Oki B 2400 - Manual (Page 63)

Repair Information 4-3
24xx
8. Using a feeler gauge [1], slowly adjust the left gap adjust
bushing [2] counterclockwise, until a gap of (within 0.33 and
0.37 mm) exists between the printhead [3] and the platen.
9. Move the printhead to the right edge of the rubber on the platen
and using a feeler gauge [1], slowly adjust the right gap adjust
bushing [2] clockwise, until a gap of (within 0.33 and 0.37 mm)
exists between the printhead [3] and the platen.
10. After adjusting both left and right gap adjust bushings, push the
printhead to the center of the platen and verify a gap of within
(0.33 and 0.37 mm) exists between the printhead and the
platen.