Xerox 7750DXF - Phaser Color Laser Printer Service Manual page 233

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 8-26,
"Dispense Assembly," on page 8-29).
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.
Caution
The flexible tubing is not secure and can come apart during removal and
replacement causing toner spillage.
Service Parts Disassembly 8-21