Xerox Phaser 7750 Reference Manual page 60

Adding Staples
1.
Open Finisher Door J.
2.
Pull the staple cartridge to the front of the finisher.
3.
Remove the staple cartridge by lifting the gold handle.
Phaser® 7750 Color Laser Printer
2-26
Basic Printing
7750-067
7750-068
7750-069