HP Latex 2700 User Guide 3 - Page 272

2. Check that you are using the generic substrate presets for the category. The use of incorrect values may result in incorrect substrate behavior. NOTE: Only substrates with high friction along the platen or substrates that easily wrinkle with temperature need high output tension values. Check that your output tension is recommended for your substrate. 3. Check that there is no telescoping of the input roll. 4. If you are using the roll-to-roll configuration with dual-roll spindles and you see smears, or the substrate is not adhering to the platen, mainly at the outer sides of both rolls, you are recommended to use the center support with both spindles. Once installed, you can try to move it up slightly from its calibrated position if you are suffering from wrinkles or the substrate is not adhering to the platen at the outer edges. This could mean that the support has been calibrated below the correct position. Otherwise, you can try to move the support down a bit if you are suffering from wrinkles or the substrate is not adhering to the platen at the inner edges near the center of the printer. This could mean that the support has been calibrated above the correct position. NOTE: Although the center support can be installed while printing, you are recommended to stop the job, unload the substrate, and reload completely, even unwinding the substrate from the output spindle. See Load a roll (dual roll-to-roll configuration) on page 54. 5. Reload the substrate and try to minimize skew while loading. Check that you using the correct loading procedure. 6. Increase the input tension in steps of +5 N/m from the recommended setting for each category until you eliminate the issue. There is skew or telescoping on the output spindle Extreme skew (approximately 10 mm peak to peak) and telescoping in the output spindle while it winds can be caused in three main ways. ● The substrate has not been correctly loaded and aligned during the loading procedure. ● The roll loaded on the input spindle is skewed, and this skew is transferred to the output spindle. ● The roll loaded on the input spindle has been wound with different tensions at its two ends. Printing on rolls that are not wound accurately during manufacturing may lead to wrinkles and skew problems and, generally, this problem can be identified easily because you can see a loss of tension at one side of the substrate between the input roll and the main roller. In that case, see the relevant information provided in the section There are wrinkles and ink smears on the substrate on page 266. NOTE: When printing with dual rolls, you are more likely to notice skew on the output spindle. However, it is not necessarily a problem. If it becomes a problem, proceed in the same way as for a single-roll configuration and consider the use of the recommended center support for dual-roll spindle in both input and output. TIP: If you notice that one of the substrate edges is not as well tensioned as the other between the platen and the main roller, showing a wave-like shape as it enters the platen, then you are likely to have skew, and you should consider the use of the center support for dual-roll spindle in both input and output. There is skew or telescoping on the output spindle 265