DOWNLOAD Sharp AR-M351U / AR-M451U (serv.man14) Service Manual ↓ Size: 2.37 MB | Pages: 23 in PDF or view online for FREE

Model
AR-M351U AR-M451U (serv.man14)
Pages
23
Size
2.37 MB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Maintenance details of following sections, 5-Laser Scanner, 6-Scanner, 7-DSPF, 8-Operation Panel
File
ar-m351u-ar-m451u-sm14.pdf
Date

Sharp AR-M351U / AR-M451U (serv.man14) Service Manual ▷ View online

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 47
B. Major parts and signal functions
+5V2
MHPS
2
GND2
1
3
S3B-PH-K-S
BL
GY
LB
GND2
53053-0310(MOLEX)
+5V2
3
1
2
MHPS
CN11
/MIMB
MIMB
/MIMA
3
MIM
4
S5B-PH-K-S
1
5
CN2
2
MIMA
+24V3
SLD5S-1
CN2
1
5
2
3
4
GND2
GND2
+24V3
+24V3
/CL1
3
4
2
1
5
SLD5R-1
CL1
/CL1
GND2
GND2
+24V3
+24V3
CN1
CN1
IL-FPR-40S-VF-E1500
CN1
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
TX25-100P-LT-H1
CN3
CLK_CCD1
ADD_CCD1
TXD_CCD1
RXD_CCD1
RES_CCD1
GND2
CCD PWB
SCN
JNT
PWB
+3.3V3
+5VCCD
+5VCCD
+5VCCD
GND2
+10VCCD
+10VCCD
1
2
3
4
5
6
7
8
9
10
37
38
39
40
32
33
34
35
36
1_CLK+
1_CLK-
1_DATA0-
/1_DBL+
/1_DBL-
PAGE1
1_DATA1+
1_DATA1-
GND2
GND2
GND2
FRM_CCD1
+3.3V3
GND2
+5VCCD
+5VCCD
+5VCCD
+5VCCD
+5VCCD
GND2
GND2
GND2
GND2
GND2
GND2
GND2
SCN
cnt
PWB
(1/3)
(1/2)
TX24-100R-LT-H1
1_DATA0+
MHPS
1
11
4
5
10
3
2
6
10
4
9
3
5
6
1
7
8
11
12
Code
Signal name
Name
Function/Operation
Type
Note
MIM
MIM
Scanner (reading) motor
Drives the scanner (reading) section. 
Stepping motor
MHPS
MHPS
Scanner home position 
sensor detector
Scanner home position detection
Transmission type
Sensor
CL1
CL1
Copy lamp
Document exposure lamp
CCD PWB
CCD PWB
Front document image scan (Document table/
SPF mode)
Converts the document images (optical 
signals) into electrical signals.
AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 48
C. Operational descriptions
(1) CCD/lens unit
This machine employs the reduction optical-type line CCD (Charge Coupled Device) of scan resolution of 600dpi and 7450 pixels.
CCD scan is performed by shifting the scan positions sequentially by the carriage unit (lamp and mirror) scan or moving the document with
the SPF.
Lights reflected by the document are reflected by each mirror to form images on CCD elements through the reduction-type lens. The CCD
converts the optical energy into electrical energy (analog). (Photoelectric conversion)
(2) CIS unit
The image sensor which scans back document images is attached to the SPF. The close-contact type image sensor (Contact Image Sen-
sor) with scan resolution of 600dpi and 7196 pixels is employed.
For the CIS to scan documents, the scan position is sequentially shifted by shifting the document by the SPF, and the LED light in the unit
is radiated to the back of the document, and photo energy is converted into electric energy (analog signal).
No.
Name
Function
1
Copy lamp unit
Lights up to radiate documents. A xenon lamp (operating on 3.15KV) is employed.
2
Reflector
This mirror converges lights on documents. 
3
No. 1 mirror
Secures the optical path between a document and No. 2 mirror. 
4
No. 2 mirror
Secures the optical path between No. 1 mirror and No. 3 mirror.
5
No. 3 mirror
Secures the optical path between No. 2 mirror and the CCD. 
6
CCD/Lens unit
The reduction optical type CCD (Charge Coupled Device) of 7,450 pixels is employed. The scan resolution 
is 600dpi. Converts photo energy reflected by the mirrors into electric energy.
7
White balance sheet
Serves as the reference sheet of white for scanning with the CCD/Lens unit. If dust or dirt is attached to 
this sheet, white streaks may be produced.
8
Table glass
A document is set on this glass. The glass surface is coated for protection against static electricity. 
A document is set to the top left corner. 
9
SPF scan glass
The copy lamp unit is fixed, and a document is moved over this glass to scan line by line. The glass 
surface is coated for protection against static electricity. If dust or dirt is attached to this sheet, black 
streaks may be produced.
10
Mirror home position 
sensor (MHPS)
Detects the home position of the mirror base unit.
11
Scan motor
Drives the mirror base and the copy lamp unit.
12
DSPF white balance 
sheet
Serves as the reference sheet of white for scanning with the CIS unit.
 If dust or dirt is attached to this sheet, white streaks may be produced. 
Lens center line
Focus point
LED PWB
CIS
CIS UNI
Auto-focus lens
Glass
AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 49
(3) Image signal flow
The image signal converted into electric energy (analog signal) is
A-D converted on the CCD PWB. Image processes such as white
balance and shading correction are performed on the scanner
control PWB. The image signal is then sent through the mother
board to the MFP control PWB.
In the MFP control PWB, image process is performed according to
the setting content of the operation panel. The image data are
converted into laser lighting signals (VIDEO signals), and sent
through the mother PWB and the PCU to the LSU (Laser Scan
Unit). 
In the LSU, the VIDEO signals are converted into laser beams,
which are radiated onto the drum.
(4) Carriage (lamp unit) shift (scan) speed
The carriage scan speed depends on the copy magnification ratio. 
Speed up to 171% = 110mm/s
Speed of 172% - 400% = 55mm/s
(5) Timing chart
Platen timing chart
SPF duplex timing chart
PSW
CCD
MHPS
MIMD
MM
Feed
Return
Home position
Home position
Scan
CCD
SPOD
CIS
SPPD4
SRRC
SPFM
1030mS
181mS
55mS
94mS
AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 50
D. Maintenance and parts replacement
(1) Maintenance list
(2) Maintenance and parts replacement
Unit name
Part name
When 
calling
100K 200K 300K 400K 500K 600K 700K 800K
Remark
Scanner 
section
Mirror/Lens/Reflector/Sensors
Table glass/Dust-proof glass/OC
White reference glass
Rails
Drive belt/Drive wire/Pulley
1
3
4
2
1
1
2
4
5
5
No.
Unit
Parts
a
Scanner unit
1
OC
2
Dust-proof glass
3
Table glass
4
White reference glass
5
Mirror
6
Rails
7
Drive wire
8
Pulley
9
Drive belt
10
Scan motor
11
OC open sensor
12
Mirror home position sensor
13
Scanner control PWB
14
Scanner interface PWB
b
Lamp unit
1
Reflector
2
Mirror
3
Lamp
4
Inverter  PWB
c
CCD lens 
PWB unit
1
CCD lens
a-2
a-10
a-11
a-12
a-14
a-13
a-4
a-5
a-6
b-2
b-1
b
a-7
b-3
b-4
a-8
a-8
a-9
a-7
c
a-1
a-3
c-1
a-6
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