Xerox Phaser 8400 Service Manual page 31

The Process Drive:
is Transmits torque to two main camshaft assemblies. One
camshaft assembly controls the transfix roller loading, and the other controls the drum
maintenance system and printhead tilt system.
The Media Path Drive:
Controls each roller in the paper transport system. The
paper transport system consists of a drive motor, a gearbox assembly and three
solenoids. The media path drive motor also controls the movement of the wiper
assembly and the headlock mechanism through a gear train and solenoid on the exit
module.
The Ink Loader:
Melts the solid ink as ink is required by the printhead. The melted
ink drops into the ink reservoirs of the printhead underneath the ink loader.
The Printhead:
Interfaces with the electronics of the printer to jet ink onto the
drum surface to create an image. The print head includes 1236 interleaved jets (309 of
each primary color) to provide the ability to electronically turn off a weak or missing
jet to restore image quality.
The Drum Maintenance System: Creates a thin intermediate liquid transfer
surface, a layer of silicone oil, on the surface of the drum prior to printing. The oil
keeps the ink from sticking to the drum's surface and facilitates its transfer to the
sheet of paper or transparency film.
The Purge System: Uses air pressure and a wiper blade to remove any debris or
air bubbles that may be obstructing the printhead nozzles.
The Drum Assembly and Transfix System: Form the key portion of where
imaging takes place. The image is first printed as a "mirror" image on the rotating
drum. A sheet of warmed media feeds from the preheater and passes between the
drum and the transfix roller. The process gear train then loads the transfix system and
presses the paper to the drum to adhere the image as the drum spins in the transfix
direction.
The Electronics Subsystem: includes the Electronics Module (also known as the
E-can); which contains the main board, the image processor board, the power control
board, and the power supply board. Distributed in the print engine are: the Wave
Amplifier board, Input/Output board, and Drum Heater Relay board.
Theory of Operation 2-3