Printhead Adjustment 4 Tighten the two fixing screws so that the Printhead Adjustment Jig 1 is securely attached to the Carriage Base Plate. Fixing Screws 5 Install the Printhead Adjustment Jig 2 in to position against the Carriage Base Plate. This corner of the Printhead should touch the Printhead Adjustment Jig 2 6 Stretch the spring and hook the key over the top screw of the Printhead Adjustment Jig 1 as shown. Key Screw Spring 3-6 HP Designjet 9000s Series Printer Service Manual Make sure the Printhead Adjustment Jig 2 is located against this pin Printhead