HP Latex 1500 User guide - Page 397

Even if the sensor is working correctly, the substrate may not be navigable, meaning that the substrate-advance sensor cannot see it properly (as in the case of transparent substrates or substrates with very smooth back side). In this case, the substrate-advance sensor disables itself automatically. You are then recommended to adjust the substrate-advance compensation: see Substrate-advance compensation on page 148. For best results, cleaning the substrate-advance sensor is included in the printer's weekly maintenance. Printhead alignment Automatic alignment is recommended. See Automatic alignment procedure on page 137. In case you want to perform manual printhead alignment. Ssee Manual Alignment procedure on page 138. The result of the alignment can be verified with the printhead alignment diagnostics plot. See Printhead alignment diagnostics plot on page 141. Advanced print-quality troubleshooting One of the most important parts of print-quality troubleshooting is to ensure that the printheads are healthy. If the basic print-quality troubleshooting does not solve the problem, here are some further procedures that you can try. See Printhead health troubleshooting on page 408. Print-quality artifacts troubleshooting Troubleshoot print-quality issues as horizontal banding, vertical banding, color misalignment, bleed halo wicking, low gloss haze, color accuracy, local colors variations, color variations when tiling, edge roughness text quality, graininess, phyisical deformations marks and poor curing. Horizontal banding Horizontal banding means that your print suffers from added horizontal lines or bands, in a regular pattern. They can look different depending on the cause. Thin dark lines These are thin dark lines across the entire image with certain frequency, more easily seen in solid area fills. There are two likely causes: ● Printhead alignment. This is a clear contributor to banding. If printheads are not correctly aligned, the misplaced dots could correlate directly with the severity of the banding, by putting more ink in the same place and thus creating darker lines. To check printhead alignment, print the printhead alignment diagnostics plot (see Printhead alignment diagnostics plot on page 141). As a general rule, the biggest contributors to thin-dark-line banding caused by printhead alignment are (in this order): - Inter-color alignment (alignment between different colors) Here are some tips for solving this problem: - If the printhead alignment was done with a different substrate of different thickness, probably a new printhead alignment is needed. - Fine-tune the alignment by identifiying the offenders in the printhead alignment diagnostics plot. See Automatic alignment procedure on page 137. ● Substrate advance. Before trying to adjust any parameter, make the following checks: ENWW Advanced print-quality troubleshooting 389