Epson AcuLaser C4000 Owner's Manual page 296

6. The arrow (l) points to the current settings. Check the
patterns indicated by the arrows (l). If the color segment of
the line is in alignment with the black segments on either side
to make one straight line, you do not need to adjust the
registration for that color. If the line segments are not aligned,
adjust the registration as explained below.
Adjusting color registration alignment
1. Make sure the LCD panel displays Ready or Standby, then
press the
2. Press the
displays Setup Menu, then press the
3. Press the
the XXXXRegist item for the color (Cyan, Magenta, and
Yellow) you need to adjust, then press the
For example, to adjust the cyan registration, scroll up to
CyanRegist, then press the
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Maintenance and Transportation
Enter button to access the control panel menus.
Down button several times until the LCD panel
Up button several times until the LCD displays
Enter button.
Enter button.
Enter button.