HP Color LaserJet Enterprise M751n Laser Printer - Manual (Page 84)

3. Grasp the front of the toner-collection unit and
remove it from the printer.
4. Remove the new toner-collection unit from its
packaging.
5. Install the new unit into the printer. Make sure the
toner-collection unit is firmly in place.
74 Chapter 3 Supplies, accessories, and parts ENWW