Dell 5110cn Color Laser Printer - Manual (Page 73)

Insert the four screws provided into the four holes inside the printer and tighten them to secure the
printer to the optional 500-sheet tray module. 5.
NOTE: Make sure the screws are firmly tightened.
Insert the tray into the printer. 6.
Reattach the paper tray cover to the back of the printer. 7.
8.