HP Photosmart C6340 All-in-One Printer - Manual (Page 300)

4. Hold the ink cartridge by its sides with the bottom pointing up and locate the
electrical contacts on the ink cartridge.
The electrical contacts are four small rectangles of copper or gold-colored metal
on the bottom of the ink cartridge.
1 Ink window
2 Electrical contacts
5. Wipe the contacts with a dry swab or lint-free cloth.
CAUTION: Be careful not to move any ink or other debris onto the clear
plastic ink window next to the contacts.
6. On the inside of the product, locate the contacts in the printhead.
The contacts look like a set of four copper or gold-colored pins 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.
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