HP 3840 - Manual (Page 61)

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 by aligning the print cartridges for optimum print quality.
For information about storing print cartridges, see the print cartridge storage page.
For information about recycling empty print cartridges, see the print cartridge
recovery page.
Warning: Keep both new and used print cartridges out of the reach of
children.
HP Deskjet 3840 series printer User's Guide
61