Xerox DocuColor 2045 - Manual (Page 39)

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Check Gradation
The Check Gradation feature allows you to print gradated color patch prints for
each line screen on the digital press. These gradated color patch prints are used
to verify that the dry ink/toner densities for CMYK and Grey balance are correct.
If you are dissatisfied with the appearance of any color on the print, you can
manually adjust the dry ink/toner densities for Cyan, Magenta, Yellow, and Black
using the Manual Adjust feature. It is recommended that you begin your
calibration by calibrating the 300 PG screen first. This is the basic line screen
that is used, and all other line screens are calibrated against the 300 PG screen.
Use this feature daily and compare the output of gradated color patches to the
color patch prints from the previous day. Under normal operating conditions,
there should be no difference between them. Automatic sensors and control
mechanisms in the digital press with scanner should maintain consistent
calibration.
If there is an obvious visual difference between two days’ color patches, run the
calibration process on the Raster Image Processor, then run this gradation
process again.