AR-M700 (serv.man18). Details of each section - 3 Laser scan unit - Sharp Copying Equipment Service Manual (repair manual)

ar-m700 (serv.man18) service manual
Model
AR-M700 (serv.man18)
Pages
3 Few pages! See other manuals at the bottom of the first or last page.
Size
438.94 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Details of each section - 3 Laser scan unit
File
ar-m700-sm18.pdf
Date

Read Sharp AR-M700 (serv.man18) Service Manual online

AR-M550/M620/M700  DETAILS OF EACH SECTION  6 - 60
3. Laser scan unit (LSU)
A. General
This section performs the following operations. 
Image data sent from the MFP (image process circuit) through the
mother board and PCU are converted into laser beams to radiate onto
the drum surface.
B. Major parts and signal functions
Code
Signal 
name
Name
 Type
Function/Operation
MODEL
NOTE
PGM
PGM
Polygon mirror (motor)
Reflects laser beams at the constant rotation speed.
BD
BD PWB
Detects the laser scan start timing. This device is 
used to detect a laser trouble.
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.
6
f
θ
 lens 2
30
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28
27
26
25
24
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1
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1
BD
PGM
GND2
GND2
+5VLD
GND2
/PMCLK
/READY
/START
+24V1
+24V1
GND2
GND2
VRB
GND2
GND2
GND2
GND2
GND2
GND2
GND2
/LDON
LSU S/H
/SYNC
+5V2
+5V2
CN-22
B30B-PHDSS-B
VIDEO
/VIDEO
GND2
GND2
GND2
GND2
GND2
/LDON
LSU S/H
/SYNC
/VIDEO
VIDEO
GND2
SMP-18V-NC/SMR-18V-N
GND2
GND2
+5VLD
GND2
/PMCLK
/READY
/START
+24V1
+24V1
GND2
GND2
VRB
GND2
+5V2
+5V2
LD PWB
GND2
/SYNC
GND2
/PMCLK
/START
GND2
+24V1
/READY
B6B-PH-K-S
B30B-PHDSS-B
GND2
GND2
+5VLD
GND2
/PMCLK
/READY
/START
+24V1
+24V1
GND2
GND2
VRB
GND2
GND2
GND2
GND2
GND2
GND2
GND2
/LDON
/VIDEO
VIDEO
LSU S/H
/SYNC
+5V2
+5V2
+5V2
LSU UNIT
SMP-12V-NC/SMR-12V-N
TEST
TEST
TEST
(NC)
(NC)
TEST2
TEST3
TEST2
TEST3
TEST3
TEST2
/BRAKE
/BRAKE
CN-2
B4B-PH-K-S
PCU PWB
CN-1
CN-3
CN-6
CN-6
CN-8
CN-8
MOTHER
 PWB
MFP 
CONTROL
PWB
1
2
3
4
5
6
8
9
10
7
: 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.
(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
14 surfaces
34000rpm
AIR
Superior in 
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)
LD wave length:
770 - 795nm
1
: Feb. 6 2004
1
AR-M550/M620/M700  DETAILS OF EACH SECTION  6 - 62
D. Maintenance and parts replacement
(1) Maintenance and parts replacement
(List of Replacement Parts)
a. LSU
1) Pull out the multi paper feed tray, and remove the manual paper
feed cover F.
2) Pushing the lower part, remove the right cabinet center.
3) Disconnect the connector, and remove the process cooling fan
unit.
4) Disconnect the connectors to remove the LSU unit.
No.
Unit
Parts
a
LSU
1
a
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Here you can read online and download Sharp AR-M700 (serv.man18) Service Manual in PDF. AR-M700 (serv.man18) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp AR-M700 (serv.man18) Copying Equipment. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.