Two common UV printer problems are horizontal banding and large color differences.
For example, you may print a solid blue background and notice thin horizontal lines across the image. Or the red in your artwork may look orange after printing.
These two problems often come from the printhead condition, step calibration, image format, or software settings.
Horizontal Lines Across the Print
Horizontal lines usually appear as light or dark bands running across the image.
Check the Printhead
Print a nozzle test.
If some lines are missing, broken, or angled, the nozzles may be clogged or firing in the wrong direction.
Run the normal cleaning cycle and print another test.
If the nozzle pattern returns to normal, run a small sample print before starting production again.
Regular Printer Troubleshooting can help catch nozzle problems before they ruin a full-size job.
Check the Step Calibration
Banding can also happen when the media feed or step value is incorrect.
Open the maintenance settings in your printing software and run the step calibration.
If the step is too large, you may see white gaps between passes.
If it is too small, the passes may overlap and create dark bands.
Make small changes and test again until the lines disappear.
Large Color Differences
Sometimes the print is sharp, but the colors look very different from the original file.
Check the Image Format
Use CMYK mode when your workflow requires CMYK files.
Saving the artwork as a TIFF file can also help keep the image data stable during RIP processing.
If a customer sends you an RGB image, convert it carefully before printing and check the color again.
Run a Nozzle Test
A clogged nozzle can also change the final color.
For example, if some cyan nozzles are missing, a blue area may look more purple than expected.
Print a nozzle test and clean the Printer Printhead if you see missing lines.
Check the Software Settings
Incorrect RIP settings can cause major color shifts.
Check the:
- Ink configuration
- ICC profile
- Resolution
- Pass setting
- Ink limit
- Color mode
Use the standard settings recommended for your printer, ink, and material.
Quick Check
If you see horizontal bands, check the nozzle test and step calibration.
If you see large color shifts, check the image mode, nozzle condition, and RIP settings.
A small test print can save a lot of ink and material before you start a full production job.