Xerox Phaser 6120 Replacement Manual page 8

8 Align the shaft on each end of the toner cartridge with its holders, and
then insert the cartridge.
9 Press down on the toner cartridge until it snaps into place.
Replacing Consumables
Before inserting the toner cartridge, make sure that the color of the
toner cartridge to be installed is the same as the label on the toner
cartridge carousel.
83