Genuine Canon QY6-0073 Printhead for Pixma IP3600 MP540 MP620 MX860 MX870 Printer Print Head Please pay attention:Any malfunction of Mainboard or malfunction of cleaning unit will result in short circuit of the new printer.And Non-Genuine ink may block a new printer.In these circumstances,a new printer may lose efficacy. This printhead is Only compatible with Canon IP3600 MP540 MP620 MX860 MX870. Please confirm the fault part of your printer before you decide to replace a printhead. For example: *If you get Error 5100,you need to: a. Clear debris from carriage head to eliminate canon error 5100. b.	Make sure you set the ink cartridges properly. c.	Lubricate the purge cap. d.	Clean the Timing film. It is not the fault of printhead.* If the printhead cant print colors.Please take out the printhead from your printer,and use a white tissues to touch the mouth of the printhead.If the color print on the tissues,it means not the fault of printhead,and you need to continue to troubleshoot. Please contact us, if you get error B200. Make sure you purchase the right model of printhead.