service manual ar-203e ar-203e x ar-m200 ar-m201 model ar-5420
service manual ar-203e ar-203e x ar-m200 ar-m201 model ar-5420
service manual ar-203e ar-203e x ar-m200 ar-m201 model ar-5420
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3. Laser unit<br />
The image data sent from the MCU (image process circuit) is sent<br />
to the LSU (laser unit), where it is converted into laser beams.<br />
A. Basic structure<br />
The LSU unit is the writing section of the digital optical system.<br />
The semiconductor laser is used as the light source, and images<br />
<strong>ar</strong>e formed on the OPC drum by the polygon mirror and fθ lens, etc.<br />
The laser beams <strong>ar</strong>e passed through the collimator lens, the cylindrical<br />
lens, the polygon mirror, the fθ lens, and the mirror to form<br />
images on the OPC drum in the main scanning direction. The laser<br />
emitting PWB is provided with the APC (auto power control) in<br />
order to eliminate fluctuations in the laser power. The BD PWB<br />
works for measurement of the laser writing st<strong>ar</strong>t point.<br />
6<br />
No Component Function<br />
1 Semiconductor laser Generates laser beams.<br />
2 Collimator lens Converges laser beams in p<strong>ar</strong>allel.<br />
3 Cylinder lens Takes the focus.<br />
4 Polygon mirror, Reflects laser beams at a constant<br />
polygon motor rpm.<br />
5 BD (Lens, PWB) Detects st<strong>ar</strong>t timing of laser<br />
scanning.<br />
6 fθ lens Converges laser beams at a spot on<br />
the drum.<br />
Makes the laser scanning speeds at<br />
both ends of the drum same as each<br />
other. (Refer to the figure below.)<br />
Makes the laser scanning speeds at both ends of the drum same<br />
as each other.<br />
a ≠ b ≠ c<br />
4 3 2 1<br />
a b c<br />
6<br />
fθ LENS<br />
3<br />
d = e = f<br />
d e f<br />
5<br />
B. Laser beam path<br />
C. Composition<br />
AR-203E/<strong>5420</strong>/M200/M201 OPERATIONAL DESCRIPTIONS 7 - 3<br />
Effective scanning width: 216mm (max.)<br />
Resolution: 600dpi<br />
Beam diameter: 75um in the main scanning direction, 80um in the<br />
sub scanning direction<br />
Image surface power: 0.18 ± 0.01mW (Laser wavelength 770 -<br />
795nm)<br />
Polygon motor section: Brushless motor 20.787rpm<br />
No. of mirror surfaces: 5 surfaces<br />
4. Fuser section