Read Sharp AR-M351U / AR-M451U (serv.man14) Service Manual online
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 43
5. Laser scanner section
A. General
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.
mother board and PCU are converted into laser beams to radiate
onto the drum surface.
B. Major parts and signal functions
PCU
PWB
MOTHER
BOARD
PWB
MFP
CONTROL
PWB
CN2
CN2
CN1
26
GND
13
BUR_PR
MSW_MON
10
19
GND
16
25
DTR_PCU
22
28
9
RES_PCU
15
GND
DSR_PCU
12
21 RXD_PCU
18
27
GND
24
30
DTEN
GND
11 GND2
GND
8
17
HSYNC
TXD_PCU
14
23
POF
20
29
VIDEO1
VIDEO0
GND
SLD30R-1
+12V2
PCU_VCCW
5
7
6
3
+5V1
+5V2
+5V2
+5V2
+5V2
LSU
GND2
8
+24V1
+24V1
PMCLK\
START\
GND2
S11B-PH-K-S
CN2
CN1
VFM1\
1 GND2
+24V1
1
3
2
3
2
PHNR-03-H+BU03P-TR-P-H
PMCLK
3 START\
READY
PHR-5
1
2
5
4 GND2
+24V1
VFM1
+24V1
VFM1\
GND2
VFM1\
+5V2
GND2
4
2
GND2
1
3
S4B-PH-K-S
CN3
SYNC\
GND2
1
2
3
4
SYNC\
GND2
1 GND2
+24V1
3
2
3
2
1
PHNR-03-H+BU03P-TR-P-H
VFM1\
11
1
2
3
4
5
6
7
9
10
RD
RD
RD
BR
BR
BR
BR
BR
GY
GY
GY
RD
RD
BR
BR
GY
GY
VFM1
POWER SOURCE
SECTION
SECTION
B4B-PH-K-S
1
2
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
S32B-PHDSS-B
/VFM1
GND2
VIDEO
LSU_S/H
GND2
/LDON
/VIDEO
/SYNC
GND2
3
4
+5V2
/PMCLK
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
CN16
+5V LD
GND2
23
24
/READY
/START
TEST
25
GND2
S32B-PHDSS-B
/VFM1
26
VRB
GND2
+5V2
GND2
+24V1
+24V1
GND2
GND2
27
28
29
30
31
32
GND2
GND2
GND2
GND2
45 sheets (35 sheets)
/START
/PMCLK
+5V2
GND2
/SYNC
GND2
/VIDEO
/LDON
GND2
+24V1
TEST
VIDEO
GND2
/VFM1
GND2
GND2
+5V LD
GND2
GND2
GND2
GND2
GND2
VRB
GND2
GND2
+24V1
/READY
+5V2
/VFM1
10
9
8
7
6
5
4
READY(READY\)
45 sheets (35 sheets)
+5V2
BD
BR
LB
BL
BR
GY
GY
GY
GY
GY
GY
GY
GY
GY
GY
GY
GY
BR
BR
BR
BR
LBR
BR
BR
BR
BR
BR
BR
BL
BL
BL
RD
RD
3
1
TEST3
TEST2
31
32
2
1
TEST2
TEST3
GY
BR
BR
BR
BR
LSU_S/H
4
2
1
+5V2
+12V1
GND
PM
1
2
6
9
8
7
3
4
10
5
Code
Signal
name
Name
Type
Function/Operation
NOTE
PM
PM
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.
to detect a laser trouble.
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
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.
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.
center of the drum are the same.
6
f
θ
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.
silence.
45PPM
14
22000RPM
OIL
Effective scan width:
297mm
Resolution:
600dpi
Beam diameter:
Main scan = 60 - 85
µ
m
Sub scan = 75 - 110
µ
m
Laser power:
0.23±0.01mW (45 PPM)
0.19±0.01mW (35 PPM)
0.19±0.01mW (35 PPM)
LD wave length:
770 - 795nm
No.
Unit
Parts
a
1
LSU
a-1
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 45
4) Remove the screw, and remove the rear cabinet.
5) Remove the connector, the screw, and the angle. Remove the
snap band.
∗
Do not disconnect the LSU side.
6) Pull out the No. 1 paper feed tray unit, and push up and
remove the front door.
7) Release the lock, and pull out the left door. Remove the
screw, and remove the front cover right.
8) Remove the screw, and remove the main switch mounting
plate.
9) Remove the power unit.
10) Remove the connector and the screw, and remove the duct
holding cover.
11) Remove the screw, and remove the LSU.
AR-M351U/M451U, AR-M355U/M455U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 46
6. Scanner section
A. General
There are following three methods of scanning documents in this
machine.
machine.
a. Place a document on the table glass. The copy lamp unit is
operated to radiate copy lamp light onto the document, scan-
ning the document with the CCD.
ning the document with the CCD.
b. The SPF feeds a document. The copy lamp light is radiated
onto the document which is stopped at the specified position
and the document is scanned by the CCD.
and the document is scanned by the CCD.
c. The SPF feed a document. The LED light of the CIS unit which
is attached to the SPF is radiated to the back of the document,
and the document is scanned by the CIS.
and the document is scanned by the CIS.
