09/2007
8-8
Phaser 8860/8860MFP Service Manual
Image Output Terminal
Initial Issue
Theory of Operation
Image Output Terminal
The Image Output Terminal (commonly referred to as the print engine) is made up of nine
major subsystems:
• The Process Drive
• The Media Path Drive
• The Ink Loader
• The Printhead
• The Drum Maintenance System
• The Preheat and Deskew System
• The Drum Assembly and Transfix System
• The Exit Module
• The Purge System
Except for the Exit, Electronic, and Ink Loader modules, the 8860 and 8860MFP use the same
print engine. Subsystem descriptions apply to both models.
NOTE: The Electronics Module is also a subsystem of the IOT but was discussed previously.
For more information on the Electronics Module, see Electronics Module.
Figure 1 IOT Subassemblies
IOT Subassembly Functions
Process Drive An open loop system that transmits torque to two main camshaft assem-
blies. One camshaft assembly controls the Transfix Roller loading, and
the other controls the drum maintenance system and Printhead tilt sys-
tem.
Media Drive The Media Drive assembly controls each roller in the media transport
system. The Media Drive assembly includes a drive motor, gearbox,
solenoid, and three clutches. The Media Drive motor also drives the
Wiper assembly and the headlock mechanism through a gear train and
solenoid on the Exit Module.
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