Dell A920 All In One Personal Printer - Manual (Page 10)

Characters are not printing completely.
White dashes appear in graphics or printed text.
Print is smudged or too dark.
Colors on print jobs are faded or they differ from the colors on the screen.
Vertical lines are jagged or edges are not smooth.
To clean the nozzles:
Load plain paper in the printer. 1.
Open the Dell Printer Solution Center. For help, refer to your Owner's Manual. 2.
From the Maintenance tab, click Clean to fix horizontal streaks. 3.
Click Print. 4.
A nozzle page prints, forcing ink through the nozzles to clean the clogged nozzles.
Print your document again to verify your print quality has improved.
NOTE: If print quality has not improved, try cleaning the ink cartridge nozzles up to two more times.