HP Photosmart C4780 - Manual (Page 86)

9. Repeat if necessary for the other print cartridge.
10. Gently close the print cartridge door and plug the power cord into the back of the
product.
Cause: The print cartridge was missing.
If this did not solve the issue, try the next solution.
Solution 2: Remove the tape from the print cartridges
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
Cause: Protective tape was covering the print cartridges.
If this did not solve the issue, try the next solution.
Chapter 12
84 Solve a problem
Solve a problem