Electronics Module - Xerox Phaser 8400 Service Manual

Electronics Module

The electronics module includes the main board, the power control board, and the
power supply. The electronics module is a field replaceable unit (FRU) assembly.
Main Board
The main board performs the image processing functions. Communication ports on
the board receive the print job image data and convert it to drive signals for the
printhead. The main board also contains the mechanical process controller, which
commands the function of the power control board. The main board sends signals to
the power control board, which are passed through to the wave amp board, which
amplifies the signal that drives the jets on the printhead. The main board supports
Non-Volatile RAM (NVRAM), memory, the hard drive, input/output ports, and the
configuration card.
NVRAM: The NVRAM memory device, located on the main board, stores front
panel defaults, network settings, calibration data, copy counts, usage profile data, and
the printer serial number, which is also referred to as the engine tracking number
(ETN). When the electronics module is replaced, the NVRAM must be transferred to
the main board in the replacement electronics module.
Memory:
The main board supports two PC 133 compatible SO-DIMM SDRAM
memory modules (128 to 256 MB).
Hard Drive Support:
A hard drive IDE cable is plugged into the main board from
the hard drive board. A separate power cable must be plugged into the power control
board from the hard drive board to make the hard drive board functional.
Input/Output Ports:
The main board provides support for Ethernet (not supported
on the B and BD printer model configurations), Parallel, and USB 2.0 external I/O
interfaces.
Configuration Card
The configuration card is a thumbnail-sized device that plugs into the side of the
electronics module. This device stores printer information and interacts with the
printer's NVRAM chip. The configuration card supports the transfer of printer model
and network configuration information from a failed printer to a replacement printer.
When the electronics module is replaced, the Configuration Card must be transferred
to the replacement electronics module.
Information stored on the configuration card includes the feature value, ethernet
address, and personality parameters. The printer model configuration is determined
by a combination of the feature value and other printer hardware capabilities. Printer
model configuration can be transferred from one printer to another printer by
migrating the configuration card between the printers. Feature value and ethernet
address are configured at the factory, and are "read only". The feature value is fixed in
2-4 Phaser 8400 Color Printer