Printhead Adjustment 10 Attach the Ink Tube to the Printhead and secure it tightly. 11 Attach the Printhead Connector Assembly to the Printhead and secure it with 2 screws. 12 Before moving to the next stage of the Printhead Adjustment procedure, make sure that the Printhead Connector cables are safely secured with tape so that they don’t hit other parts of the Printer. Secure with tape 13 Enter into the Ink System Options submenu and select "Wash Printheads" in order to charge the replaced Printhead with ink. 14 Print a Nozzle Check pattern in order to verify that ink has been charged correctly into the Printhead.
If any of the nozzles are not firing correctly, then perform a Normal Printhead Recovery and then retry the nozzle Check pattern. 3-8 HP Designjet 9000s Series Printer Service Manual