Service manual

WRITE UNIT
2-D-1
2 UNIT EXPLANATION
WRITE UNIT
[1] Composition
[2] Mechanisms
*1 Path of laser light
The light output from semiconductor laser is radi-
ated onto the OPC drum via the collimator lens,
compression prism, fine adjustment prism, beam
combining prism, cylindrical lens 1, polygon mir-
ror, fθ lens 1, fθ lens 2, second mirror, cylindrical
lens 2, and third mirror.
Index sensor board
2nd mirror
fθ lens 2
fθ lens 1
Collimator lens unit 1
Laser driver board LD1
Beam combining prism
Collimator lens unit 2
Laser driver board LD2
3rd mirror
Cylindrical lens 2
Polygon mirror
Cylindrical lens 1
Mechanism Method
*1 Scan Polygon mirror
Rotational speed:
24,803.1 rpm (400 dpi)
37,204.7 rpm (600 dpi)
Light source Laser diodes (two)
(Output: Max. 20 mW)
*2 Positioning Index sensor
Fine adjustment prism
*3 Laser beam
combining
Beam combining prism
Semiconductor
laser LD2
CY2 lens
3rd mirror
Polygon
mirror
Glass cover
Index mirror
Index sensor
fθ lens 1
fθ lens 2
2nd mirror
CY1 lens
Beam
combining
prism
Collimator
lens unit
Semicon-
ductor
laser LD1
Compression prism
OPC drum
Polygon Cooling Fan
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