Xerox WorkCentre Pro 575 Advanced Features Manual page 291

5. Install the Drum Cartridge into the machine, aligning the guides of
the cartridge with the grooves inside the machine.
Color coordinated "1" labels have been affixed to the Drum
Cartridge and to the inside of the machine. Install the Drum
Cartridge by aligning these labels.
Book
19
Make sure the Drum Cartridge is inserted inside the machine as
far as it will go.
WorkCentre Pro 555/575 C-27