How do I refill the ink tanks on the HP Smart Tank 510?
To refill the ink tanks, open the front door, then open the cap of the ink tank you plan to refill. Depending on the type of ink bottle you have, either twist to remove a screw-cap or use the flip-cap method. Note that product service or repairs required as a result of filling the ink tanks improperly and/or using non-HP ink will not be covered under warranty. (Page 56)
From the official HP Smart Tank 510 Wireless All-in-One manual, page 56
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