950 951 Print head For CM 751 752 Hp 8100 8600 8610 8620 8630 8640 251dw 276dwBefore you buy this product, you need to pay attention to: NOTE: The printer must be disconnected from the power source before the print head is installed, otherwise it has the risk of causing the print head circuit board to burn out. 1. When the print head is shipped, a protective liquid will be applied to the print head. Before using it for the first time, wipe the print head before installing it. Just wipe the copper sheet gently, wipe it clean