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AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 24

The optical section drive power is transmitted from the drive motor
(SM) through the belt, the drive pulley, and the wire to drive the
copy lamp unit and the mirror base which are attached by the drive
wires.

The drive motor (stepping motor) is controlled by the drive signal
sent from the MFP PWB.

The copy lamp is driven by the copy lamp drive voltage generated
in the inverter PWB according to the control signal sent from the
MFP PWB.

The CCD element, appeared as one unit, but has three separate
rows of CCD elements drive each for (RGB).

Light is radiated to a document by the copy lamp (Xenon lamp),
and the brightness of the reflected light is received by the three
line (RGB) CCD element and converted into (analog) image sig-
nals.

Each color component of RGB is separately extracted from the
document image by the three lines (RGB) of the CCD elements.

The red CCD extracts the red components from the document
image, the green CCD the green components, and the blue CCD
the blue components. This operation is called Color Separation.

The CCD element, appeared as one unit, but has three separate
rows of CCD elements drive each for (RGB).

Scanning of a document in the main scanning direction is per-
formed by the CCD elements. Scanning of a document in the sub
scanning direction is performed by shifting the scanner unit posi-
tion with the scanner motor.

Document images are optically reduced by the lens and projected
to the CCD elements.

The scanning resolution is 600dpi 

×

 600dpi.

(Image data for one line)

1) Each image signal (analog) of RGB is converted into 8bit digi-

tal signal by the A/D converter. Each color pixel has 8bit infor-
mation (256 gradations).

2) Each 8bit digital image signal of RGB is sent to the image pro-

cess section.

Zooming in the sub scanning direction is performed by changing
the scanning speed in the sub scanning direction.

Zooming in the main scanning direction is not performed optically
but by the image process technology (software).

R

G

B

Red component of 
image data

Green component of 
image data

Blue component of 
image data

R

G

B

CCD PWB

CCD ASIC

B A/DC

B

B

Color
3-line

CCD

B analog IC

G analog IC

R analog IC

G A/DC

R A/DC

R

R

G

G

ICU PWB

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 25

✕

: Check (Clean, replace, or adjust as necessary.)

 

❍

: Clean

 

▲

: Replace

 

∆

: Adjust

 

✩

: Lubricate

 

❏

: Shift position

1) Open the upper cabinet rear cover.

2) Remove the connector and the screw, and remove the scan-

ner control PWB unit. Remove the screw and remove the
scanner control PWB (A).

1) Remove the screw, the glass holder right (A), the glass holder

left (B), and the table glass (C).

Unit Name

No.

Part name

When 

calling

50K 100K 150K 200K 250K 300K 350K 400K

Remark

Optical section

1

CCD, mirror, lens, reflector

❍

❍

❍

❍

❍

❍

❍

❍

❍

2

Table glass, sensors, OC

❍

❍

❍

❍

❍

❍

❍

❍

❍

3

SPF glass

❍

❍

❍

❍

❍

❍

❍

❍

❍

4

Rails

✩

✩

✩

✩

✩

✩

✩

✩

✩

5

Drive wire, pulley, pulley belt

✕

✕

✕

✕

✕

✕

✕

✕

✕

4

4

4

5

5

5

4

2

2

1

1

1

1

1

5

5

1

3

A

A

C

B

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 26

2) Remove the screw and the dark box cover (A). Remove the

connector, the screw, and the CCD unit (B).

1) Shift the lamp unit to the position shown below. Loosen the

screw and remove the wire.

2) Rotate the lamp unit and lift it, and remove the harness holder

and the harness. Remove the lamp unit.

1) Remove the lamp unit.

2) Remove the harness and the screw, and remove the Xenon

lamp.

1) Remove the upper cabinet rear unit.

2) Remove the connector and the spring.

3) Remove the screws, and remove the scanner motor unit.

4) Remove the screws, and remove the scanner motor.

B

A

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 27

1) Remove the upper cabinet rear unit.

2) Remove the screw and remove the upper cabinet left.

Remove the screw and the connector, and remove the MHPS.

This model is provided with a cassette paper feed tray and a man-
ual paper feed tray as standard provision.

As an option, either the 3-stage paper feed cassette module (AR-
D18) or the 2-stage duplex paper feed cassette module (AR-D19)
can be installed.

The paper transport section transports paper from each paper
feed port to the PS roller section.

Paper with images transferred on it in the transfer section is
passed to the fusing section, and discharged to the face-up tray or
the face-down tray.