AR-M550 (serv.man12). (6b) Laser scan unit, Image process section, Scanner section, Fusing section, SPF section - Sharp Copying Equipment Service Manual (repair manual). Page 2

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AR-M550/M620  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.
(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
55PPM
14 surfaces
34000rpm
AIR
Superior in silence
62PPM
14 surfaces
34000rpm
AIR
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
LD wave length:
770 - 795nm
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