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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

There are following three methods of scanning documents in this
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.

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.

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.

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 47

+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

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)

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