2-4 Phaser 8400 Color PrinterElectronics ModuleThe electronics module includes the main board, the power control board, and thepower supply. The electronics module is a field replaceable unit (FRU) assembly.Main BoardThe main board performs the image processing functions. Communication ports onthe board receive the print job image data and convert it to drive signals for theprinthead. The main board also contains the mechanical process controller, whichcommands the function of the power control board. The main board sends signals tothe power control board, which are passed through to the wave amp board, whichamplifies the signal that drives the jets on the printhead. The main board supportsNon-Volatile RAM (NVRAM), memory, the hard drive, input/output ports, and theconfiguration card.NVRAM: The NVRAM memory device, located on the main board, stores frontpanel defaults, network settings, calibration data, copy counts, usage profile data, andthe 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 tothe main board in the replacement electronics module.Memory: The main board supports two PC 133 compatible SO-DIMM SDRAMmemory modules (128 to 256 MB).Hard Drive Support: A hard drive IDE cable is plugged into the main board fromthe hard drive board. A separate power cable must be plugged into the power controlboard from the hard drive board to make the hard drive board functional.Input/Output Ports: The main board provides support for Ethernet (not supportedon the B and BD printer model configurations), Parallel, and USB 2.0 external I/Ointerfaces.Configuration CardThe configuration card is a thumbnail-sized device that plugs into the side of theelectronics module. This device stores printer information and interacts with theprinter's NVRAM chip. The configuration card supports the transfer of printer modeland network configuration information from a failed printer to a replacement printer.When the electronics module is replaced, the Configuration Card must be transferredto the replacement electronics module.Information stored on the configuration card includes the feature value, ethernetaddress, and personality parameters. The printer model configuration is determinedby a combination of the feature value and other printer hardware capabilities. Printermodel configuration can be transferred from one printer to another printer bymigrating the configuration card between the printers. Feature value and ethernetaddress are configured at the factory, and are “read only”. The feature value is fixed in
