Epson WorkForce Pro WF-7820 All-in-One Inkjet Printer - Manual (Page 289)

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6. Check the printed pattern to see if there are gaps in the lines.
Print head is clean
Print head needs cleaning
7. If there are no gaps, click Finish .
If there are gaps or the pattern is faint, clean the print head.
If you don’t see any improvement after cleaning the print head up to 3 times, turn off the product and wait
at least 12 hours. Then check the print head nozzles and try cleaning the print head again, if necessary.
If quality still does not improve, contact Epson.
Parent topic: Print Head Nozzle Check
Related concepts
Print Head Cleaning
Related tasks
Removing and Installing Ink Cartridges
Loading Paper in the Cassette and Paper Tray (Rear Paper Feed Slot)
Checking the Nozzles Using the Product Control Panel