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Service Guide OJ2010
Chapter 2 Principles of Operation
2.1.09 System Board
The system board controls all printer functions not controlled by the computer.
U56 on the system board is the code module (EPROM). When replacing the system board, be sure to
remove the EPROM. Replacement boards are shipped without the EPROM.
Removing the system board resets the head to head and bi-directional printing alignments to factory
defaults. The end user performs these alignments through the User Software Utility. Refer to the Users
Guide for details.
Power to the system board is supplied by the power supply unit. The power to the other electrical parts is
distributed via the connectors on the system board.
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