HP Designjet 5100 Printer series - Manual (Page 87)

6-5
Troubleshooting image quality
HP Designjet 5100 printer Customer Reference Guide
printer that has a media advance problem. Note: The bands appear light
because the roller has advanced too much. The opposite could also be true,
the bands could appear dark because the roller has not advanced
sufficiently.
In high quality modes, due to the amount of ink used, media advance
problems may not appear as lines of banding, they may appear grainy
instead. The banding or graininess will appear in all the colors.
Corrective action
1 If the image is grainy, this could also be a symptom of problems with the
bidirectional alignment. Refer to Plot 3: bidirectional alignment, on page 5 . If
this pattern is ok, go to step two.
2 Perform the Accuracy calibration, on page 8 with the same printing material
with which you were experiencing unacceptable image quality.
3 If there is no improvement in print quality, contact your support
representative.
NOTE: It is also possible that this kind of banding was caused because you
were using a printing material not supported by HP. Performance can be
guaranteed only if you use supported HP materials.
Plot 2: color to color alignment
If the printer has color-to-color alignment problems then the Image Quality
Print in plot 2 (shown below) has misaligned colors.
Corrective action
1 Perform the Aligning the printheads, on page 9 with the same printing
material with which you were experiencing unacceptable image quality.
2 If there is no improvement in print quality, contact your support
representative.
Plot 3: bidirectional alignment
If a printer has bidirectional alignment problems, lines are fuzzy or not
straight. The pattern seen below is designed to highlight this kind of
problem. Check the lines on this test pattern; if they have any defects like the