HP Officejet J5740 All-in-One Printer - Manual (Page 171)

7. Flip the tray extender up toward you.
NOTE: When you use legal-size paper, leave the tray extender closed.
Cause: The protective plastic tape was only partially removed from the print
cartridge.
Solution: Check each print cartridge. The tape might have been removed from the
copper-colored contacts, but still might cover the ink nozzles. If the tape is still
covering the ink nozzles, carefully remove the tape from the print cartridges. Do not
touch the ink nozzles or the copper-colored contacts.
1 Copper-colored contacts
2 Plastic tape with pink pull tab (must be removed before installing)
3 Ink nozzles under tape
Print troubleshooting 169