recently colors are not printing true. Red is printing purpose, yellow is printing green, etc.

[dkh2]

Officejet 8600 Premium 

[Betty0610]

@dkh2

Welcome to the HP Support Community.

Does this happen while copying too?

Clean the printhead:

To clean the printhead, go to Tools on the printer control panel.

1. Load plain white paper into the tray.

2. On the printer control panel, touch the Right Arrow () to display additional options.

3. Touch Setup (), and then touch Tools.

4. Touch Clean Printhead. There are three cleaning stages. A test page (different from the Print Quality Diagnostics page) prints between each cleaning stage. Do not use this test page for analysis. Touch No when prompted to continue the next level of cleaning.

5. Print another Print Quality Diagnostics Report to determine if the issue is resolved.

Let me know how the report looks.

If the issue persists, please perform the remaining steps from this document: https://support.hp.com/us-en/product/hp-officejet-pro-8600-premium-e-all-in-one-printer-series-n911/...

Let me know if this helps.

If the information I've provided was helpful, give us some reinforcement by clicking the Accepted Solution button, that'll help us and others see that we've got the answers!

Thanks!

Have a great day!