Dell 5110cn Color Laser Printer - Manual (Page 231)

Partial blanks, creased paper
or blotted printing. · Condensation inside the printer causes partial blanks or creased paper.
Turn on the printer and leave it one hour at least to get rid of the
condensation. If the problems still occur, contact Dell. See "Contacting
Dell" in the Owner's Manual.
Vertical blanks · The developer is damaged. Contact Dell. See "Contacting Dell" in the
Owner's Manual.
· The raster output scanner (ROS) is broken. Contact Dell. See "Contacting
Dell" in the Owner's Manual.
· The mirror in the printer is broken. Contact Dell. See "Contacting Dell" in
the Owner's Manual.
Wireless Adapter Problem