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AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 2

9) Move the adjustment plate in the arrow direction and adjust.

1) Remove the rear cabinet to allow checking of the high voltage

monitor output pin. 

2) Execute the simulation of the target high voltage. 

(See the table below.)

3) Select the mode to be set with 10-key, and press START key. 

4) Enter the set value with 10-key and press START key. The set

value is outputted for 30 sec. 

5) Apply a high voltage tester between the measurement pin and

the frame.

Note: Take care not to short the measuring pin and the frame.
6) The unit stops after 30 sec of output.

Specification

Marking position

Measure from 
the P surface above.

54.2mm

Default

Set range

Measurement 

pin

High voltage 

probe 

impedance

Monitor output voltage

Set value

MC grid MAIN GRID 
(SIM 8-2)

AUTO

AE mode

45PPM: -650V±5V
35PPM: -620V±5V

45PPM: 645
35PPM: 615

200~900

CN2-7

100M

Ω

CHARACTER Text mode

-650V±5V

645

200~900

MIX

Text/Photo mode

-650V±5V

645

200~900

PHOTO

Photo mode

-650V±5V

645

200~900

PRINTER

Printer mode

-650V±5V

645

200~900

FAX

Fax mode

-650V±5V

645

200~900

Transfer current 
(THV+ (SIM 8-6)

FRONT

Front

45PPM: 267
35PPM: 220

0~620

BACK

Back

45PPM: 310
35PPM: 267

0~620

Developing bias DV 
BIAS (SIM 8-1)

AUTO

AE mode

45PPM: -500V±5V
35PPM: -470V±5V

485

0~745

CN2-1

100M

Ω

CHARACTER Text mode

-500V±5V

485

0~745

MIX

Text/Photo mode

-500V±5V

485

0~745

PHOTO

Photo mode

-500V±5V

485

0~745

PRINTER

Printer mode

-500V±5V

485

0~745

FAX

Fax mode

-500V±5V

485

0~745

PLUS

Positive bias

+150V±5V

150

0~255

Separation voltage SHV 
(SIM 8-17)

FRONT

Front

45PPM: +0.22±0.1V

35PPM: +1.37V±0.1V

45PPM: 160
35PPM: 120

0~240

CN2-3

10M

Ω

BACK

Rear

45PPM : +0.22±0.1V

35PPM: +1.37V±0.1V

45PPM: 160
35PPM: 120

0~240

Transfer voltage THV 
(SIM 8-17)

-800V±10V

780

0~1250

CN2-5

10G

Ω

AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 3

1) Place a test chart (UKOG-0089CSZZ) on the reference posi-

tion of the OC, and make a copy. 

2) Place a test chart (made as shown below) face-down on the

(D)SPF, set the document guide, and make a copy. (Single 

→

Single)

3) Place a test chart (made as shown below) face-up on the

DSPF, set the document guide, and make a copy. (Duplex 

→

Single)

4) Check each output copy.

(Image distortion/ each void/ lead edge position/ Off-center/
Magnification ratio/ Density/ Dirt, etc.)

5) If there is no problem in copy images, the image check is com-

pleted.

1) If there is any problem in checked images, perform self-print

and the adjustment positions (scanner side/ engine side) are
divided.

*:

If there is any problem in the copy image and no problem in
the self print, an adjustment on the scanner side is required.

If there is any problem on the copy image and any problem in
the self print, an adjustment on the engine side is required.

Perform the adjustment procedures as described below. 

• Nothing special

• Print off-center adjustment

• Print lead edge adjustment

• Front/rear and left/right void amount setting

1) Execute SIM64-1.

2) The print pattern "71" is printed. 

3) Check the output print.

4) Loosen two fixing screws of the LSU unit 

(M4 screws which are fixing the LSU and the top plate).

5) Adjust the LSU fixing position with the adjustment memory as

the reference.

6) Tighten two fixing screws of the LSU unit. 

7)  Print again in the grid pattern and check the print.

8)  Repeat procedures 4) to 7) until the specification is satisfied.

<1> Make self-print of pattern 71.

<2> Draw a line perpendicular to the sub scan direction (paper

transport direction) with a square. 
The point of intersection of the perpendicular line and the
horizontal line is regarded as the starting point. 

<3> Measure distance A (between the self-printed line and the

perpendicular line drawn with a square) at a position of
220mm from the starting point.

<4> Check that distance A satisfies the following specification. 

a.

Use standard paper of A3. 

b.

Mark to the full width of the paper so that each void/image
loss can be checked.

c.

