HP Scitex LX600 HP Scitex LX Printer Family - Maintenance and troubleshooting - Page 50

Substrate issues The substrate is not flat If the substrate does not lie flat when it comes out of the printer, but has shallow waves in it, you are likely to see defects in the printed image, such as vertical stripes. This can happen when you use thin substrate that becomes saturated with ink; it can also be caused by the combination of heat and vacuum pressure that is applied to the substrate. 1. Check that the substrate type you have loaded corresponds to the substrate type selected in the front panel and in your software. 2. If you are using a paper-based substrate, try changing to a thicker substrate. There are wrinkles in the substrate Wrinkles in the substrate indicate that the substrate settings that control the substrate shape are not optimized. This can cause various printing defects. ● Colored bands in area fills in the vicinity of the wrinkles ● Ink smears if the printhead touches the substrate ● A substrate crash if the printhead's movement over the substrate is impeded There are various reasons why wrinkles could appear while printing: ● Incorrect loading of the substrate ● Incorrect routing of the substrate through the printer ● Incorrectly positioned edge holders ● Drying and curing temperatures too high for the substrate ● Differential expansion of the substrate due to variations in temperature, perhaps caused by a large difference between drying and curing temperatures ● Insufficient tension or non-uniform tension across the substrate If your prints suffer from wrinkles, here are some suggestions. 1. Check that the substrate you are using is the same type that you have selected in the HP Internal Print Server. 2. Try to minimize skew while loading the substrate. 44 Chapter 6 Troubleshoot substrate issues ENWW