HP Scanjet Enterprise Flow N9120 Flatbed Scanner - Manual (Page 17)

3. Raise the cartridge stall latch.
4. If you are replacing an empty print cartridge, slide it to the right to remove it from the cartridge stall.
5. Remove the print cartridge from its packaging. Pull the tab to remove the protective tape from the nozzles.
6. Hold the new print cartridge with the nozzles down and slide it into the cartridge stall.
7. Lower the cartridge stall latch to lock the print cartridge in place.
Set up and use the imprinter 15