Oki LP-1040 Maintenance Manual page 585

4.
If the focal point is not aligned (the printout is
light or slightly light), calibrate it with the
following procedure.
(a) With a 7-mm box wrench, loosen the LED
head nut by rotating it counterclockwise
about three turns.
(b) Adjust the focal point by rotating the flat
head screw with the following procedure.
Note
 Rotating clockwise separates the LED head
from the photoconductor drum (rotating to the
counterclockwise brings it closer).
 For every one rotation of the flat head screw,
the LED head moves 0.5 mm (0.0197 inches).
(c) First, rotate the LED head flat head
screws on the left and the right 1/4 of a
rotation in the same direction each to
confirm in which direction the focal point is
shifted.
(d) Next, adjust the focal point by turning the
screws 1/8 of a rotation each time.
(e) Once the focal point is aligned, tighten the
nuts on both sides and secure the
calibration screws (flat head screws).
Slotted screw
Nut
Chapter 10 Printer Calibrationt
Slotted screw
Nut
10-53