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AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 9

• Adjustment on the engine side (If there is no problem in self

print, no need to adjust.)

• OC scan distortion adjustment

• SPF scan distortion adjustment

• OC scan magnification ratio adjustment

• SPF scan lead edge adjustment

• Original off-center adjustment

1) Set an original on the original table. 

2) Enter SIM 50-1.

3) Make a copy. 

4) Select the number to be set on the right of the LCD, and per-

form the adjustment of each item.

5) Select "4: RRC-B" so that the distance between the paper lead

edge and the copy image lead edge is within 4.0mm. Change
the value with 10-key and perform the copy adjustment. 

6) Select "5: DEN-B" so that the white spot in the latter half of

copy (rear edge void) is within 4.0mm. Change the value with
10-key and perform the copy adjustment. 
(The rear void adjustment is changed by the step of 0.1mm.)

• When the rear edge void is too small, increase the value.

• When the rear edge void is too great, decrease the value.

7) Select "3: RRC-A," change the value with 10-key, and adjust

the document scan start position.

8) Press [CA] key to cancel the simulation.

• Adjustment on the engine side (If there is no problem in self

print, no need to adjust.)

• SPF scan distortion adjustment

• SPF scan lead edge adjustment

• SPF magnification ratio adjustment

• SPF/DSPF off-center adjustment

1) Make a copy of a chart which indicates the image loss amount

of each side with SPF/DSPF.

2) Execute SIM50-6 and change the values.

Item

Content

Specification

Set 

range

Default

(Lead edge adjustment value)

3 RRCA

Document scan 
start position

4.0mm or 
less

0 - 99

50

Set value 
1: 0.1mm 
shift

4 RRCB

Resist roller 
clutch ON timing 
adjustment value

4.0mm or 
less

10 SIDE2 ADJ.

Correction value 
for RRCB when 
refereeing from 
ADU

1 - 99

50

(Image loss set value)

5 LEAD

Lead edge image 
loss set value

0 - 99

15

Set value 
1: 0.1mm 
shift

6 SIDE

Side image loss 
set value

20

(Void set value)

7 LEAD_EDGE 

(DENA) 

Lead edge void 
set value

Total 8mm 
or less

0 - 99

35

Set value 
1: 0.1mm 
shift

8 TRAIL_EDGE 

(DENB) 

Rear edge void 
adjustment value

Total 8mm 
or less

9 FRONT/

REAR

Front/Rear void 
adjustment value

Total 8mm 
or less

32

2

SIMULATION 50-1

LEAD EDGE ADJUSTMENT. SELECT 0-9, AND PRESS START.

0.TRAY SELECT 

1

   1.COPY START

2.MAGNIFICATION 

100

(ADJUSTMENT DATA) 3.RRCA 

50

   4.RRCB 

50 

10.SIDE2 ADJ. 

50

(IMAGE LOSS SETTING) 5.LEAD 

15

 6.SIDE 

20

(VOID SETTING) 7.LEAD_EDGE(DENA) 

35

               8.TRAIL_EDGE(DENB)

35

  9.FRONT/REAR 

32

Item

Set 

range

Default

0

TRAY SELECT

Paper feed tray 
selection

1 - 6

–

1

COPY START

Copy START (Default)

–

–

2

MAGNIFICATION Print magnification ratio

25 - 

200%

–

(Lead edge adjustment value)

3

SIDE1

Front surface document 
scan start position 
adjustment value

0 - 99

50

4

SIDE2

Back surface document 
scan start position 
adjustment value

(Image loss set value: SIDE 1)

5

LEAD_EDGE

Front surface lead edge 
image loss set value

0 - 99

15

6

FRONT_REAR

Front surface side edge 
image loss set value

20

7

TRAIL_EDGE

Front surface rear edge 
image loss set value

0 - 20

0

(Image loss set value: SIDE 2)

8

LEAD_EDGE

Back surface lead edge 
image loss set value

0 - 99

15

9

FRONT/REAR

Back surface side edge 
image loss set value

20

10 TRAIL_EDGE

Back surface rear edge 
image loss set value

0 - 20

0

*: For output, select the right side tray.

