HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 84
The printer cannot detect the left edge of the substrate
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Double-sided printing If you are willing to print without using the registration lines, you can set 'Rows to Register=0' within the job properties. The printer will then print without checking the position of the registration lines, which means that you may see misregistration between sides A and B. The printer cannot detect the left edge of the substrate In some cases the printer may not be able to detect the left edge of the substrate. 1. Translucent types of substrate such as backlit cannot be detected. For those types of substrate it is recommended to deselect Side Edge Detection option, refer to the User's Guide. 2. Side A of the substrate is dirty and the printer cannot detect the registration line. 3. Check the Substrate Edge Holders are correctly positioned. Excessive registration error along substrate movement direction Registration errors along the substrate movement direction could occur for the following reasons. 1. The Substrate Advance Calibration has not been performed. Perform the Substrate Advance Calibration before printing Side A and before printing Side B, see the User's Guide for details. 2. There is a big difference between the substrate advance correction applied to Side A and that applied to Side B. 3. When performing the Substrate Advance Calibration it is important to select Side B Calibration space when defining the job, as performing the calibrations (Dynamic Color Registration and Substrate Advance Compensation) on substrate which has been heated will ensure a correct calibration. NOTE: Do not use the Move Substrate option to make space for the calibration, as this will not heat the substrate (as the Side B calibration space option does), and the printer will not calibrate correctly. 4. The distance scanned between the Image Registration Line is too large and is affecting the registration. For the best image registration select 1 in the options Rows to register, this will ensure each registration line is scanned. 5. The Substrate-Advance Sensor is dirty; see Clean the substrate-advance sensor on page 33. 6. See The two sides of a double-sided job are not the same size on page 80. Excessive registration error along carriage movement direction Registration errors along the carriage movement direction could occur for the following reasons. 1. Side edge detection is not enabled. 2. The images are not centered. 78 Chapter 8 Troubleshoot double-sided printing ENWW