HP 450c Service Manual - Page 188

EEROM EEROM is used as nonvolatile storage for calibration and configuration data. Useful information from the EEROM is printed on the service configuration plot. The EEROM is soldered to the Main PCA in both new and rebuilt electronic modules. If you clear the EEROM or replace the electronics module, perform all calibrations. Also note that the factory spittoon value on the cleared or new EEROM is 0%. Keep in mind that the value printed on the service configuration plot may greatly underestimate the amount of ink in the spittoon. Input/Output Interfaces The Printers have both a parallel (BiĆTronics) and a serial (RSĆ232ĆC) interface. Unlike the DesignJet 650C, they have no modular input/output (MIO). You can connect the Printers to a network by means of an HP JetDirect EX or HP JetDirect EX Plus3 external print server. BiĆTronics In addition to the operating modes of the DesignJet 220, the BiĆTronics interfaces feature the extendedĆcapabilityĆport (ECP) forward and reverse operating modes, providing for faster communication. RSĆ232ĆC The supported baudrates are 1200, 2400, 4800, 9600, 19200 and 38400, with eight bits and no parity, or seven bits with either odd or even parity. Mark parity is not supported. Both XON/XOFF and DTR handshaking are supported. ENQ/ACK handshake is not supported. Power Supply An autoĆranging power supply is located in the electronics module. WARNING The primary side of the power supply contains rectified line voltage that can be lethal when touched even if the ON/OFF switch is OFF. In any case, you should not need to open the electronics module. It is one exchangeable part. Water Condensation In humid environments, water may condense on the sideĆplates. A wick attached to the underside of the right sideĆplate routes water drops away from the mainĆPCA electronics. 10-8 HP DesignJet 430, 450C and 455CA Printers Functional Overview