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Changes to HP Envy 7640 Printhead Replacement Introduction

Edit by Nicholas Greco

Edit approved by Nicholas Greco

The printhead is the "arm" of the printer that carries out the instructions it receives from the motherboard. Replacement of the printhead violates the warranty on HP printers. Proceed through this guide with caution. While following the steps in this guide, ensure your printer is grounded (plugged into a wall socket rated for 15A, 120V) to ensure that static discharge does not damage your printer after the replacement.