Gerber Edge Owner's Manual page 36

The GerberColor Cartridge.
7. Rest the color cartridge on the support tabs below the printhead
assembly. Align the center notches in the sides of the color cartridge
with the center pins and seat the cartridge on the fixed pins in the
right side of the printhead assembly.
Installing the color cartridge.
8. Release the left center cartridge pin, then release the top and bottom
cartridge pins.
9. Press the Foil Slew key to slew the foil slightly to ensure that the
color cartridge has been properly loaded.
10. Close the cover.
Procedures for using the GERBER EDGE 31