HP 2 - Manual (Page 11)

are required electrical contacts.
1. ink nozzles 2. copper contacts
5. Slide the print cartridge firmly into the cradle at a slight upward angle until you
feel resistance.
6. Push the cartridge into the cradle.
You hear a snap when the print cartridge is correctly positioned.
7. Close the printer cover.
8. Calibrate the printer for optimum print quality.
For information on how to recycle your empty print cartridges, click here .
Warning! Keep both new and used print cartridges out of the reach
of children.