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AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 10

1) Remove the drum cartridge.

2) Remove the drum and the DSD collar.

3) Pull it out until the cleaning unit stops.

4) Remove the screw, and remove the cleaner blade.

∗

When removing the drum blade, place the drum as shown in the
figure and remove the drum blade to prevent toner from dispers-
ing.

∗

Do not damage the cleaner blade. Do not touch the lead edge.

∗

When installing the cleaner blade, pull the cleaner shaft fully
toward you.

∗

After installing the cleaner blade, insert the cleaner shaft fully to
the bottom.

1) Remove the drum cartridge.

2) Remove the drum and the DSD collar.

3) Remove the toner reception seal.

4) Remove the cleaner blade.

5) Remove the side molt F and R.

∗

When attaching the side molts F/R, attach them to the attach-
ment reference as shown.

∗

After attaching the side molt F/R, push the both ends of the
blade with your fingers to check to confirm that the red moquette
moves smoothly.

Put side seal powder (1g) on the moquettes F/R and spread side
seal powder all over the moquettes surfaces.

Side seal powder: UKOG-0309FCZZ

∗

Do not apply powder excessively to the ambient parts.

∗

Be careful not to damage the cleaning blade and the side blade. 

1) Remove the screw, and remove the rear cabinet.

Reference

Reference

0.3mm

0mm

0mm

0.3mm

Side molt F

0.3mm

Reference

Reference

0mm

0.1mm

0.5mm

(From the blade edge)

0.1mm

Side molt R

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 11

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

PWB unit.

3) Remove the screw and the connector, and remove the sepa-

ration solenoid unit.

4) Remove the E-ring and the screw, and remove the separation

solenoid.

In this section, toner images on the OPC drum are transferred to
paper.

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