HP Latex 260 Maintenance and troubleshooting guide - Page 62

necessary (see Align the printheads on page 11). You can check whether it is necessary by using the printhead status plot (see Use the printhead status plot on page 53). ● If banding occurs mostly in black areas, create a new color profile using pure black and not a mixture of other colors. See your RIP documentation. If the problem persists, call your service representative (see the User's guide). Adjust the substrate advance The substrate advance sensor measures the advance of the substrate and compensates for irregularities at every pass of the printheads. However, to fine-tune the quality of your print, you may need to calibrate the rate at which the substrate advances. The substrate advance determines the placement of dots on the substrate. If the substrate is not advanced correctly, light or dark bands appear in the printed image and the grain in the print may increase. You can modify the substrate advance with the Substrate Advance parameter in the RIP's substrate preset. 1. On the front panel, select the icon, then select Image quality maintenance > Substrate advance calibration > Print adjustment plot. The printer prints a substrate-advance adjustment image. 2. The calibration image consists of several columns with a number at the bottom of each one. Locate the lightest of the columns and enter its number into the RIP's Substrate Advance parameter for the current substrate preset. The value chosen in this example should be "-6". Substrate advance adjustment on the fly If you are using no more than six passes, you can fine-tune the substrate advance while printing: select the icon, then select Image quality maintenance > Substrate advance calibration > Adjust substrate advance. Select a value of change from -10 mm/m to +10 mm/m (or mils/inch). To correct light banding, decrease the value. To correct dark banding, increase the value. If you are using eight passes or more, a wrong advance adjustment will not produce banding but graininess, which is harder to assess visually. Therefore, in this case you are recommended to use only the adjustment plot. When you have chosen a value and pressed OK, the rest of your job will be printed with that value, but it will be reset to zero at the end of the job. Add the value found to the Substrate Advance value in the RIP preset to print all future jobs with the new setting. A simpler and faster way to adjust the substrate advance while the printer is printing is by pressing the Move Substrate button on the front panel, which then displays the following instructions. 56 Chapter 6 Troubleshoot print-quality issues ENWW