HP Deskjet 990cxi Printer - Manual (Page 42)

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Print Cartridges: Damage Resulting from Refilling the Print Cartridges
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 your printer are:
Black hp 516 45 series or hp No. 45
Tri-Color hp C65 78 series or hp No. 78