HP M277 dw putting blue dots on paper every 1 inch on left side of paper

[craup]

I am getting blue dots on the left side of every copy about 1 inch apart. I replaced the cyan cartridge and it still does it. Other than this, I love my printer. 

[sandytechy20]

@craup

Welcome to the HP support community.

I understand that you are getting print quality issues, I am glad to assist you.

Inspect the toner cartridge for damage

• Check the toner cartridge for damage if there are issues like toner smears on the printed pages.
• Remove the toner cartridge from the printer, and then make sure that the sealing tape has been removed.
• Grasp both ends of the toner cartridge, and then gently rock the cartridge back and forth to distribute the toner.
• Figure : Gently rock the toner cartridge back and forth
• 
• Check the memory chip for damage.
• Slide back the cartridge cover to expose the imaging drum.
• CAUTION: Do not touch the roller (imaging drum) on the toner cartridge. Fingerprints on the imaging drum can cause print quality problems.
• Figure : Slide back the cartridge cover
• 
• Examine the surface of the imaging drum on the toner cartridge.
• If you see any scratches, fingerprints, or other damage on the imaging drum, replace the toner cartridge.
• If the imaging drum does not appear to be damaged, close the cover, and then reinstall the cartridge in the printer.
• Try to print again to see if the issue is resolved:

Refer to this HP document for further assistance:- Click here

Keep me posted.

If this helps, please mark the public post as an accepted solution so that it benefits several others.

Cheers.