HP C4780 User Guide - Page 81
Solution 3: Make sure the protective tape is removed from the print cartridges - ink cartridge problem
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Solution 3: Make sure the protective tape is removed 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. Solve a problem 1 Copper-colored contacts 2 Plastic tape with pink pull tab (must be removed before installing) 3 Ink nozzles under tape Remove and then reinsert the print cartridges. Verify that they are fully inserted and locked in place. Cause: Protective tape was covering the print cartridges. If this did not solve the issue, try the next solution. Solution 4: Check if print cartridges are fully inserted Solution: Remove and then reinsert the print cartridges. Verify that they are fully inserted and locked in place. Cause: The contacts on the print cartridge were not touching the contacts in the print carriage. If this did not solve the issue, try the next solution. Errors 79