Printhead Adjustment 4 Using the measurement obtained in step 2, calculate how many scales you will need to turn the Vertical Adjustment Screw to adjust the vertical position of the Printhead. 1 Scale = 10 micromillimeters 1 Turn = 100 micromillimeters Vertical Adjustment Screw 5 If for example, the deviation measured in step 2 was 240 micro-millimeters, you would turn the Vertical Adjustment Screw 2 full turns and 4 scales. 6 Tighten the front screw that secures the Printhead to the Carriage Base Plate. 7 Reprint the Check Printhead pattern and measure again the deviation of the Printhead in the vertical position. If there is still deviation, repeat the instructions from step 3.
3-16 HP Designjet 9000s Series Printer Service Manual