HP 3500cp Service Manual - Page 152

Test Pattern 5: Color Variation Test This test produces four boxes; black, blue, cyan and yellow. In each box there are three horizontal bands, the two outer bands are 100% shade, the inner band is shaded from 100% scaling to 75%. The purpose of this test is to determine at what percent the middle shading becomes visible from the two outer bands. The best way to do this is to cover the box with a piece of paper and slide the paper horizontally across the box. Stop as soon as you see a different shade in the middle box. You can then determine the percentage scaling from the figure at the top of the box. Example E (Correct) Example F (Incorrect) Variation Problem: Corrective Action: If the middle box shading is only visible below 90% it is an indication that the printhead is producing incorrect size ink drops (see Example F). Select Color Calibration to Now. 6-16 HP DesignJet CP Series Printers Image Quality