Oce CS7075 User Manual page 113

Use a printer's loupe or magnifying glass if the patterns are
difficult to see.
Fig. 4-3. Sample head calibration patterns
5. Press the  or  control panel keys repeatedly until the num-
ber 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. Alter-
natively, you can repeatedly perform the X calibration,
which will move the head in smaller increments, until the
head is aligned.
Manual Calibrations 4-13