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 - 53
b-1. Reflector
b-1. Mirror
1) Remove the table glass. 
2) Clean the reflector and the mirror.
b-3. Lamp
1) Remove the table glass.
2) Slide the lamp unit base to the notch section. 
3) Flip the notch section Mylar and remove the screw. Slide the
lamp holder to the front side, and remove it upward from the
rear side. Remove the connector.
b-4. Inverter PWB
1) Remove the table glass.
2) Hold with your hand and remove the screw. Remove the con-
nector and remove the inverter PWB.
c. CCD lens PWB unit
1) Remove the table glass. 
2) Remove the dark-box cover.
3) Remove the CCD lens PWB unit.
Note: The CCD lens PWB unit is factory-adjusted before
shipping. 
Since these adjustments cannot be performed in the
market.
Never touch the screws other than screw 2) of the CCD
lens PWB unit. 
1)
1)
1)
1)
1)
2)
2)
3)
1)
AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 54
c-1. CCD lens
1) Remove the table glass.
2) Remove the dark-box cover.
3) Remove the lens cover.
4) Clean the CCD lens and the CCD. 
7. DSPF section
A. General
Sheet documents are automatically fed and transported for contin-
uous scanning.
The DSPF (AR-EF3) supports duplex sheet to scan both of the
front and the back surfaces at a time.
Note for CCD lens PWB unit installation 
<1> Adjust the CCD unit adjustment value listed in the table
below with the scribed line on the lens base.
<2> Make a sample copy at the above position, and measure 
the magnification ratio. 
<3> Change the installing position in the horizontal direction to 
adjust the magnification ratio.
• When the copy image is longer than the original, shift to the
positive (+) direction.
• When the copy image is shorter than the original, shift to the
negative (-) direction. 
1 scale of the scribed line corresponds to 0.3% of magnifica-
tion ratio. 
If this adjustment is not satisfactory, make a fine adjustment 
with SIM 48-1.
(Refer to the adjustment described below.)
CCD adjustment value
+4 scales
5.0~
+3 scales
3.6~4.9
+2 scales
2.2~3.5
+1 scale
0.8~2.1
Reference
-0.6~0.7
-1 scale
-2.0~ -0.7
-2 scales
-3.4~ -2.1
-3 scales
-4.8~ -3.5
-4 scales
~ -4.9
CCD unit adjustment value
(+) direction 
Reference line
(-) direction
1 scale: 1.4mm
AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 55
B. Major parts and signal functions
SCN
cnt
PWB
SPF
PWB
1
+24V3
CND
B
B6B-PH-K-S
2
3
/B
5
4
6
+24V3
/A
A
VAREF
+5V2
4
B12B-PHDSS-B
GND2
GND2
5
2
6
GND2
7
3
SPLS1
SPWS
+5V2
CNA
1
9
SPLS2
10
SRA-01T-3.2
2
1
+5V
3
B22B-PHDSS-B
CNB
GND2
5
7
4
SPED
8
9
10
14
15
16
12
18
22
20
+5V2
SCOV
GND2
+5V2
SPPD
GND2
+24V3
/SDSS
+5VPOD
SPOD
GND2
11
12
+24V3
/SPFS
GND2
1
1754873+179228-3
GND2
+5V2
