Features: 1100% Functional Test: When generated the print head will be tested for 100% functionality. All products will not be shipped until they pass the tests. 2Wide Compatibility: Our print head replacement for iPF650 iPF655 iPF670 iPF671 iPF680 iPF681 iPF685 iPF686 iPF750 iPF755 iPF760 iPF765 iPF770 iPF771 iPF780 iPF781 iPF785 iPF786 iPF830 iPF831 iPF840 iPF841 iPF850 iPF851. 3Great Printhead Replacement: With stable performance and high reliability and safety our print head has great use experience. It is suitable for replacing your damaged products. 4Long Term Use: The printhead has undergone strict material selection and accurate processing to ensure its lightweight rust resistant colorfast and durable. 5Easy to Install: It is easy to install just remove the old printer head and install the new one. Be sure to cut off the power before installation. Specification: Item Type: Print HeadMaterial: ABSWeight: Approx. 186g/6.56ozApplication: For iPF650 iPF655 iPF670 iPF671 iPF680 iPF681 iPF685 iPF686 iPF750 iPF755 iPF760 iPF765 iPF770 iPF771 iPF780 iPF781 iPF785 iPF786 iPF830 iPF831 iPF840 iPF841 iPF850 iPF851 Package List: 1 x Print Head Note: 1.The product is brand new there may be some protective fluid which is to preserve the accessories and is a normal condition.2.Solution for incompatible method: Reset the printer Please follow the steps below to reset the printing device. Turn on the printer (if it is not already on). Allow the printer to come to a complete standstill before proceeding with the operation. After starting the printer disconnect the power cord from the back of the printer. Unplug the power cord from the wall outlet. Wait at least 60 seconds. Insert the power cord plug back into the wall outlet. NOTE: It recommends that the printer power cord be plugged directly into the wall outlet. Reconnect the power cord to the back of the printer. Turn on the printer (if it is not already on automatically). The printer may need to warm up for a period of time. The printer light may flash and the pen holder may move. Wait until the printer has finished warming up and is completely stationary before proceeding. If the above does not solve the compatibility problem you will need to replace the original ink cartridge and ink.