HP Designjet L26100 HP Designjet L26500 / L26100 printer series - Maintenance - Page 65

Troubleshoot images ◦ If applicable, tell the RIP to group jobs together, so that printer temperatures remain more stable between jobs. ◦ Modify your media preset as suggested in Color reproduction tricks on page 53. ● Irregular or isolated vertical bands ◦ Increase the vacuum level in steps of 10 mmH2O. Do not exceed the following limits: 20 mmH2O for banners, 35 mmH2O for vinyl, and 50 mmH2O for other substrate families. ◦ In backlit applications, increase the number of passes to 20 or more, and change the drying temperature up and down in steps of 5°C. ◦ If the banding appears only at the beginning of the print, disable the cutter and advance the substrate manually about 100-150 mm before the first print. The print is deformed into a curved shape This may occur as a result of substrate bow deformation. See The substrate has bow deformation on page 68. Misaligned colors If the colors are misaligned in any direction, the printheads may be misaligned. This is likely if you have not aligned the printheads for a long time, or if there has been a substrate jam. Align the printheads if necessary (see Align the printheads on page 9). You can check whether it is necessary by using the printhead status plot (see Use the printhead status plot on page 54). Color intensity varies If some printhead nozzles are in use while others in the same printhead are not, water evaporates slowly from the ink in the unused nozzles, making the color more intense. Thus, in such cases you may notice variations in color intensity in areas where the color of the image should be constant. ENWW The print is deformed into a curved shape 59