AS-4000 User’s Guide Troubleshooting If the Color Difference Exceeds the Standard Values when Checking Job Spot Color Accuracy to Compare the Before Printing and After Printing Results Try the following solutions. U “Cleaning the White Calibration Tile” on page 85 U “Cleaning the Backing” on page 74 U “Stirring the Ink Cartridges” on page 102 U “Performing Head Cleaning” on page 102 If the above solutions do not solve the problem, change the substrate. If the Press Cannot Read the Registration Marks If the registration marks on the color measurement chart cannot be read correctly, an error message is displayed. See the following to take action.
U “Setting the Registration Mark Sensor Amplifier Threshold Value” on page 46 To change the width of the color measurement chart Depending on the substrate, the moisture in the ink may cause the substrate to stretch during printing. If the colors differ between the center and the edge of the substrate, color reproduction accuracy will decline. To prevent a decline in color reproduction accuracy, the same number of patches as the substrate width of 250 mm is automatically placed on the color measurement chart, even when the substrate width is 250 mm or more.
Placing as many patches as possible on substrates with a width of 250 mm or more will reduce color measurement time, but may not reproduce the spot colors in the job. When color reproduction accuracy is low, we recommend setting the Color Measurement Chart Width to Auto . This function is effective when printing the following charts. ❏ When creating an ICC profile ❏ When creating calibration data ❏ When performing color matching for spot colors ❏ When checking the color accuracy of the press A Press the Maintenance menu, and then press Press Settings . 99