How do I install the printhead during setup?
Open the covers and wait for the carriage to move to the center of the product and stop, then turn the orange handle. Press the blue latch down to open it, remove and discard the orange plastic piece carefully to avoid ink stains, then install the printheads and close the blue latch and covers. (Pages 4–6)
From the official HP Smart Tank Plus 550 Wireless All IN One manual, page 4
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