1Good Printing Effect: Single black print head, which can replace original print head to print documents. 2Strict Quality Control: Each print head will be strictly tested, and the effect of the print head will be tested with printing test paper. 3Easily Use: This product is a perfect replacement for the old print head, very convenient to use,and the structure is compact, small and light. 4Safe Packaging: Equipped with a protective cover to prevent damage to the internal structure and effectively protect the print head. 5Wide Compatibility: Compatible with for Pixma MX720, for MX721, for MX722, for MX725, for Pixma MX920, for MX924. Item Type: Printhead ReplacementMaterial: ABSModel: QY6-0086Color: Black and YellowFunction: For Printer Print HeadCompatible Models: For iX6840 series, for Pixma MX720, for MX721, for MX722, for MX725, for Pixma MX920, for MX924, for MX926, for MX927Abnormal solutions:The problem with error code 5100 and B200 is caused by the ink truck being stuck or the ink truck not being reset in time.Solution 1. Remove the ink cartridge and reinstall it, and then restart the computer and printer.2. If this fault occurs frequently, check the ink supply line, or add lubricating oil to the trolley slide bar.3. Manually reset the ink trolley Open the cover Push the ink cartridge to the right Turn off the cover Turn off the power Turn on the power Turn on the cover Observe whether the ink cartridge automatically slides to the right Use your hand to slightly increase the force to the right again while the ink cartridge slides Feel that the ink cartridge has reached its full limit Close the cover and complete the operation. 1 x PrintheadReplacement Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.