Canon imagePROGRAF Pro 4100s - Small black lines appearing randomly in the print head movement direction

[unique-posters]

I'm experiencing small black lines appearing randomly on prints from my Canon imagePROGRAF Pro 4100s, aligned in the same direction as the print head movement. We've tried the following troubleshooting steps:

• Cleaned the print head (standard cleaning only)
• Printed the nozzle control pattern - looks fine, except there are occasional minor, almost unnoticeable issues where black ink is printed.

Please see the attached screenshots of the issue. I hope you can help identify what might be causing this.

 

[DYP]

Looks like a fuzzy or something under your print head carriage. Have you tried cleaning the bottom of the carriage?

 

[TJPrinter]

I think it's caused by ink under the head too. If after cleaning under the carriage you still get the same marks make sure that the head isn't too close to the paper, either select a different paper type or go into your media configuration tool and adjust the head height.