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AR-C170M  DESCRIPTIONS OF EACH SECTION  7 - 21

1) Remove the drum unit.

2) Remove the drum.

3) Remove the screw, and remove the toner reception seal.

Note: Do not deform the seal.

1) Remove the drum unit.

2) Remove the screw, and remove cover (A).

3) Remove the MC unit.

4) Release the pawl, and remove the MC case upper in the arrow

direction.

5) Release the pawl, and remove the MC case lower in the arrow

direction.

6) Remove the screen grid.

7) Disengage the pawl, and remove the MC cleaner.

1) Remove the rear cabinet.

2) Remove the PCU PWB unit.

3) Remove the developing unit.

4) Remove the drum unit.

5) Remove the top cover, and disconnect the connector of the

ICU.

6) Remove the screw (A) on the rear side, and remove the LED

unit.

7) Remove the LED unit.

8) Remove the connector cover and the harness.

C

K

Y

M

A

A

A

A

AR-C170M  DESCRIPTIONS OF EACH SECTION  7 - 22

This section functions and operates as follows:

1) The copy lamp radiates light onto the document, and the

reflected light is scanned by the three line (RGB) CCD ele-
ment and then converted into image signals (analog).

2) The image signals (analog) are converted into 8bit digital sig-

nals by the A/D converter.

3) The image signals (digital) are sent to the image process sec-

tion (ICU PWB).

MFP PWB

ICU PWB

PCU PWB

CN13 (30pin)

30 29

26 25

28 27

24 23 22

19 18

21 20

17 16 15

12 11

14 13

GND2

REVEN

GND2

GEVEN

GND2

R

ODD

GND2

GODD

GND2

BODD

GND2

BEVEN

GND2

+5V

+12V

+12V

GND2

GND2

+5V

GND2

9

8

10

7

6

5

GND2

CCD_RS

CCD_CP

GND2

CCD_SH

GND2

4

3

2

1

CCD_CLK2

GND2

CCD_CLK1

GND2

CN11 (16pin)

15 16 14

MHPS

GND

+5V

CN8 (5pin)

1

2

5

3

4

GND

GND

+24V

LAMP

+24V

CN14 (4pin)

1

2

3

4

SM A

SM A/

SM B

SM B/

CN12 (24pin)

CN10 (14pin)

CN16 (28pin)

CN16 (28pin)

CN13 (24pin)

CN10 (14pin)

1

2

5

3

4

+24V

+24V

GND

LAMP

GND

Inverter PWB

1

2

3

MHPS

GND2

+5V

MHPS

CL

CCD PWB

CCD lens unit

Scanner motor

Copy lamp unit

AR-C170M  DESCRIPTIONS OF EACH SECTION  7 - 23

RW: Abbreviation of Related Wiring, which means the said load is specified in the related figure of the mechanical and the electrical sec-

tions.

No.

Name

Code, Signal name

Function

1

Scanner motor

SM

Drives the copy lamp unit and the mirror base unit.

2

Pulley belt

—

Transmits drive power of the scanner motor to the pulley.

3

Pulley

—

Drives the scanner drive wire.

4

Scanner drive wire

—

Transmits drive power of the scanner motor to the copy lamp unit 
and the mirror base unit.

5

Scanner unit home position sensor

MHPS

Detects the home position of the copy lamp unit.

7

Copy lamp

CL

Radiates light onto documents. (Xenon lamp)

8

Reflector

—

Converges light from the copy lamp.

9

No. 2 mirror

—

Sends document images to No. 3 mirror.

10

No. 3 mirror

—

Sends document images to the lens.

11

Lens

—

Reduces document images (photo images) and projects them to the 
CCD.

12

CCD PWB

—

Receives the document image (photo signals) and converts them 
into electrical signals.

RW

Inverter PWB

LAMP

Drives the copy lamp (Xenon lamp).

RW

Scanner motor drive

SM A, A’, R, B’

RW

MHPS

MHPS

Scanner home position detect jam

5

4

2

1

3

12

9

10

8

11

7

AR-C170M  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