Xerox Phaser 7700 Service Manual page 190

Caution
Be careful when moving the stops. They are easily broken and may
come out completely.
6.
Remove the screw holding each dispense assembly to the printer.
7.
Remove the dispense assembly by pulling both the top and bottom sections
evenly away from the printer.
Note
The flexible tubing is not secure and can come apart during
removal and replacement causing toner spillage.
Service Quick Reference Guide - Removal & Replacement Procedures 7-167