Laser Optical Path; Polygon Motor; Outline Of Lsu Specifications - Sharp AR-M455N Service Manual

No. Name
1 Laser control PWB
2 Cylindrical lens
3 Incidence reflection mirror
4 No. 1 mirror
5 fθ lens 1
6 fθ lens 2
7 BD PWB
8 No. 2 mirror
9 Plane lens
10 Convergence lens for BD
C. Operational descriptions

[Laser optical path]

∗ The LSU must not be disassembled in the market.

(1) Polygon motor

Number
Model RPM
of mirrors
31/35PPM 14 17000RPM
45PPM 14 22000RPM

(2) Outline of LSU specifications

Effective scan width: 297mm
Resolution: 600dpi
Main scan = 60 - 85 µm
Beam diameter:
Sub scan = 75 - 110 µm
Laser power: 0.23±0.01mW (45 PPM)
0.19±0.01mW (35 PPM)
LD wave length: 770 - 795nm
D. Maintenance and parts replacement
No. Unit
a 1 LSU
a-1
AR-M355N/M455N MAINTENANCE AND DETAILS OF EACH SECTION 7 - 44
Controls laser beam flashing and the output value.
Converges laser beams to focus.
Assures the optical path for laser beams.
Assures the optical path for laser beams.
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.
Detects the timing of laser scan start. This device is used to detect a laser trouble.
Converges laser beams to focus.
Assures the optical path for laser beams.
Converges laser beams onto the BD PWB.
Bearing
OIL Superior in
silence.
OIL
Parts
Function
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.