JCM Part No . 960 - 000076R _ Rev . 1 © 2007, JCM - American Corporation 2 - 2 Section 2 World Bill Acceptor (WBA® - 1x/2x - SS & SS2) Installation/Operation 3 . To install the new bill guides, push the guides back into the Acceptor Head slot from the front until you hear a click ( See Figure 2 - 4) . Be sure to push the guides into the assembly in the correct direction . Input/Output Circuits 1 . Figure 2 - 5 and Figure 2 - 6 illustrate the various WBA Input/Output Circuit Diagrams .     Figure 2 - 3 Removing Old Bill Guides Figure 2 - 4 Installing New Bill Guides Figure 2 - 5 WBA 12, 13, 22 & 23 Input/Output Circuit Diagram Figure 2 - 6 WBA 10, 11, 20 & 21 Input/Output Circuit Diagram