Service manual

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.
5fθ 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.
6fθ 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.
45PPM 14 22000RPM OIL
Effective scan width: 297mm
Resolution: 600dpi
Beam diameter: Main scan = 60 - 85 µm
Sub scan = 75 - 110 µm
Laser power: 0.23±0.01mW (45 PPM)
0.19±0.01mW (35 PPM)
LD wave length: 770 - 795nm
No. Unit Parts
a1LSU
a-1