Read Sharp AR-M351U / AR-M451U (serv.man14) Service Manual online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 44
C. Operational descriptions
[Laser optical path]
∗
The LSU must not be disassembled in the market.
(1) Polygon motor
(2) Outline of LSU specifications
D. Maintenance and parts replacement
a-1. LSU
1) Remove the screw, and remove the right cabinet.
2) Remove the screw, and remove the right noise cover.
3) Remove the connector, and remove the screw.
No.
Name
Function
1
Laser control PWB
Controls laser beam flashing and the output value.
2
Cylindrical lens
Converges laser beams to focus.
3
Incidence reflection mirror
Assures the optical path for laser beams.
4
No. 1 mirror
Assures the optical path for laser beams.
5
f
θ
lens 1
Deflects laser beams so that the laser scan speeds on the both ends of the drum and that at the
center of the drum are the same.
center of the drum are the same.
6
f
θ
lens 2
7
BD PWB
Detects the timing of laser scan start. This device is used to detect a laser trouble.
8
No. 2 mirror
Converges laser beams to focus.
9
Plane lens
Assures the optical path for laser beams.
10
Convergence lens for BD
Converges laser beams onto the BD PWB.
Model
Number
of mirrors
RPM
Bearing
31/35PPM
14
17000RPM
OIL
Superior in
silence.
silence.
45PPM
14
22000RPM
OIL
Effective scan width:
297mm
Resolution:
600dpi
Beam diameter:
Main scan = 60 - 85
µ
m
Sub scan = 75 - 110
µ
m
Laser power:
0.23±0.01mW (45 PPM)
0.19±0.01mW (35 PPM)
0.19±0.01mW (35 PPM)
LD wave length:
770 - 795nm
No.
Unit
Parts
a
1
LSU
a-1
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