HP (Hewlett Packard) Color LaserJet 2840 (Q3950A) is a all-in-one printer/copier/scanner/fax machine manufactured by HP. Laserjet 2840 prints up to 4 ppm color, 20 ppm black with resolution 600 x 600 dpi. HP Color LaserJet 2840 uses HP (Hewlett Packard) Black 122A and three Color 122A 123A Cyan, Yellow, Magenta cartridges. Cartridge model numbers are Q3960A, Q3961A, Q3962A, Q3963A, Q3971A, Q3972A, Q3973A. HP (Hewlett Packard) Color LaserJet 2840 also uses one imaging drum unit with part # is Q3964A.