At that time, mark so that the front /rear and the top/bottom
can be identified.

d.

Draw a center line in the paper transport direction to identify
the off center.

1

LSU right angle adjustment

SIM64-1: Pattern “71”

2

Print off-center adjustment

SIM50-10

3

Each tray resist amount setting

SIM51-2

4

Print lead edge adjustment

SIM50-5

5

Front/rear and left/right void 
amount setting

SIM50-1

6

OC scan distortion adjustment

7

SPF height adjustment

8

SPF scan distortion 
adjustment

SIM51-2

9

Scan magnification ratio

SIM48-1

10

SPF/DSPF scan magnification 
ratio

SIM48-1

11

OC scan lead edge adjustment

SIM50-1

12

SPF scan lead edge 
adjustment

SIM50-6

13

Original off-center adjustment

SIM50-12

Center line

Standard paper of A3

SIMULATION 64-1

SELF PRINT MODE. SELECT 0-7, AND PRESS START.

0. TRAY SELECT  :

1

   1. PRINT START

2. PRINT PATTERN:

87

  3. DENSITY   :

1

4. MULTI :       

1

   5. MODE      :

1

6. LEVEL :       

1

   7. DUPLEX    :

1

1

A

A

220mm

Print

lead edge

AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 4

• LSU right angle adjustment (If there is no distortion in self print,

the adjustment is not required.)

• Each tray resist amount setting

• Print lead edge adjustment

• Front/rear and left/right void amount setting

1) Execute SIM50-10.

2) Set the paper feed tray and the magnification ratio for the

adjustment.

3) After entering the adjustment values, press START key, and

printing is started.

4) Check the off-center (distance from the paper edge) of the

printed copy. Repeat procedure 2) until the specification is
satisfied.

• For the duplex mode (Single 

→

 Duplex), add 10 to the above set value. 

• When the print line is shifted toward a from the paper center, decrease the value.

• When the print line is shifted toward b from the paper center, increase the value.

• LSU right angle adjustment (If there is no distortion in self print,

the adjustment is not required.)

• Print off-center adjustment

• Print lead edge adjustment

• Front/rear and left/right void amount setting

1) Execute SIM 51-2.

2) Enter the resist adjustment value with 10-key.

3) Press [START] key. 

When [START] key is pressed, the adjustment value is set and
paper feed and copying are performed.

4) Adjust the resist quantity so that paper is transferred stably.

Measuring 

point

Specification

Set value

Print 
distortion 
adjustment

Self print 
pattern 71

θ

 = 90° ± 0.13°

θ

 changes about 0.25 

degrees for 1 scale of 
adjustment. (A shifts 
about 1mm.)

a b

Print lead edge

2

SIMULATION 50-10

PRINT OFF-CENTER ADJUSTMENT. SELECT 0-8, AND PRESS

START.

0.TRAY SELECT 

1

   1.COPY START

2.MAGNIFICATION 

100

(ADJUSTMENT DATA)

3.TRAY1 

50

 4.TRAY2 

50

 5.TRAY3 

50

6.TRAY4 

50

 7.BPT  

50

  8.ADU   

50

Adjustment position

Measurement 

reference

Specification

Set value

Default

Range

Tray 1

Tray 1

Output pattern 
center line

0±1.5mm

50

0 - 99

Set value 1: 0.1mm shift

Tray 2

Tray 2

Tray 3

Tray 3/LCC left

Tray 4

Tray 4/LCC right

MFT

Manual feed

ADU

Duplex

a

b

Print lead edge

∗

This adjustment is executed when there is any lead edge vari-
ation or skew for each tray.

1

SIMULATION 51-2

RESIST TIMING ADJUSTMENT. SELECT 0-8, AND PRESS START.

0.TRAY SELECT 

1

  1.PRINT START

2.TRAY1 

60

      3.TRAY2 

50

  4.DESK 

50

5.BPT   

55

      6.ADU   

50

 

7.SPF(HIGH) 

60

  8.SPF(LOW) 

75

AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 5

When the set value is increased, the warp amount of paper is
increased. When the adjustment value is decreased, the warp
amount of paper is decreased.

• LSU right angle adjustment (If there is no distortion in self print,

the adjustment is not required.)

• Print off-center adjustment

• Resist amount adjustment

• Front/rear and left/right void amount setting

• OC scan lead edge adjustment

• SPF scan lead edge adjustment

1) Execute SIM 50-5.
2) Set the lead edge void adjustment value (DENA) as specified

below.

