Ph Unit - Epson AcuLaser C9200N Service Manual

EPSON AcuLaser C9200N

2.2.3 PH Unit

2.2.3.1 Composition
Polygon Motor
Laser Diode
SOS Sensor
OPERATING PRINCIPLES
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PH Unit
4039T2C106AA
4038T2C034AA
Figure 2-4. Composition
Operating Principle of Main Unit Mechanism
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2.2.3.2 Operation
OUTLINE
4 types of the PH Unit are used for exposure process.
The surface of the Photo Conductor is irradiated with a laser light and an
electrostatic latent image is thereby formed.
2 Beam Array LD is used to prevent the rotation speed from increasing
caused by decreasing the number of the sides comparing to Polygon Mirror
which has four sides.
2 Beam Array LD scans in two lines two lasers irradiated by two LD
electrical components set up vertically with one side of Polygon Mirror.
4038T2C008AA
Transfer Belt
SOS Mirror
Beam A
Beam B
PC Drum
G2 Lens
Return Mirror 2
C
Y M K
LD/Y LD/M LD/C LD/K
Laser Diode Surface of the PC Drum
Beam A
Beam B
Polygon
Mirror
G1 Lens
Return Mirror 1
Figure 2-5. Overview
Revision D
2nd Transfer
Roller
PC Drum
Two lines
One scan
Direction
of rotation
of the PC
Drum
4038t2J005AB
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