My printer is printing horizontal black lines over everything??? Help!

try to replace magenta , Yellow , CYAN

Clean the nozzles, align the print heads, turn it off for about an hour. You may need to do this twice, but it works for me.

Push menu on your printer, then fin maintainance. Then go to clean printer and push the green button. It will clean the cartridges for you and that should help. 

check your drum may the corona ware is broken . change the drum.

Seems like the drum needs changing. This is the most common cause for print problems in these printers. If using the high yield TN 6600 toner then you need to change the drum every 3-4 toners. If using the low yield TN 6300 toner then the drum will need replacing every 6-7 toners. Hope this helps

hi

try to perform maintenance of your printer
on the setting
and open your printer clean up the nozzle
use alcohol and cotton buds and then placed it back properly!!

Hi

Please try with replacing the INK catridge, it will solve your problem

Boopathy.T

Is there any debris under the printhead nozzle plate?

Sounds like a bad imaging drum to me...

Have you tried updating the printer driver (first uninstall the existing driver and make sure you have the latest one already saved to your PC before starting). I don't think your current one has mysteriously misbehaved, I suspect that it has been corrupted in some way (a new download may have done something to a critical part of the driver). By deleting and re-installing you are "refreshing" everything. Good luck!