Xerox 7700DX - Phaser Color Laser Printer Service Manual page 211

5. Pull the shut off gate of each toner cartridge toward you (approximately
3/4" [or 20mm]) to shut off the toner supply for each toner tube (see
Figure 7-26, "Dispense Assembly," on page 7-180).
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.
Phaser 7700 Color Laser Printer Service Manual
7-181