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10-8 Functional Overview
HP DesignJet 430, 450C and 455CA Printers
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.
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.
WARNING
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.