HP Mopier 320 Service Manual - Page 170

DC Controller System Note The following systems and functions are controlled by the DC Controller PCA: DC Power Distribution (+3.3V DC, +5V DC, +24V DC) Laser and Scanner Drive Paper Motion Monitoring and Control (photosensors and flags) Clutches (registration, tray pickup, and Tray 1 feed) Engine Test Motors (Main Drive, Scanner, and Fans) Figure 5-2 on page 131 shows the Low Voltage Power Supply and Distribution System. See the wiring diagrams at the end of Chapter 7 for detailed listings of the DC Controller inputs and outputs. Laser and Scanner Drive Based on information received from the Formatter, the DC Controller sends signals to the Laser/Scanner Assembly to modulate the laser diode on and off and to drive the Laser/Scanner motor. See "Image Formation System" later in this chapter for more information. Paper Motion Monitoring and Control The DC Controller PCA controls paper motion by continuously monitoring the various paper sensors and coordinating paper movement with the other print processes. Clutches The DC Controller PCA provides drive signals for the Registration Assembly Clutch (CL1), Paper Input Unit Clutch (CL2), and the Tray 1 Feed Clutch. The External Paper Handling PCA mounted on the Formatter Assembly provides the control signals for the clutches in the 2000-sheet Input Tray, 8-bin Mailbox/5-bin Mailbox with Stapler, 2 x 500-sheet Input Tray, and 7-bin Tabletop Mailbox. Refer to figure 5-2 for details. C4229-90911 DC Controller System 137