Features: 1ABS Material: The printer replacement head is made of selected ABS material which is environmental friendly lightweight rustproof colorfast and durable. 2Quality Assurance: Each material has been selected many times only to choose the material with the best performance. And go through functional testing after production and before shipping to ensure that the printheads run smoothly on your machine. 3Applicable Models: This printhead replacement is designed for HP6230 6830 6815 6812 6835 6220 934 935 printing machines. Highly compatible with the printer upgrade your printer machine. 4Reliable Replacement: It is a reliable aftermarket product with stable performance suitable for replacing your broken parts of the printer. 5Convenient to Use: Printer accessories is of simple installation no complicated disassembly just simple installation steps save your time and make your life easier. Specification: Item Type: PrinterReplacementHeadMaterial: ABSGross Weight: 91g / 3.2ozApplicable Models: Suitable for HP623068306815681268356220934935 Package List: 1 x PrinterHead Note: 1. The product is a new product there may be some protective liquid it is protection for the accessories it is normal.2. Solution for incompatibility: Reset the printer Follow the steps below to reset the printing device.(1) Turn on the printer (if not already turned on); wait for the printer to come to a standstill before continuing.(2) After turning on the printer disconnect the power cord on the back of the printer. Unplug the power cord from the wall outlet. Wait at least 60 seconds. Plug the power cord back into the wall outlet.(3) Note: It is recommended to plug the printer power cord directly into the wall socket. Reconnect the power cord to the back of the printer.(4) Turn on the printer (if it has not been turned on automatically). The printer may need to warm up for a while. The printer lights might be blinking and the carriage might move.(5) Wait for the printer to warm up and completely stand still before performing the operation.If the above methods cannot solve the compatibility problem you need to replace the original ink cartridge and ink.