HP Photosmart C4780 - Manual (Page 87)

Solution 3: Remove and reinsert the print cartridges
Solution: One or both of the print cartridges are not installed or are installed
incorrectly. Remove and reinsert the print cartridges and verify that they are fully
inserted and locked in place. If the problem persists, clean the copper-colored
contacts of the print cartridges.
To clean the print cartridge contacts
1. Turn on the product and open the print cartridge door.
The print carriage moves to the center of the product.
2. Wait until the print carriage is idle and silent, and then unplug the power cord from
the back of the product.
3. Lightly press down on the print cartridge to release it, and then pull it towards you
out of the slot.
NOTE: Do not remove both print cartridges at the same time. Remove and
clean each print cartridge one at a time. Do not leave a print cartridge outside
the HP Photosmart for more than 30 minutes.
4. Inspect the print cartridge contacts for ink and debris buildup.
5. Dip a clean foam rubber swab or lint-free cloth into distilled water, and squeeze
any excess water from it.
6. Hold the print cartridge by its sides.
7. Clean only the copper-colored contacts. Allow the print cartridges to dry for
approximately ten minutes.
1 Copper-colored contacts
2 Ink nozzles (do not clean)
Errors 85
Solve a problem