To see which color is having an issue, go to printer control panel and select "settings" > Tools> Print report> Print Quality report. When the page prints out, you will see which color is the problem. After you have figured that out, make sure the problem is not with the cartridge.
If you see lines or missing colors, clean the printhead by removing it from printer(open cover, lift gray latch on the right side of the cartridges, remove cartridges and the printhead will easily slip out by pulling up)
then soak the printhead in half inch deep amount of window cleaning solution. Preferably warm. Let soak at least 3 hours. Dry out the printhead and wipe rear conacts from moisture and dirt. Reinstall into printer and see the results.
303Electronics eBay Stores http://www.303electronics.com/
If you need further help, I’m available over the phone at https://www.6ya.com/expert/alex_22751bbefa74c3d0