2-4 Phaser 8400/8500/8550 Color PrinterProcess DriveThe process drive is an open loop system that transmits torque to two main camshaftassemblies. One camshaft assembly controls the transfix roller loading, and the othercontrols the drum maintenance system and printhead tilt system. A small DCservomotor powers the process drive gearbox to rotate the gears to specific positionsduring the printing process. The process drive is able to actuate each camshaft systemindependently through the use of the swing arm in the gear train.The rotational direction of the motor controls the operation of the transfix and drummaintenance system. When the process motor rotates in one direction, the swing gearengages the lower gears. When the motor rotates in the opposite direction, the uppergears are engaged.Since the system is open loop, special attention to the home position of the processdrive gears and the mating camshaft gears is critical. The process drive gearbox ismechanically keyed upon installation via gear orientations. These gear orientationsallow the printer subsystems to self-home during operation. If either the gearbox orcam gears is out of home during installation, the printer does not function properly.s8500-009Process drive Swing gearProcessMotorGearProcessMotor GearTransfixCamshaftImaging TransfixDrum MaintenanceDrumMaintenanceCamshaft