<Document>

Document set reference

Output result

Rear edge void

Lead edge void

Adjust 
with 
RRCB.

Adjust
with
RRCA.

Image loss
(SIDE)

FR void

Image loss

(LEAD)

Paper transport direction

2

SIMULATION 50-6

LEAD EDGE ADJUSTMENT(SPF). SELECT 0-10, AND PRESS

START.

0.TRAY SELECT 

1

   1.COPY START

2.MAGNIFICATION 

100

(ADJUSTMENT DATA)3.SIDE1 

50

 4.SIDE2 

50

(IMAGE LOSS SETTING)

SIDE1: 5.LEAD_EDGE 

15

 6.FRONT/REAR 

20

  7.TRAIL_EDGE 

0

SIDE2: 8.LEAD_EDGE 

15

 9.FRONT/REAR 

20

 10.TRAIL_EDGE 

0

AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 10

∗

With the above + 10, the SPF enters the duplex mode (DD),
making duplex copy.

• Adjustment on the engine side (If there is no problem in self

print, no need to adjust.)

• OC scan distortion adjustment

• SPF scan distortion adjustment

• OC scan magnification ratio

• SPF scan lead edge adjustment

• Nothing special

1) Set an original on the original table. 

2) Execute SIM 50-12.

3) Select the paper feed tray and the magnification ratio. 

4) After entering the adjustment value, pres START key, and

printing is started.

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

the printed copy. Repeat procedure 2 until the printed copy
satisfies the specifications.

• 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.

• This adjustment requires a high-level preciseness.

It is easier to perform the scanner unit distortion adjustment pre-
viously described. 

Before performing this adjustment, the following adjustment must
have been completed.

• LSU right angle adjustment

1) Make a test chart as shown below. (Print a self-print pattern

71.)

2) Make a copy from the table glass, and check it. 

At that time, set the test chart correctly. If it is set in a distorted
position, the adjustment cannot be made correctly.

3) If the output value is not in the specified range, perform the fol-

lowing adjustment.

4) Remove the front cabinet in front of the scanner, and check

that installing position of the MB rail. 

5) Loosen the screw at the right of the MB rail to adjust.

Normal display

NOW COPYING

ERROR display

Door open

DOOR OPEN.

Jam

JAM

Paper empty

PAPER EMPTY.

1

TRAY1

2

TRAY2

3

TRAY3

4

TRAY4

5

Manual feed

Set range

25 - 200%

Adjustment position

Measurem

ent 

reference

Specification

Set value

Default

Range

Original 
off-center 
SIM50-12

PLATEN

OC mode

Copy 
output 
center line

As shone in 
the table 
below.

50

0 – 99 Set value 

1: 0.1mm 
shift

SPF 
SIDE1

SPF front 
surface 
adjustment

SPF 
SIDE2

SPF back 
surface 
adjustment

a

b

Specification ± 1.5mm 

Print lead edge

2

SIMULATION 50-12

ORIGINAL OFF-CENTER ADJUSTMENT. SELECT 0-9, AND PRESS

START.

0.TRAY SELECT 

1

   1.COPY START

2.MAGNIFICATION 

100

(ADJUSTMENT DATA)

3.PLATEN 

50

 4.SPF SIDE1 

50

 5.SPF SIDE2 

50

Machine (OC mode)

Single

±1.5mm

Duplex

±1.7mm

Overall (DSPF)

Single S - S

±2.8mm

Single D - S

±3.5mm

Duplex S - D

±3.0mm

Duplex D - D

±3.5mm

Measurement 

point

Specification

Set value

OC scan 
distortion 
adjustment

Angle 

θ

 in the 

above figure

θ

 = 90°±0.13° 1 scale = about 

0.25°shift in 

θ

AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 11

1) Insert the front/rear mirror base drive wire into the frame

groove and press and fix it with the wire holder. At that time,
do not tighten the wire fixing screw. Change the direction of
the lamp positioning plate. (F and R)

2) Push the copy lamp unit onto the positioning plate, and tighten

the wire fixing screw.

