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4-26 Service Tests
HP DesignJet 430, 450C and 455CA Printers
Service Monitor (Data Display)
The service monitor is useful to find out why the Printer is not plotting what
you expect it to plot. It enables you to read the graphicsĆlanguage
instructions that the Printer is receiving from the computer. Instead of
plotting the drawing that you send, the Printer prints the beginning and end
of the code that would otherwise have been used to plot the drawing.
You need a basic knowledge of the graphicsĆlanguage instructions to be able
to pick out the important information from the printed code.
Perform the Service Monitor as follows:
1 In service mode 2, load a sheet of media (A3 size or B size minimum)
in portrait orientation.
2 Press Service Monitor (Media Type and Media Source Keys).
3 Send the file from the computer through the serial or parallel ports.
The Ready LED begins to flash.
4 Wait until the computer has indicated that it has sent the file.
The Ready LED continues to flash.
5 While the
Ready LED is flashing, press Service Monitor (Media Type
and Media Source Keys) again.
The Ready LED continues to flash. After a minute, the fan turns on,
and the carriage moves to the right side of the Printer.
Instead of printing the drawing that you sent, the Printer prints the first
and last Kbytes of the code for that drawing. The code is printed in
hexadecimal and ASCII format. (If the total size of the file(s) sent is not
bigger than one Kbyte, only the first buffer is printed.) The Printer exits the
service monitor mode if the file(s) sent contain PJL universal exit language.