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HP DesignJet 5000 Series Printers Service Manual
Nozzle Print Test
NOTE If your Printer has nozzle defects, it does not mean that you will
not get perfect print quality results. The Printer has automatic
procedures to hide many nozzle defects. This type of problem
affects print quality mostly in Productivity and Max. Speed
modes.
The nozzle print test is number 5 in the Diagnostic Print. In this test
the 512 nozzles that each Printhead uses to print with are tested.
Each nozzle on each Printhead prints a series of very close lines that
can be seen as small squares in the Diagnostic Print. You can see
whether a nozzle is not working if squares are missing or if a nozzle
is malfunctioning, the color fill is less dense.
If you have more than 30 defective nozzles, the Printer will
automatically request you to recover the Printhead(s)
((XX20)RECOVER), or to replace the Printhead(s) ((XX21)REPLACE)
if the defect cannot be recovered.
This test also allows you to check the condition of the Printhead if
your Printer displays a (xxxx)REPLACE or (XXXX)RECOVER
message for a Printhead that has recently been changed or recovered
successfully. If there are not a large number of squares missing, and
so the nozzles are firing correctly, you may have a drop detector
problem.
Nozzle Test for Cyan Printhead
Missing Squares
5