Epson AcuLaser C9100 Reference Manual page 252

4. Press the
Registration Adjustment Sheet.
5. See the color values (Yellow, Magenta, and Cyan) at "Left,"
"Center," and "Right" in Chart A on the printed Color
Registration Adjustment Sheet.
6. Determine where the lines for each color cross through the
vertical white lines, and write the numbers of the
corresponding horizontal bands in the table.
If the value for each color is zero, proceed to step 15.
Otherwise, proceed to step 7 to adjust the color registration.
7. Make sure the LCD panel shows
the
252
Enter button. The printer prints a Color
Enter button.
or , then press