Note the code shown on the white label stuck on the print head. You will be asked for this code in Step 8.
2.
Take the new head and insert it vertically (white connector upwards) raising it in the two guides so as to trap the lugs of the fork in their slots
the two forks 2, a click will be heard.
3.
Connect the cable into its socket, making sure it is the right way round. Do not use any force, as this part is relatively fragile. Press down on each side of the connector to ensure