1754873+179228-3
1
2
SPLS1
SPLS2
3
+5V2
3
2
GY
FG
SRA-21T-3
GY
GY
SRA-21T-3
11
/SDSS
2
1
1 +24V3
2
SPPD
GND2
+5V2
2
1754873+179228-3
3
1
SPED
GND2
+5V1
GND2
+5V2
SCOV
+5V2
GND2
SPPD
+24V3
/SDSS
PHNR-11-H+BU11P-TR-P-H
2
B3B-PH-K-S
3
1
3
2
1
PHNR-3-H+BU3P-TR-P-H
2
1
PHNR-2-H+BU2P-TR-P-H
/SRRC
+24V3
+24V3
/SPFC
+5VPOD
SPOD
GND2
(NC)
1
2
3
4
5
6
7
8
9
10
11
6
5
4
8
9
10
11
7
3
2
1
1
3
2
1754873+179228-3
GND2
+5V1
SPED
1
SCOV
3
1754873+179228-3
2
+5V2
GND2
SMP-02V-NC+SMR-02V-N
3
2
1
2
1
+24V3
/SPFC
+24V3
/SRRC
(NC)
PHNR-6-H+BU6P-TR-P-H
1
3
1754873+179228-3
2
+5V2
GND2
SOCD
+5V2
SOCD
GND2
6
19
13
17
21
1
3
VAREF
3
SPWS
2
GND2
1
SMR-03V-NC+SMP-03V-N
2
1
1
PHNR-2-H+BU2P-TR-P-H
2
2
+24V3
SOCD
SPOD
5
1
6
2
+5V2
3
6
+5VPOD
3
4
2
GND2
GND2
4
1
5
/SPFS
PHNR-6-H+BU6P-TR-P-H
+24V3
B
5
1
6
2
A
3
6
/B
3
4
2
/A
+24V3
4
1
5
2_DATA0+
2_CLK-
2_CLK+
RXD_CCD2
TXD_CCD2
CIS
cnt
PWB
CLK_CCD2
FRM_CCD2
B26B-PHDSS
9
1
20
24
18
7
17
15
10
21
23
25
5
26
13
4
19
6
8
12
11
14
2
16
22
3
CN1
2_DBL+
1
2
3
4
5
6
7
8
9
2_DBL+
/CIS_SET
9604S-35F
17
16
18
20
19
15
SCN
LGATE
CLK
2_DATA0+
2_CLK-
2_CLK+
DGND
DGND
VAS
GND2
GND2
SCLK
DGND
SD0
DGND
DGND
/LST
VLED
+5V2
DGND
DGND
DATA
DGND
DGND
2_DATA1-
/CIS_SET
25
26
+3.3V
2_DBL-
LD
SD1
VDS
DGND
DGND
CN3
1
2
3
4
5
6
GND2
ADD_CCD2
RES_CCD2
GND2
CN7
+3.3V
S26B-PHDSS
2_DATA1+
2_DATA0-
7
35
34
33
32
31
30
29
28
27
26
25
24
23
22
14
13
12
+12V1
11
10
9
8
GND2
GND2
+5V2
+12V1
FRM_CCD2
GND2
PAGE2
SD2
20
24
18
17
15
10
21
23
13
PAGE2
+24V3
RXD_CCD2
TXD_CCD2
CLK_CCD2
+3.3V
21
2_DBL-
DGND
+24V3
ADD_CCD2
RES_CCD2
+5V2
+5V2
+3.3V
DGND
SD3
DGND
SD4
DGND
SD5
DGND
SD6
DGND
SD7
19
12
11
14
16
22
GND2
8
7
a
b
c
SPFSET
SPWS
SPFMB
+24V3
VAREF
SDSS
SRRC
6
SPPD
GND2
5
4
3
1
+5V2
27
28
SPOD
SOCD
SPED
SPLS1
/SPFMA
SPFMA
SPFC
SCOV
SPFMO0
2
SPFS
SPLS2
GND2
/SPFMB
+5V1
GND2
+24V3
GND2
GND2
16
10
17
24
9
8
7
S28B-PHDSS
23
14
15
22
19
13
21
11
20
12
18
CN10
26
25
B26B-PHDSS-B
CNC
3
SPPD
/SPFMB
GND2
9
24
SPED
SOCD
SPFC
SPFMA
/SPFMA
SPLS1
SPFMB
SPWS
SPFSET
25
26
SPFMO0
SCOV
SPLS2
SPOD
1
2
16
18
12
20
11
21
13
19
22
15
14
23
SRRC
SDSS
VAREF
SPFS
GND2
17
10
4
+5V2
GND2
GND2
5
6
+24V3
+24V3
2_DATA1+
2_DATA1-
2_DATA0-
CN6
GND2
/STSET
/STMPS
+24V3
4
2
1
3
179228-4+175694-4
BR
RD
GY
LB
4
3
2
1
B4B-PH-K-S
/STSET
GND2
/STMPS
+24V3
CN1
TX25-100P-LT-H1
CN3
SCN
JNT
PWB
(1/2)
TX24-100R-LT-H1
SCOV
SPLS2
SPLS1
SDSS
SPPD
SPOD
SOCD
SPED
SPFC
SRRC
OCSW
SPFVR
SPFS
CIS unit
STMP
SPFM
10
8
3
4
5
7
2
11
12
9
1
AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 56
C. Operational descriptions
(1) Document feed, transport, scan, paper exit, and 
operating speed
The document fed by the take-up roller is sent through the paper
feed roller and the transport roller to the resist roller section.
