The procedure for removing a printhead depends on the model of the printer you are using. To remove the printhead of an HP printer, turn on the printer, open the cartridge access door, remove the cartridges, lift the latch handle and remove the printhead.
A printer requires a replacement printhead if the current printhead is damaged or incompatible with the product. Printer manufacturers advise their customers to contact authorized service providers for replacement services. Before you remove the printhead, power on the printer to open the cartridge access door. When you remove the cartridges, do not leave them outside the printer for more than 30 minutes. According to HP's support team, leaving cartridges unattended could damage the cartridges and the printer.
Once you remove the cartridges, locate the print carriage and lift the latch handle on it until it stops. This allows you to access and remove the printhead. Lift the printhead out of the printer slowly and insert the replacement printhead. If you want to clean the printhead, clean the plastic ramps, the electrical contacts and the edges of the contacts and nozzles. To place the printhead back in the printer, lower the latch handle, reinsert the cartridges and close the cartridge access door.