Copy function does not work

[Mr_HG]

While copying, using "black" the color on the output page changed from black to green and finally to yellow. Now it turns out blank pages.

On checking the ink cartridges they showed all to be  25% - 30% full.

I cleaned the copy surfaces of the printer.

Unplugged it.

Did the factory reset.

It did not fix the problem.

Printing from the Mac is not a problem.

I've been using a work-around by scanning in the document and then printing the pages from the Mac. Obviously this is not the solution.

Who can help? By the way, it is still under warranty.

[sandytechy20]

@Mr_HG

Welcome to the HP Forums. I would be happy to help you with your HP Officejet Pro 6978 printer. I understand that you are getting print quality issues and you have already done some preliminary troubleshooting. 

Don't worry though as I have a few steps to determine the issue and find a solution as well,

• Clean the scanner.
• Change the copy settings.
• Change the paper settings.

Click here to refer the document and perform troubleshooting steps to fix this issue.

If the issue is resolved and you appreciate my help,

Please click the "Accept as Solution" button and the "Thumbs Up".

Let me know how you make out.

Cheers

[Mr_HG]

Thank you for your reply. I allready did the troubleshooting before, but nothing changed. I also looked at the settings, but notihing appears to be off.

[sandytechy20]

@Mr_HG

Thanks for the reply.

I appreciate your effort in performing all the steps.

It seems to be a hardware issue.

I request you to contact HP phone support for assistance.

Cheers.