HP Photosmart C6340 All-in-One Printer - Manual (Page 272)

To clean the electrical contacts
1. Make sure the product is turned on.
2. Open the ink cartridge access door by lifting from the front right of the product,
until the door locks into place.
The print carriage moves to the center of the product.
NOTE: Wait until the print carriage stops moving before proceeding.
3. Locate the ink cartridge that is indicated in the error message, and then press the
tab on the ink cartridge to release it from the slot.
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
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