HP Designjet 2800/3800cp Service Manual - Page 156

Nozzles Problem 1: Nozzles Problem 2: Corrective Action: Some printhead nozzles, in any one color, are not printing. Printhead nozzles are misdirected in any one color. Try the following steps: 1 From the Image Quality/ Printhead service / Printhead check Menu, set to Now to run the printhead check. 2 From the Utilities / Service tests menu, select "Recover printheads" to run the printhead recovery process. 3 Print the Image Quality Print again to see if there has been any improvement. 4 If there has been no improvement, try reinstalling the Ink System Components and print the Image Quality Print again. 5 If the error is still present, replace the Ink System Components and print the Image Quality Print again. 6 If the error continues try the following: D Perform the Electronics Test ' page 4-7. D Replace the Trailing Cable ' page 8-36. D Replace the Carriage Assembly ' page 8-42. Test Pattern 4: Color Alignment Quality Test This test pattern is to check the color alignment, and produces 6 patterns each with 2 different primary colors. In each pattern you will see primary color circles. If there is misalignment between the primary colors the composite color will be present in one part of the circle and white will be visible at the opposite side of the circle. There are two types of misalignment (see Example D): D Horizontal - when the misalignment is in the horizontal axis. D Vertical - when the misalignment is in the vertical axis. 6-14 HP DesignJet CP Series Printers Image Quality