HP Deskjet 3820 Color Inkjet Printer - Manual (Page 52)

6. Remove the replacement print cartridge from its packaging and carefully
remove the plastic tape.
1. black cartridge 2. color cartridge 3. ink nozzles 4. copper contacts 5.
plastic tape
Caution! Do not touch the print cartridge ink nozzles or copper contacts.
Touching these parts will result in clogs, ink failure, and bad electrical
connections. Do not remove the copper strips. They are required electrical
contacts.
7. Push the print cartridge firmly into the cradle.
1. copper contacts
8. Secure the cradle latch.
9. Close the top cover.