Compatible With The Following Printers: iX6840, iX6850 series, Pixma MX720, MX721, MX722, MX725, Pixma MX920, MX922, MX924, MX925, MX926, MX927 Printer NOTE: 1.Please confirm your Printer Model before placing order. 2.To prevent the static affect the stability of the chip, please do not touch the chip. 3.Before installing the new printheads, please make sure printer works properly(Otherwise the mainboard may burn it which causing the printer refusing to print).Then remove the cover and the protective film of the printhead to install. 4.Use the printer automatic cleaning function to clean the printhead 2 to 3 times in order to keep your printer running smoothly. 5.If the printhead do not recognize your printer at the first time, please use eraser or cotton swab to clean the chips softly, then reinstall the printhead and restart the printer. 6.The printheads must use with suitable ink cartridges, dye ink and pigment ink can not be used mixedly. 7.Each printhead has pass tested before we send it to you. please use it in confidence. Any issues please feel free to contact us