HP LaserJet 4v/mv Service Manual - Page 69

DC Controller System The following systems and functions are controlled by the DC Controller: • DC Power Distribution • Laser and Scanner Drive • Paper Motion Monitoring and Control • Clutches, (Registration, Cassette Pickup, and MP Tray Pickup) • Engine Test Microswitch • Motors (Main Drive, Scanner, and Fans) Figure 5-2 shows the Power Supply and Distribution System. Refer to the wiring diagrams at the end of Chapter 7 for detailed listings of the DC Controller inputs and outputs. DC Power Distribution The DC power distribution circuitry, located on the DC Controller PCA, distributes +5 V dc, +12 V dc, and +24 V DC as follows: +5 V dc: Control Panel Formatter PCA Photosensors (PS401, PS402) DC Controller Circuitry Laser/Scanner Assembly Exhaust Fans, FM1 and FM2 (low speed) Intake Fan, FM3 +12 V dc: Laser/Scanner Assembly +24 V dc: Laser/Scanner Assembly High Voltage Power Supply Clutches and Solenoids Exhaust Fans, FM1 and FM2 (high speed) Functional 5 Overview Functional Overview 5-7