Dell 2155cn/cdn Color Laser Printer - Manual (Page 647)

Maintaining Your Printer 645
When the value is not 0, enter the value using the procedure in "Entering
Values."
Slow Scan
On the Chart 2 of the color registration chart, find the medium line within the
range of white area for each color pattern (Y, M, and C). If you find the medium
line, make a note of the value (-9
– +9) indicated by the medium line for each
color.
When the value is 0 for each color, you do not need to adjust the color
registration for the slow scan.
When the value is not 0, enter the value using the procedure in "Entering
Values."