HP Color LaserJet CM4730 Service Manual - Page 237

Output devices This section describes the theory of operation for these components: ● IPTU ● 3-bin mailbox system ● Stapler/stacker system IPTU The IPTU (intermediate paper transfer unit) is installed at the face-down delivery area of the MFP. Its function is to transfer paper to the installed output device, such as the stapler/stacker and the 3-bin mailbox. The standard face-down tray should be removed when installing the IPTU. Paper flow is illustrated in Figure 4-56 IPTU paper path on page 217. To delivery options Figure 4-56 IPTU paper path The IPTU is controlled by the intermediate paper transfer driver PCB (IPTD PCB). The IPTD PCB controls the IPTU sequencing and communicates with the DC controller. The DC controller sends commands to the IPTD PCB at appropriate points in the printing process and the IPTD PCB drives motors in response to these commands. The IPTD PCB submits status information to the DC controller. The MFP supplies +24VDC to the IPTU. The +3.3V for IC is generated by +24V in the IPTD PCB. Figure 4-57 IPTU PCB flow on page 218 shows the signal flow in the IPTD PCB. ENWW Output devices 217