Electronics Module
The electronics module includes the main PCA power supply and fan It is one exchangeable part; you do not need to open it If you replace the electronics module remember to swap any SIMMs from the old module to the new one
Sensors
There is no bail sensor for the P DesignJets 43 45C and 455CA There is a pinch8arm sensor which is different to the one installed on the P DesignJets 33 and 35C The following sensors connect to the main PCA
The coer sensor is a mechanical switch that detects if the Printer cover has been raised If you open the cover while the Printer is plotting the plot is cancelled!
The media sensor detects the presence of media It is also used to determine media length
The line sensor sends signals to the carriage and is used to detect the mark encoder and read alignment patterns It is also used to determine media width
The pincharm sensor detects whether the pinch8arms have been raised The servo processor uses the sensor to determine the pinch8arm position during the initialization sequence
OM
The Printer firmware code is contained on either an in8built masked ROM
soldered to the main PCA or a flash ROM SIMM installed in the inner8most socket at the back of the Printer If both are present the Printer recognizes the code on the ROM SIMM instead of that on the in8built ROM The power8on LED sequence tells you whether the Printer is using code from in8built ROM or from a ROM SIMM If the LEDs begin to light up from the right then the Printer is using the ROM SIMM If the LEDs begin to light up from the left then the Printer is using the built8in ROM To find out the firmware8code revision level that the Printer is using print a user setup sheet or a service configuration plot
AM
The Printers have a standard four megabytes of on8board RAM They also have one RAM8expansion socket which can hold an optional 48 8 68 or 328 megabyte DRAM SIMM The socket is the outer8most one at the back of the Printer
Functional Overview | HP DesignJet 430, 450C and 455CA Printers |