In the resist roller section, the document lead edge and the scan
start position are synchronized. The document is transported to
the scan section. After being scanned, the document discharged
to the document exit tray by the paper exit roller.
The document transport speed varies depending on the scan
mode and the scan magnification ratio as shown below. 
1
2
5
7
8
10
12
3
4
6
9
11
Code
Signal 
name
Name
Function/Operation
Type
Note
SCOV
SCOV
SPF cover switch
SPF cover open/close detection
Transmission type
Sensor
SPFM
SPFM1
SPF paper feed motor, paper 
transport motor
Drives the paper feed roller and the 
transport roller. (SPF)
Stepping motor
SPFC
SPFC
SPF paper feed clutch
SPF paper feed section roller ON/OFF 
control
Electromagnetic clutch
SRRC
SRRC
SPF resist roller clutch
SPF resist roller ON/OFF control
Electromagnetic clutch
SPED
SPED
SPF document set detector
SPF document presence detection
Transmission type
Sensor
SPPD
SPPD
SPF document paper pass detector SPF document paper pass detection 1
Transmission type
Sensor
SPFS
SPFS
SPF document pickup solenoid
SPF document pickup
Solenoid
STMP
STMP
FAX finish stamp solenoid
Drives the FAX document finish stamp.
Solenoid
SPLS1
SPLS1
SPF document length detector 1
SPF document length detection (Short)
Transmission type
Sensor
SPLS2
SPLS2
SPF document length detector 2
SPF document length detection (Long)
Transmission type
Sensor
SPFVR
SPFVR
SPF document size (Width) 
detection analog data detector
SPF document size (Width) detection
Volume resistor
Other 
detector
SOCD
SOCD
SPF open/close detector
SPF unit open/close detection
Transmission type
Sensor
SPOD
SPOD
SPF paper exit detector
SPF paper exit detection
Transmission type
Sensor
No.
Name
Function
1
CIS unit
 (AR-EF3 only)
This is an image sensor unit to scan the back of a document. An image sensor (CIS: Contact 
Image Sensor) of 7,196 pixels is employed. The scan resolution is 600dppi.LED lights in the 
unit are reflected onto the document. Lights reflected from the document are passed through 
the lens to form images on the photoelectric conversion elements. 
The photo energy is converted into electric energy.
2
Document resist roller
This roller makes synchronization between the document lead edge and the scan start 
position.
3
Document resist front sensor 
(SPPD)
Detects that a document reaches the resist roller. 
4
Document set sensor
Detects that a document is set on the tray.
5
Document feed roller
Feeds documents. 
6
Separation plate
The rubber plate prevents against duplicated feed of documents.
7
Document length sensor 
(SPLS1/SPLS2)
Detects the document length to detect the document size.
8
Document width detection volume
Detects the document width to detect the document guide. 
9
SPF motor
Transports a document in the SPF.
10
Document take-up roller 
Picks up a document and transport it to the document feed roller.  
11
Document exit roller
Discharges a document.
12
Document exit sensor (SPOD)
Detects document exit. 
Scan mode
Magnification ratio
Document 
transport speed
Single surface scan/
Duplex scan
100% or above
220mm/sec
Single surface scan/
Duplex scan
101% or above
110mm/sec
High image quality 
110mm/sec
FAX
167.1mm/sec
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