visible horizontal lines on print outs

[Vann3]

 I already tried "Quality Diagnostic Page - 3 tries" a couple of times (not continuous) but then the lines are still visible. So i tried cleaning the printhead (black and colored) but only the lines on the black printed disappeared. i want to try to fix it first before going to the support center since it's too far to travel. thank you

[Jerry_57 · Accepted solution]

Hi @Vann3,

Welcome to the HP Support Community.

Thank you for posting your query. I will be glad to help you.

I hear that if horizontal lines are still visible after multiple diagnostic/cleaning attempts and only the black print improves, the remaining issue is likely with the colour printhead/nozzles.
 

What to do next

Print the Image/Print Quality Diagnostic page again
 

• Check whether the color blocks/rectangles still show horizontal lines or missing dashes/white lines.
•  
• HP notes that if one color shows defects while others improve, the affected printhead likely still needs attention.
   

Clean the affected color printhead again
 

• HP recommends cleaning faulty printheads and then reprinting the diagnostic page.
   
• If the problem remains, clean the printheads again and retest.
   
• Since black improved, but color did not, focus on the color printhead.

If repeated cleaning does not fix the color lines
 

• HP says to consider manual cleaning of the printhead (if supported for your model), then test again.
   
• If the color printhead continues to show defects after repeated cleanings, replace the faulty printhead or contact HP Support.

Also, check these settings
 

• Make sure the paper type loaded matches the paper type selected in the printer/software.
   
• Use a higher print-quality setting.
   
• If available for your printer, run printhead alignment and paper advance/linefeed calibration, since HP says these can also cause horizontal line issues.

I hope this will help.
 

Take care and have a good day.