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AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 8

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

Transfer belt

—

Transfers toner images on the OPC drum onto paper.

2

Transfer roller

—

Applies a transfer voltage to the transfer belt.

3

Belt cleaning blade

—

Cleans and removes toner from the transfer belt.

4

Transfer discharge sheet

—

Discharges the transfer belt.

5

Transfer belt cleaning roller

—

Removes paper dust from the transfer belt.

6

Transfer belt drive roller

—

Drives the transfer belt.

7

Transfer belt follower roller

—

Transfer drive follower roller

8

Transfer belt cleaning brush

—

Cleans the back surface of the transfer belt.

9

Process control sensor

Monochrome: PCSK
Color: PCSC

Detects the toner patch density in image density correction.

10

Transfer waste toner tank

—

Collects waste toner on the transfer belt.

11

Transfer belt unit

RW

Belt motor

BTM

Drives the transfer belt.

RW

Calibration solenoid

CALS

Drives the shutter on the process control sensor.

RW

Waste toner full detection switch

BTNF

Detects waste toner full in the waste toner box.

RW

Belt lift-up motor

BLUM

Lifts up the transfer belt unit.

RW

Belt lift-up sensor

BLUD

Detects the position of the transfer belt unit.

RW

Control signal

TC (K, C, M, Y)

Each color transfer high voltage control signal

RW

Control signal

THV (K, C, M, Y)

Each color transfer high voltage

5

3

3

9

9

1

10

1

5

3

3

9

9

1

10

1

10

5

5

6

7

8

8

2

3

3

9

9

1

1

10

11

2

4

2

4

2

4

4

7

8

4

2

4

4

2

2

6

8

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 9

The transfer belt drive power is transmitted from the drive motor
(BTM) to the transfer drive roller.

The motor (stepping motor) is driven by the drive signal sent from
the PCU.

According to the high voltage control signal from the PCU, the sig-
nal is converted into a transfer high voltage control signal with the
HV (MC) PWB, and sent to the HV (TC) PWB.

According to each color transfer high voltage control signal, a high
voltage is applied to each transfer roller from the transfer high volt-
age HV (TC) PWB through the connection spring to each transfer
roller.

The process control shutter is provided on the process control
sensor of monochrome (PCSK) and color (PCSC). When the shut-
ter is open (in image density correction and automatic registra-
tion), the toner patch formed on the transfer belt is read by the
process control sensor, and its information is sent to the PCU.

When the shutter is closed, the calibration sheet is read to perform
calibration of the sensor itself.

The shutter operation is controlled by the calibration solenoid
(CALS).

Toner scraped by the belt cleaning blade is transported to the
waste toner box by the belt waste toner transport shaft.

When the waste toner box is full, the rotation load of the waste
toner transport shaft increases to turn on the waste toner full
detection switch with the lever by the torque limiter function.

In color print, the transfer belt is in contact with four OPC drums. In
black and white print, the transfer belt unit moves down so that
only the black OPC drum is in contact with the transfer belt.

This up-and-down movement of the transfer belt is performed by
the lift-up motor (BLUM), the lift-up cam, and the unit position sen-
sor (BLUD).

When the left cabinet is opened for jam process, the rotating
mechanism of the lift-up unit separates all four OPC drums from
the transfer belt.

• Transfer belt position for color print

The four OPC drums are in contact with the transfer belt by rota-
tion of the cam in the transfer lift-up unit.

• Transfer belt position for black print

Only the black OPC drum is in contact with the transfer belt by
rotation of the cam in the transfer lift-up unit.

• Transfer belt position in jam process or replacement of the

transfer belt
When the left cabinet is opened, the transfer lift-up unit moves
down, and the transfer unit moves by 9mm accordingly.

Drive to paadle by blum
Waste toner full detection 

→

 

1000 copies 

→

 without 24g reset

Y

M

C

K

Y

M

C

K

9mm

Y

M

C

K

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 10

✕

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

 

❍

: Clean

 

▲

: Replace

 

∆

: Adjust

 

✩

: Lubricate

 

❏

: Shift position

Unit name

No.

Part name

When 

calling

50K

100K 150K

200K

250K 300K

350K

400K

Remark

Transfer 
section

1

Transfer belt

✕

▲

✕

▲

✕

▲

✕

▲

Replace at 100K or 
within 2 years.

2

Transfer roller

✕

▲

✕

▲

✕

▲

✕

▲

3

Transfer belt cleaning 
blade

✕

▲

✕

▲

✕

▲

✕

▲

Replace at 100K or 
within 2 years.

4

Transfer discharge sheet

✕

❍

✕

❍

✕

❍

✕

❍

5

Transfer belt cleaning 
roller

✕

▲

✕

▲

✕

▲

✕

▲

6

Transfer drive roller

✕

✕

✕

✕

✕

✕

✕

✕

7

Transfer follower roller

✕

✕

✕

✕

✕

✕

✕

✕

8

Transfer cleaning brush

✕

✕

✕

✕

✕

✕

✕

✕

9

Sensors

✕

✕

✕

✕

✕

✕

✕

✕

10

Waste toner tank unit

▲

✕

▲

✕

▲

✕

▲

✕

▲

When waste toner full 
is detected.

11

Transfer belt unit

✕

▲

✕

▲

✕

▲

✕

▲

Replace the unit at 
100K or within 2 years.

5

3

3

9

9

1

10

1

5

3

3

9

9

1

10

1

10

5

5

6

7

8

8

2

3

3

9

9

1

1

10

11

2

4

2

4

2

4

4

7

8

4

2

4

4

2

2

6

8

TX belt clean blade seals.

AR-C172M  DESCRIPTIONS OF EACH SECTION  7 - 11

1) Open the left cabinet, and remove the fusing unit. (Refer to the

section of the fusing unit.)

2) Hold section A of the transfer unit and pull it in the arrow direc-

tion so that you can hold both sides of the unit.

3) Hold both sides B and remove the transfer unit from the

machine.

Note: Be careful not to scratch the surface of the transfer belt.

1) Remove the transfer unit from the machine.

2) Remove the screw, and remove the belt cover gear.

3) Remove the connector, the screw, and the motor.

1) Remove the transfer unit from the machine.

2) Remove the connector and the screw, and remove the belt

drive unit.

3) Remove the spring from the hook section.

4) Remove the hook, and remove the process control shutter.

Cleaning: Clean the calibration sheet. (Wipe with soft, dry
cloth.)

5) Remove the connector and the screws, and remove the pro-

cess control sensor.

A

B

A

A

B

B