Power system on ECU The AC, DC, and high-voltage power supply circuits are all contained within the ECU. AC power distribution The AC power circuitry supplies AC voltage whenever the power cord is connected to the AC power source. AC voltage is distributed to the DC power supply circuitry and to the AC driver circuitry, which controls AC voltage to the fuser assembly heating element. DC power distribution The DC power distribution circuitry, located on the ECU, distributes +3.3 Vdc, +5 Vdc, +24 Vdc, and +32 Vdc as follows: +3.3 Vdc: Formatter Laser/beam detect circuitry ECU Photo sensors ADF sensors Control Panel +5 Vdc: Formatter ECU Laser/beam detect circuitry +24 Vdc:
Printer paper path motor Exhaust fan Laser/scanner motor Solenoid Formatter (routing only) High-voltage power supply Fuser safety circuit CCD +32 Vdc: ADF motor Scanner motor Formatter (routing only) 88 Chapter 4 - Operational overview EN