HP PageWide 6000 User Guide - Page 158

Calibrate print bar Color variation in the bands in the top part of the plot indicates a possible problem in the color calibration. The central part of the plot indicates whether the print bar is correctly calibrated. The vertical lines indicate the boundaries of the different print elements within a printhead (die boundaries). In the horizontal gray band, no repetitive white lines or dark lines should be seen above the die boundaries. The horizontal lines of different colors should be continuous and not broken or jagged at the die boundaries; if this occurs, a printhead alignment is required. If you see defects, you should calibrate the printer by tapping Calibrate print bar in the optimize print quality app. You should also calibrate the printer if you are warned that a roll has a calibration pending status. Print-bar calibration includes printhead alignment and color calibration. You can check what calibrations have been done in the past by tapping the Calibration history button; and you can restore the original factory calibrations at any time. NOTE: Make sure that the room temperature during calibration is similar to the temperature during normal printing. Big temperature differences (> 10°C) can affect the calibrations. NOTE: Some paper types cannot be calibrated. 152 Chapter 9 Print quality ENWW