HP Photosmart D7560 Printer - Manual (Page 206)

If the problem is not resolved, printing can continue, but the ink system behavior might
change.
CAUTION: The cleaning procedure should take only a few minutes. Make sure
that the ink cartridges are reinstalled in the product when instructed. Leaving them
outside of the product for an extended period of time can result in damage to the
ink cartridges.
To clean the sensor window on the ink cartridges
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. Remove all of the ink cartridges and place them on a piece of paper with the ink
openings pointing up.
To remove the ink cartridges
a. Press the tab on the ink cartridge to release it, and then remove it from the
slot.
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