HP DesignJet 2500CP Service Manual page 146

Banding Problem 3:
Problem Description: This is an indication that the yellow printhead may
Corrective Action:
Banding Problem 4:
Problem Description: This is an indication that the black printhead may
Corrective Action:
Banding Caused by Media Advance Problems
Another type of banding is caused by an inaccurate media advance. The printer
prints an image by `bands' or `swaths' which are fixed widths depending on the
advance of the media roller. If the advance of the roller differs from the
theoretical advance, there will be banding (horizontal repetitive bands along
Test Pattern 2) in all the primary and secondary color columns.
The bands can appear as dark bands, due to a shorter advance of the roller which
causes an overlap, or lighter bands due to a longer advance causing spaces.
Banding Problem:
Problem Description: The causes are not related to misalignment but the
Corrective Action:
It is also possible that the banding was caused because the customer
was using non HP media. The performance of the printer can only be
guaranteed if genuine HP media is used.
6-10
Banding in yellow, red and green columns only, but
more evident in yellow than in red and green
columns.
require servicing or could be damaged.
Refer to Test Pattern 3 ' page 6 13 to
troubleshoot the Yellow Color.
Banding in black column only.
require servicing or could be damaged.
Refer to Test Pattern 3 ' page 6 13 to
troubleshoot the Black Color.
Banding in all color columns (see Example B).
troubleshooting actions are the same.
Refer to Test Pattern 4 ' page 6 14 to
troubleshoot the problem.
HP DesignJet CP Series Printers Image Quality