Oki ML420 Maintenance Manual page 80

No. Item
4–1–1 Gap between the plat-
en and the print head
1) Parallelism
justment
2) Initial adjustment
Carriage shaft
Range : 1
Range : 5
Adjust lever
42113901TH01 Rev.3
Specification
ad-
Variation of
value at the
left, the center
and the right
shall be less
than 0.02 mm
Marking
0.35±0.03 mm
Left Center
Adjust screw
Adjust gear
Drawing
After adjust, mark the adjust
composition with a red pen.
Left
Right
Adjust cam
Platen
Right
Print head
Adjust cam
Oki Data CONFIDENTIAL
Adjustment method
It shall be measured
at 3 points: the left
end, the center and
the right end of the
platen.
Adjustment method
(1) Gap between the
platen and the
print head at the
left end and the
right end shall be
adjusted by rota-
ting the adjust
cam.
(2) Set the adjust
lever at the
Range: 1. Press
the adjust gear
downward (in
direction A) to
push the adjust
gear and the
adjust gear out of
mesh.
(3) Adjust the gap by
rotating the adjust
screw in direction
B or C while the
adjust lever and
the adjust gear
are disengaged.
(4) After adjustment,
mark the adjust
cam position with
a red pen.
80 /