How to Clean the HP DeskJet 3524 Printhead

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Next, remove the orange cover. Use caution as the display unit is still attached to the cover. If you pull the cover off too quickly, you could tear the flat cable.
In the second and third pictures, you will see 2 black plastic buttons. Push on the buttons and the display unit will separate from the orange cover.
When reassembling, ensure the white flat ribbon cable is correctly attached. If it is not attached correctly, you will be unable to push the orange cover closed.

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