printed pages show repeated horizontal/vertical lines, gaps or streaks
Visible steps in a smooth gradient can come from content bit depth, GPU/output settings, compression, calibration or the panel itself.
Do not jump to the most invasive fix
Do not diagnose the panel from a compressed screenshot or video; use a locally rendered reference pattern first.
Retest the same condition
Compare the same local gradient after changing only one link in the display path.
Rule out the simple causes
- 1
Print DeviceOK Fine Line and Color reference pages.
- 2
Confirm the correct paper/media type and print-quality setting.
- 3
Use the manufacturer diagnostic/maintenance tool for nozzle/head cleaning or alignment when applicable.
Work through the problem in order
- 1
If banding appears on DeviceOK references and other documents, it is not document-specific.
- 2
Follow the exact model's official head/nozzle/alignment procedure rather than repeated random clean cycles.
- 3
If the pattern persists after supported maintenance and correct consumables/media, move to model-specific service guidance.
A clean DeviceOK reference suggests the original file/app/driver settings may be involved.
Repeatable lines on controlled references justify printer maintenance/model-specific troubleshooting.