HP Designjet 2800/3800cp Service Manual - Page 152
Banding Caused by Media Advance Problems, Banding Problem 4
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Banding Problem 3: Banding in yellow, red and green columns only, but more evident in yellow than in red and green columns. Problem Description: This is an indication that the yellow printhead may require servicing or could be damaged. Corrective Action: Refer to Test Pattern 3 ' page 6-13 to troubleshoot the Yellow Color. Banding Problem 4: Banding in black column only. Problem Description: This is an indication that the black printhead may require servicing or could be damaged. Corrective Action: Refer to Test Pattern 3 ' page 6-13 to troubleshoot the Black Color. 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: Banding in all color columns (see Example B). Problem Description: The causes are not related to misalignment but the troubleshooting actions are the same. Corrective Action: Refer to Test Pattern 4 ' page 6-14 to troubleshoot the problem. 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 HP DesignJet CP Series Printers Image Quality