HP Photosmart C6340 All-in-One Printer - Manual (Page 302)

To clean the sensor in the product
1. Gather swabs or a lint-free cloth to use for the cleaning procedure.
2. Make sure the product is turned on.
3. 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.
4. Locate the sensor inside the product.
The sensor is a square, black plastic part slightly larger than a pencil eraser, just
to the left of the print carriage.
5. Wipe the sensor with a dry swab or lint-free cloth.
6. Close the ink cartridge access door, and check if the error message has been
resolved.
7. If you still receive the error message, turn the product off, and then on again.
Cause: Ink might have built up and covered the sensor.
If this did not solve the issue, try the next solution.
Solution 2: Clean the sensor windows on the ink cartridges
Solution: Clean the window on all of the ink cartridges.
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