To reproduce stable colors with the machine, use pre-output image quality adjustment.
Understand the image adjustment flow (which timing, which image quality adjustment, in what order), and then make adjustment as needed.
If the Intelligent Quality Optimizer IQ-501 is mounted, you can adjust the colors or check if they become closer to the target colors.
Image Quality Adjustment Flow of Image Controller IC-603
Image Quality Adjustment Flow of Image Controller IC-417 or Image Controller IC-313
Screen Selection (Adjustment Flow When Changing the Screen)
Density Balance Adjustment (Adjustment Flow When Changing the Screen)
Maximum Density Adjustment (Regular Adjustment Flow (High Accuracy))