(Standard set value) Paper lead edge void: 3.5mm (DENA:
35)

∗

Set the adjustment value of DENA to 35. (Enter 35 as the
adjustment value of DENA, and press [P] key.)

3) Check the lead edge void area on the self print pattern

(SIM67-1).

(Enter 1 and press [START] key.)

4) If the adjustment result is not satisfactory, perform the follow-

ing procedures.

∗

If the lead edge void area is not 3.5mm:
Change the adjustment value of RRCB and perform the
adjustment. (Change the adjustment value of RRCB and
press [START] key.)
(Shift for the adjustment value change: 0.1mm/step)

• LSU right angle adjustment (If there is no distortion in self print,

the adjustment is not required.)

• Print off-center adjustment

• Resist amount adjustment

• Print lead edge adjustment

• OC scan lead edge adjustment

• SPF scan lead edge adjustment

1) Execute SIM 50-1.
(Lead edge image loss/void area adjustment)

1) Set the lead edge image loss adjustment value (LEAD EDGE)

and the paper lead edge void adjustment value (DENA) as fol-
lows. 

(Standard set value) 
Lead edge image loss: 1.5mm (LEDA: 15)

Paper lead edge void: 3.5mm (DENA: 35)

∗

Set LEAD to 15. (Enter 15 as the adjustment value of LEAD,
and press [P] key.) (0.1mm/step)

∗

Set DENA to 35. (Enter 35 as the adjustment value of
DENA, and press [P] key.) (0.1mm/step)

2) Make a copy at the normal ratio (100%) and check the lead

edge void area and the image loss. (Enter 100 as the set value
of the copy magnification ratio (MAGNIFICATION), and press
[START] key.)

3) If the adjustment result is not satisfactory, perform the follow-

ing procedures.

∗

If the lead edge void are is not 3.5mm:
Change the adjustment value of RRCB and perform the
adjustment. (Change the adjustment value of RRCB and
press [START] key.) (1msec/step)

∗

If the lead edge image loss is not 1.5mm:
Change the adjustment value of RRCA and perform the
adjustment. (Change the adjustment value of RRCA and
press [START] key.)
(Shift for the adjustment value change: 0.2mm/step)

(Rear edge void area adjustment)

Adjust so that the rear edge void area is 3.5mm. (Change the
adjustment value of TRAIL EDGE, and press [START] key.)

(Front/rear frame direction image loss adjustment)

Set the adjustment value of SIDE to 20. (Enter 20 as the adjust-
ment value of SIDE, and press [P] key.)

When the adjustment value is changed, the image position is
shifted in the front/rear frame direction.

(Front/rear frame direction void area adjustment)

Adjust so that the total of the front/rear direction void areas is
7.0mm. (Change the adjustment values of FRONT/REAR, and
press [START] key.)

Front frame void area = 3.5mm

Rear frame void area = 3.5mm

If, as shown above, the front and the rear void areas are not even,
use SIM 50-5 to adjust the image off-center position.

Item

Set 

range

Default

AR-M351U/

M355U

AR-M451U/

M455U

2 TRAY1

Tray 1 resist 
adjustment value

0 - 99

65

60

3 TRAY2

Tray 2 resist 
adjustment value

55

50

4 DESK

Desk resist 
adjustment value

55

50

5 BPT

Manual tray resist 
adjustment value

60

55

6 ADU

ADU resist 
adjustment value

55

50

Set position 

Specification 

Set value

Self print lead 
edge 
adjustment  
SIM 50-5

Print start 
position A of 
the output 
pattern 1

A = 4.0mm or less
(Lead and tail 
total: 8.0mm or 
less)

Shift of 
0.175mm 
(35ppm) / 
0.225mm 
(45ppm) for 
set value 1.

2

SIMULATION 50-5
LEAD EDGE ADJUSTMENT. SELECT 0-20, AND PRESS START.
0.TRAY SELECT 

1

  1.PRINT START

(ADJUSTMENT DATA)
LEAD EDGE: 2.RRCB 

50

    3.SIDE2 ADJ. 

50

RESIST:  4.T1  

50

  5.T2  

50

  6.DESK 

50

         7.BPT 

50

  8.ADU 

50

OFF CENTER: 9.T1   

50

  10.T2  

50

  11.T3 

50

  12.T4 

50

            13.BPT 

50

  14.ADU 

50

(VOID SETTING) 15.LEAD_EDGE(DENA)  

50

               16.TRAIL_EDGE(DENB) 

30

  17.FRONT/REAR 

30

A

[Output pattern]