Oce CS7400 Series User Manual page 88

Use a printer's loupe or magnifying glass if the patterns are
difficult to see.
Fig. 4-4. Sample head calibration patterns
(1 head per color, six color version shown)
5. Press the  or  control panel keys repeatedly until the
number next to the pattern that is closest to aligned perfectly
is displayed.
For example, if pattern -1 is the closest aligned, press the 
key to change the display to:
X Direction Registration
Head 2: -1
If a printhead is extremely out of alignment, there may be no
pattern in alignment. Since the black vertical bars are five
pixels apart, you can add +5 or -5 to a pattern number to
shift the colored bars up or down by one black bar. Alterna-
tively, you can repeatedly perform the X calibration, which
will move the head in smaller increments, until the head is
aligned.
4-16 Manual Calibrations