acceptor Expander Stacker Unit Assembly The Expander Stacker Unit increases the size of the Standard Stacker Unit . Figure 1 - 10 AD - 02 Bill Acceptor Standard Stacker Unit Assembly The Expanded Stacker Unit stores and dispenses bills (notes) .