HP Deskjet 842c Printer - Manual (Page 39)

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Using and Caring for Your Print Cartridges 3
Damage Resulting from Refilling the Print Cartridges
To get the best performance from your printer, Hewlett-Packard recommends
using only genuine HP supplies for HP DeskJet printers, including genuine
factory-filled HP print cartridges.
Damage resulting from the modification or refilling of HP print cartridges is
specifically excluded from the coverage of HP printer warranties.
Note: When buying replacement print cartridges, check the part numbers
carefully. The print cartridge numbers for the 840C, 842C, and 843C
printers are:
Black HP No. [15] (equivalent to C6615 Series)
Tri-Color HP No. [17] (equivalent to C6625 Series)