printer is printing black lines through printed paper

[aperduk]

When I go to print something, it prints whatever with all these black lines through it.

[A_Gayathri]

Hi @aperduk,

Welcome to The HP Support Community.  

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

I understand the issue you're experiencing with your HP OfficeJet Pro 6978 printing black lines could be due to several factors, such as dirty printheads, clogged nozzles, or ink cartridge problems. Here’s a step-by-step guide to troubleshooting and resolving this issue:
 

1. Clean the Printhead

• You can use the printer’s internal tools to clean the printhead and fix any nozzle blockages:
  1. On the printer's control panel, swipe left and tap Setup.
  2. Select Printer Maintenance or Tools.
  3. Choose Clean Printhead.
  4. The printer will start the cleaning process, which may take a few minutes. You may need to run this process more than once for a thorough cleaning.

2. Check Ink Levels

• Make sure your ink cartridges are not running low on ink, especially the black one:
  1. Open the HP Smart app or the printer's control panel.
  2. Check the ink levels for the black and color cartridges.
  3. If the ink is low, replace the cartridge with a genuine HP one.

3. Align the Printhead

• Misalignment can cause lines on prints, so aligning the printhead may help:
  1. Go to Setup on the printer's control panel.
  2. Select Printer Maintenance or Tools.
  3. Choose Align Printhead.

4. Manually Clean the Printhead and Cartridges

• If the automatic cleaning doesn’t help, try manually cleaning:
  1. Turn off the printer and unplug it from the power source.
  2. Open the ink cartridge access door.
  3. Remove the ink cartridges and check for any ink buildup on the nozzles.
  4. Using a lint-free cloth slightly dampened with distilled water, gently wipe the nozzles and contacts.
  5. Allow them to dry completely before reinserting the cartridges.

5. Check for Paper or Debris in the Printer

• Check the printer for any bits of paper or debris that might be obstructing the print path.

6. Run a Print Quality Diagnostic Report

• You can run a diagnostic report to see what might be causing the issue:
  1. On the printer control panel, go to Setup > Printer Maintenance > Print Quality Report.
  2. Review the report to see if any particular issue stands out, like ink smearing or alignment issues.

7. Update Printer Firmware Update the firmware on an HP printer

• Make sure your printer’s firmware is up-to-date, as firmware updates can fix bugs that might cause printing issues.

8. Replace Faulty Cartridges

• If none of the above solutions work, you may want to consider replacing the black ink cartridge or both cartridges if the problem persists.

Refer to this document: HP OfficeJet Pro 6978 All-in-One Printer User manual 

HP OfficeJet 6900, 8010, 8020, 8030 printers - No black ink, wrong colors, other print quality issue...

I hope this helps. 

Take care and have a good day.

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