Horizontal blank strips.

[Eli002]

Hello. I recently bought this HP Smart Tank 515 printer and everything was fine till now. If print or copy a black only file, my print has horizontal lines as shown below. However if I choose to print colored, everything is fine. My black ink level is not low, It's about 80% full. I tried many things to fix this (cleaned printer heads, did diognosis stuff, checked all the parts etc.) but nope. Any idea what else I can do? Print quality report also has these lines. I refilled the inks from the same brand but only black ink has this problem.

[Garp_senchau]

@Eli002, Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

• Run a deep cleaning cycle for the black ink, multiple times if needed.
• Try a new black ink cartridge to see if the refill is causing the problem. I suggest you use HP genuine cartridges.
• Manually clean the printhead (check your printer’s manual on how to do this).
• Check the ink delivery system for blockages or leaks.
• Reset your printer to factory settings if nothing else works. Keep this as a last resort. Refer to this guide: Click here
• Update the printer’s firmware to the latest version. 

I hope these steps help resolve the issue

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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Regards,