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AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 12

DM

8FE-BT-VK-N

DSW-L

DM-T

DM\

5

6

DSW-L

GND1

3

2

1

4

GND1

DMCLK\

(NC)

8

7

PCU PWB

1

2

3

4

5

6

7

8

DM-T

GND2

DM\

CN6

GND2

DSW-F

DSW-F

DMCLK\

9604S-08C

(NC)

1

DVREM\

DHVREM

MHVREM\

THV+PWM\

6

4

13

14

12

GND2

3

7

8

9

10

5

GBPWM\

11

CN15

DSW-F

THin

DHVPWM\

THV-PWM\

THVREM\

2

DVPWM\

9604S-14F

GND2

MHV-T

RD

GR

BL

YL

WH

HV

1

DVREM\

DHVREM

MHVREM\

THV+PWM\

6

4

13

14

12

GND2

3

7

8

9

10

5

GBPWM\

11

DSW-F

THin

DHVPWM\

THV-PWM\

THVREM\

2

DVPWM\

1-84432-4(AMP)

GND2

MHV-T

PS-187

SRA-21T-4L

BIAS

PS-187

PS-187

PS-187

WH

WH

MHV

THV

GB

DHV

DV

RD

PS-187

SRA-21T-3

SRA-21T-4L

RD

SRA-21T-3

2

5

4

3

1

6

3

4

5

Code

Signal 

name

Name

Function/Operation

Type

Note

DM

DM

OPC drum motor

Drives the OPC drum and the transfer section. DC brushless motor

THV

THV

Transfer high voltage

High voltage for transfer

DHV

DHV

High separation voltage

High voltage for separation of paper

No.

Name

Function

1

Transfer roller

Transfers toner images from the OPC drum surface to paper.

2

Discharge plate (Separation electrode)

Separates paper from the drum.

3

TR bearing (F/R)

Transfer roller bearing

4

Transfer roller collar

Transfer roller collar

5

After-transfer star ring

Guides paper after transfer.

6

TR gear

Transfer roller drive gear

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 13

1) Toner image transfer

Toner images formed on the drum by the developing roller are
transferred to paper by the transfer roller.

Toner on the drum is negatively charged by stirring in the
developing unit. By applying a positive voltage to the transfer
roller, the transfer roller and paper on the transfer roller are
positively charged to transfer negatively charged toner images
to paper.

Since paper with toner images transferred on it is positively
charged, a high negative voltage is applied to the separation elec-
trode to separate the paper from the drum.

2) Transfer roller cleaning

After completion of the job, the applied voltage to the transfer
roller is switched to negative in order to attract toner from the
transfer roller to the OPC drum, cleaning the drum with the
cleaning blade.

The transfer cleaning voltage and the developing positive bias are
applied to the OPC drum at the timing shown below so that
remaining toner on the transfer roller is attracted again to the OPC
drum, performing cleaning.

1) When the power is turned on:

∗

However, the cleaning voltage is not applied during warm up
after completion of SIM.

2) After completion of a print job

3) After printing 100 sheets (during 1 job)

200M

-1.8KV

Separation electrode

25   A  45ppm
19   A  31/35ppm
MAX 5KV

-800V

200M

-1.8KV

Separation electrode

25   A  45ppm
19   A  31/35ppm
MAX 5KV

-800V

200M

-1.8KV

Separation electrode

25   A  45ppm
19   A  31/35ppm
MAX 5KV

-800V

CLEANING

READY CONDITION

WARMING UP

PRINTING Job

CLEANING

1sec

PRINTING (100 Sheets)

PRINTING (100 Sheets)

CLEANING

1sec

CLEANING

1sec

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 14

1) Pull out the left door.

2) Remove the transfer lock pawl, and pull out the transfer roller

unit.

1) Remove the transfer roller unit.

2) Remove the transfer rear star ring.

Unit name

No.

Part name

When 

calling

100K

200K

300K

400K

500K

600K

700K

800K

Remark

Transfer

1

Transfer roller

✕

✕

▲

✕

▲

✕

▲

✕

▲

2

Discharge plate

✕

✕

▲

✕

▲

✕

▲

✕

▲

3

TR bearing (F/R)

✕

✕

✕

▲

✕

✕

✕

▲

4

Transfer roller collar

✕

✕

✕

▲

✕

✕

✕

▲

5

After-transfer star ring

✕

✕

✕

✕

✕

✕

✕

✕

6

TR gear

✕

✕

▲

✕

▲

✕

▲

✕

▲

1

3

6

4

2

3

4

5

No.

Unit

Parts

a

Transfer roller unit

1

After-transfer star ring

✕

2

Discharge plate

✕

3

Transfer roller

✕

4

Transfer roller collar

✕

5

TR bearing (F/R)

✕

6

TR gear

✕

a-5

a-2

a-1

a-4

a-5

a-3

a

a-4

a-6

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 15

1) Remove the transfer roller unit.

2) Remove the screw, and remove the discharge plate holder

and the discharge plate.

1) Remove the transfer roller unit.

2) Remove the screw, and remove the discharge plate holder

and the discharge plate.