Xerox Phaser 8400 Service Manual page 32

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Ink Loader
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Purge System
The Electronics Module includes the main board, the power control board, and the
power supply. An important component of the Electronics Module is the
Configuration Card. Printer model configuration is determined by a combination of
the Configuration Card feature value and other printer hardware capabilities.
The Process Drive is an open loop system that 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 gearbox and motor assembly controls each roller in the paper transport
system.
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 Ink Loader melts the solid ink as ink is required by the
Printhead. The melted ink drips into the ink reservoirs of the Printhead underneath the
Ink Loader.
The Printhead provides the ink used by each print job. Using its 1236 jet nozzles, the
Printhead can print the entire image on the rotating drum. The Drum Assembly and
Transfix System form the key portion of the printer where imaging takes place. The
image to be printed on paper is first "printed" on the rotating drum. A sheet of heated
paper or transparency film is then passed between the drum and the Transfix Roller.
Under the pressure between the drum and the Transfix Roller, the image is transferred
to the sheet of paper. The Purge System uses air pressure and a wiper blade to remove
any debris or air bubbles that may be obstructing the Printhead nozzles.
Theory of Operation 2-3