Read Sharp AR-M550 (serv.man4) Service Manual online
: Feb. 6 2004
1
AR-M550/M620/M700 DETAILS OF EACH SECTION 6 - 61
C. Operational descriptions
[Laser optical path]
∗
This unit must not be disassembled in the market.
(1) Polygon mirror motor
The number of mirror surfaces and the motor RPM are reduced to
reduce noises and increase reliability.
reduce noises and increase reliability.
(2) Outline of LSU specifications
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.
No.
Name
Code, signal name
Function
RW
Control signal
+5VLD
5V power for laser diode
RW
Control signal
/READY
Polygon mirror motor READY signal ("L" in the constant speed rotation)
RW
Control signal
/PMCLK
Clock signal for driving the polygon mirror motor
RW
Control signal
/START
Polygon mirror motor drive start signal
RW
Control signal
/VIDEO
VIDEO (Image signal)
RW
Control signal
/SYNC
Sync signal (SYNC) from BD, sync signal for 1 line
No.
Name
Function
Model
Number of
mirror surfaces
Rotation
speed
Bearing
Remark
AR-M550N/U,
AR-M620N/U
AR-M620N/U
14 surfaces
34000rpm
AIR
Superior in
silence
silence
AR-M700N/U
14 surfaces
40000rpm
AIR
1
1
Effective scan width:
297mm
Resolution:
600dpi
Beam diameter:
Main scan = 60 - 85
µ
m
Sub scan = 75 - 110
µ
m
Laser power:
0.385±0.04mW (AR-M550N/U, AR-M620N/U)
0.480±0.04mW (AR-M700N/U)
0.480±0.04mW (AR-M700N/U)
LD wave length:
770 - 795nm
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