DOWNLOAD Sharp AR-M351U / AR-M451U (serv.man11) Service Manual ↓ Size: 1.78 MB | Pages: 17 in PDF or view online for FREE

AR-M351U/M451U, AR-M355U/M455U  MAINTENANCE AND DETAILS OF EACH SECTION  7 - 9

1) Remove the drum cartridge.

2) Check to confirm that the cleaning unit is inserted fully to the

bottom. 

3) Remove the pawl, and remove the MC unit. 

∗

For cleaning the MC unit (charging plate), reciprocate the clean-
ing unit back and forth 3 times or more.

1) Remove the drum cartridge.

2) Loosen the screw, and remove the drum boss mounting plate.

3) Remove the drum, and remove the DSD collar.

∗

When removing the drum, place the drum cartridge as shown in
the figure and remove the drum.

∗

When replacing the OPC drum, clear the following counters.

• Drum rotating time

• Drum counter

∗

When installing a new drum, apply starting powder.

∗

When installing, install the DSD collar R to the drum frame, then
install the drum and the DSD collar F. When installing the DSD
collar, engage the DSD collar boss with the drum frame hole.

1) Remove the drum cartridge.

2) Remove the screw, and remove the drum separation pawl

unit.

∗

When handling the separation pawl, be careful not to break or
scratch the tip of the separation pawl and keep it away from dirt. 

After installing the drum separation pawl unit, push the separation
lever and check to confirm that the separation pawl operates nor-
mally.

1) Remove the drum cartridge.

2) Remove the drum and the DSD collar.

3) Remove the drum separation pawl unit.

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

∗

When installing the toner reception seal, tighten the screw (a)
on the positioning side for the first time. Check to confirm that
the process earth plate and the toner reception seal are conduc-
tive. (10

Ω

 or less)

(a)

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