HP Designjet T Series — Service Manual 1-22
Print quality troubleshooting
The results are seperated onto two screens. Use the Arrow keys to display
the second results screen.
Any printhead with a test result containing a number that is not within the ±3
dot row range is misaligned.
The mK printhead is used as a reference to test the other printheads. If all
the printheads fail the Pen to Pen tests, it is the mK printhead that is
misaligned.
Reading the Printhead Alignment Diagnostic Print
The following plot shows correct printhead alignment for all patterns. The
clear band is in the center of the pattern.
The following plot shows bad printhead alignment. The clear band is not in
the center of the pattern.
Corrective Action
If any of the printheads are misaligned beyond the ±3 dot row range,
perform a Printhead Alignment. See
Aligning Printheads on page 1-48.
If a Printhead Alignment does not correct the problem, replace the bad
printhead.
If the customer is using non-HP media and after the Image Quality Test you
still have the same image quality problems, change to genuine HP media
and repeat the Image Quality Test. The best alignment calibration is
obtained using HP Photo Paper.
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