L7680 Horizontal white lines through black/gray only

HP OfficeJet Pro L7680, Windows 7
Getting white horizontal lines through black or gray text and graphics.
The Print Quality Diagnostics Page results are:
Test pattern 1 looks fine
Test pattern 2 has white horizontal lines on the black and gray blocks. The color blocks look fine.
Test pattern 3 has white horizontal lines spaced 0.87 inches apart. They do not line up with the arrows.
I have run the Align Printer, Clean Printhead (three times) and Calibrate Linefeed functions and the problem still remains the same.
This particular case doesn't seem to be covered in the "Fixing Print Quality Problems for the HP Officejet Pro L7500, L7600, and L7700 All-in-One Printer Series" page at
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01957673&cc=us&dlc=en&lc=en
This question was solved.
View Solution.

Hi @Gerald22 ,
I see that you are having issues with the horizontal lines printing through the black. I can help you today.
Thanks for providing all the troubleshooting steps you have already tried. The cleanings, I believe that you meant you ran them through the printer settings.
I have provided a document for manually cleaning the contacts and one for manually cleaning the printheads to see if that helps. Please disregard the titles.
A 'Cartridge Problem,' 'Ink Cartridge Failure,' or 'Incompatible Ink Cartridges' Error Message Displ...
'The Following Printhead has a problem' or 'The following printheads are missing or damaged, replace...
Are you using Genuine HP Cartridges?
What are the ink levels?
Please call our technical support if the issue persists, at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. Contact HP.
Thank You.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
Gemini02
I work on behalf of HP

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L7680 Horizontal white lines through black/gray only

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