HP Photosmart C6340 All-in-One Printer - Manual (Page 298)

10. Gently bend the tab away from the ink cartridge.
CAUTION: Be careful not to bend the tab out more than about 1.27 cm
(0.5 inches).
11. Reinstall the ink cartridge.
It should now snap down into place.
12. Close the ink cartridge access door, and check if the error message has gone
away.
13. If you still receive the error message, turn the product off, and then on again.
For more information, see:
“Replace the ink cartridges” on page 123
Cause: One or more of the ink cartridges were not installed.
If this did not solve the issue, try the next solution.
Solution 3: Clean the ink cartridge contacts
Solution: Clean the ink cartridge electrical contacts.
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