HP Latex 1500 User guide - Page 375

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 Internal Print Server and in your software. 2. If you are using a paper-based substrate, try changing to a thicker substrate, or reduce the amount of ink. A spindle latch suddenly opens during printer operation If a spindle latch is not closed before starting the substrate load, or it is opened by someone after the spindle was already moving or while the substrate was under tension, the spindle can move out of place. Closing the latch in those conditions can cause an incomplete latch engagement, and then at some point the latch may spontaneously open completely. The best solution is to eliminate substrate tension, avoid spindle movement, and then close the latch properly. To do this, return to the substrate load/unload menu, ensure that the spindle is properly in place (in case of doubt, extract it a bit and then push it back fully inside again), then close the latch (the blue part should now go down completely). The substrate advances with a loud continuous sound of vibration A loud continuous sound of vibration during the substrate advance can be caused in the following ways: ● The input spindle is not applying tension. ● Wrong tension or vacuum settings result in an incorrect balance of forces on the main roller. If you hear this sound, here are some suggestions: 1. Check that the substrate you are using is the same as the one you have selected in the Internal Print Server. 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. ENWW The substrate is not flat 367