Problem with poor printing appears to be related to scanning. That is, after scanning a document the problem started. The printer is old and has never been a problem. This has happened once and I fixed it but do not remember the details
I understand your printer prints horizontal lines.
Don't worry I'd love to help you out.
Did you make any changes to your printer?
What happens when you make a copy from your printer?
Please try the steps recommended below.
If you found defects on the print quality diagnostic report, follow these steps to run an automated tool to clean the printhead.
Load plain white paper in the input tray.
From the printer control panel, touch the Setup icon ().
Touch Tools, and then touch Clean Printhead. The printer cleans the printhead and then prints a test page.
Evaluate the print quality on the test page.
If the quality is unacceptable, touch Proceed and then, when prompted to continue the next level of cleaning. Repeat these steps for each cycle of cleaning, if necessary.
If the printhead is badly clogged, it might require another cleaning cycle. If so, wait 30 minutes before you perform all three levels of cleaning again.
If the print quality is acceptable, touch Done and then, continue to the next step to align the printer.
Evaluate the test page to see if the issue is resolved.
If the print quality on the test page is acceptable, touch Done and then continue to the next step to align the printer.
Refer this article to further troubleshoot print quality issues.
Let me know how it goes!
Have a great day ahead! 🙂
A4Apollo I am an HP Employee
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