HP Deskjet 2540 All-in-One Printer - Manual (Page 78)

6. On the inside of the printer, locate the contacts for the cartridge.
The printer contacts are the set of gold-colored bumps positioned to meet the contacts on the ink
cartridge.
7. Use a dry swab or lint-free cloth to wipe the contacts.
8. Reinstall the ink cartridge.
9. Close the cartridge access door, and check if the error message has gone away.
10. If you still receive the error message, turn the printer off, and then on again.
NOTE: If one ink cartridge is causing problems, you can remove it and use the single-cartridge
mode to operate the HP Deskjet 2540 series with only one ink cartridge.
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74 Chapter 8 Solve a problem ENWW