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HP Designjet T Series — Service Manual 1-14
Print quality troubleshooting
Banding
If the Printer is experiencing a banding problem, you will see repetitive
horizontal bands within the printed image.
Darker horizontal bands or lines repeated along the vertical band (from
top to bottom at the same distance).
Whiter horizontal bands or lines along the vertical band (from top to
bottom at the same distance).
The plot is printed in Best or Normal mode (according to the menu option
selec
ted) with Error Hiding ON. The top band has 100% ink density patches
while the bottom band has 50% ink density patches.
Troubleshooting Banding Problems
If banding does N
OT occur in ALL the colors, then it is more than likely a
Printhead problem. In this case, try the following:
1
Check that the appropriate print quality settings are being used (refer to the
User’s Guide for more information)
.
2 Recover the printheads using the option through the Front Panel (Main
Menu/Image Quality Maintenance/Clean Printheads). Reprint the
Diagnostic Print or the print file and if the problem persists, replace the faulty
Printhead.
If banding does oc
cur in ALL the colors, then it is more than likely a Paper
Advance problem:
If the bands are light, it means that the paper has advanced too much.
If the bands are dark, it means that the paper hasn’t advanced enough.