Dell 5110cn Color Laser Printer - Manual (Page 84)

Gently pull out the tray of the optional 500-sheet tray module until it stops. Hold the tray with both
hands, lift up the front slightly and remove it from the tray module. 4.
Lift the optional 500-sheet tray module and align the four guide pins of the optional 1000-sheet tray
module with the holes at the bottom of the 500-sheet tray module.
Gently lower the 500-sheet tray module onto the 1000-sheet tray module. 5.
Insert the four screws provided into the four holes inside the optional 500-sheet tray module and 6.