Oki ML490 Maintenance Manual - Page 81

Range: 1. Press

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No. Item Specification 4-1-1 Gap between the platen and the print head 1) Parallelism justment adVariation of value at the left, the center and the right shall be less than 0.02 mm Drawing Adjustment method It shall be measured at 3 points: the left end, the center and the right end of the platen. Adjustment method After adjustment, mark the adjust composition with a red pen. Left Right Adjust cam (1) Gap between the platen and the print head at the left end and the right end shall be adjusted by rotating the adjust cam. Marking (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. 2) Initial adjustment 0.35±0.03 mm Carriage shaft Platen (3) Adjust the gap by rotating the adjust screw in direction B or C while the adjust lever and the adjust gear are disengaged. Left Center Right (4) After adjustment, mark the adjust cam position with a red pen. Range: 1 Range: 5 Print head Adjust lever Adjust screw Adjust gear Adjust cam 42114101 Rev.1 81 /

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42114101
Rev.1
81 /
After adjustment, mark the adjust
composition with a red pen.
Left
Right
Marking
Adjust cam
Item
No.
Specification
Drawing
Adjustment method
Gap between the plat-
en and the print head
1)
Parallelism
ad-
justment
4–1–1
Variation
of
value at the
left, the center
and the right
shall be less
than 0.02 mm
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.
0.35
±
0.03 mm
2) Initial adjustment
Adjust cam
Print head
Adjust gear
Adjust screw
Adjust lever
Range: 1
Range: 5
Right
Center
Left
Platen
Carriage shaft