HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 20
The Closed-Loop Color Calibration and Ink Restriction Test Chart is printed, which contains scales
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The calibration process is fully automatic and can be performed unattended after you have loaded substrate of the type you wish to calibrate. The process takes about 18 minutes and consists of the following steps. 1. The Closed-Loop Color Calibration and Ink Restriction Test Chart is printed, which contains scales of patches of each ink used in your printer. 2. The test chart is scanned and color-measured using the HP Embedded Spectrophotometer. If the scan cannot be completed successfully, a message is displayed on the front panel; see Color calibration fails on page 87. 3. From the measurements made by the spectrophotometer, the printer calculates the necessary correction tables to apply to your print jobs, for consistent color printing on that substrate type. Calibration should be done in any of the following circumstances: ● Whenever a printhead is replaced ● Whenever a new substrate type is introduced that has not yet been calibrated with the current set of printheads ● Whenever you notice excessive color differences between prints. Such color differences can be caused by aging and wear of the printheads, changes in substrate characteristics between one roll and another, changing environmental conditions and so on. Whenever you replace a printhead, an alert will remind you to perform color calibration, unless you have disabled the alerts. If printhead alignment and/or substrate-advance compensation are also needed, color calibration should always be the last operation. You can check the color calibration status of your substrates with the HP Internal Print Server or the front panel. In the HP Internal Print Server, select Substrate > Color calibration > Show all. Printer calibration 14 Chapter 3 Printer calibration ENWW