Dell 3110cn Color Laser Printer - Manual (Page 309)

Installing a New Fuser
Unpack a new fuser and hold both sides of the fuser with both hands. 1.
With the connector of the fuser toward the slot, push the connector into the slot firmly. 2.
NOTE: Make sure that the fuser connector is firmly seated.
Lock both levers at the ends of the fuser. 3.