After fixing, manually shift the copy lamp unit a few times to check

that it moves smoothly.

This adjustment is to adjust the parallelism of the mirror base to
the OPC drum surface and the original surface.

1) Manually turn the mirror base drive pulley to bring mirror base

B into contact with mirror base positioning plate.
If, at that time, the front frame side and the frame side of mirror
base B are brought into contact with the mirror base position-
ing plate simultaneously, the parallelism is correct and there is
no need for adjustment.

This adjustment is executed in the following cases:

• When the mirror base drive wire is replaced.

• When the lamp unit, or No. 2/3 mirror holder is replaced.

• When a copy shown below is made.

1) Set A3 white paper on the original table as shown below.

2) With the original cover open, make a normal (X 1.0) copy.

3) Measure the black distance at the lead edge and the rear

edge of the copy paper.

If La = Lb, the procedures 4) through 7) are not required.

Lb

La

Original

Paper
exit
direction

Copy

Glass holding plate

Fit the paper edge and
the glass holding plate edge

A3 white paper

Paper exit direction

La : Lead edge black background section
Lb : Rear edge black background section

AR-M351U/M451U, AR-M355U/M455U  ADJUSTMENTS  8 - 12

4) Loosen the fixing screw of the front or the rear frame mirror

base drive pulley.

5) Tighten the fixing screw of the mirror base drive pulley.

6) Perform procedures 1) through 3).

7) If La is not equal to Lb, perform procedures 4) and 5).

If La = Lb, the adjustment is completed.
Repeat procedures 1) through 6) until La = Lb.

1) Execute SIM 41-3.

2) Open the original cover. Press the original detection light-emit-

ting unit gradually with your finger to check the height at which
OCSW display on the LCD is highlighted. 

3) Open the original detection light-emitting unit gradually to

check the height at which OCSW display turns to the normal
state.

4) If the heights are out of the specified range in procedures 2)

and 3), adjust the height of the original detection light emitting
unit by shifting the adjustment screw. 

5) After completion of adjustment, press the original detection

light emitting unit fully downward with your finger and release
it. Check that the original detection light-emitting unit moves
up smoothly.

1) Execute SIM 41-1.

2) Put A3 (or WLT) paper on the table glass, and check that all

the sensor displays (except for OCSW) on the LCD are high-
lighted.

3) Gradually move the unit to the left, and check that the high-

lighted sensor displays turn off one by one sequentially. 

1) Execute SIM 41-2. 

∗

At that time, check that the scanner mirror base is at the
home position. 

2) Open the document cover. Select 1 without placing paper on

the table glass, and press START.

3) When COMPLETE is displayed on the LCD, press CUSTOM

SETTING to return to the initial screen. 

4) Place A3 (or WLT) paper on the table glass, select 2 and

press START.
When COMPLETE is displayed, the adjustment is normally
completed. 

∗

If ERROR is displayed, the error PD sensor is displayed.

•If La < Lb, turn the rear frame mirror base drive pulley in

direction B. 
(Do not move the mirror base drive pulley shaft.)

•If La > Lb, turn the rear frame mirror base drive pulley in

direction A. 
(Do not move the mirror base drive pulley shaft.)

A

B

Front side

Rear side

Adjust screw

32±0.5mm

SIMULATION 41-3

PD SENSOR DATA DISPLAY.

OCSW

PD1[128]: 200     PD2[128]: 200

PD3[128]:  50     PD4[128]:  52

PD5[128]:  51     PD6[128]:  50

PD7[128]:  52

Specification Adjustment position

Original size 
detection position

32±0.5mm

Height adjustment 
screw

SIM 41-3

Select 2 and press [START] key. 
(Error)

Press [CUSTOM SETTINGS] 
key.

Specification

Adjustment

Document size detection photo 
sensor adjustment

COMPLETE

SIM 41-2

SIMULATION 41-1

PD SENSOR CHECK..

OCSW  

PD1

  

PD2

  

PD3

  PD4  PD5  PD6  PD7

SIMULATION 41-2

PD SENSOR ADJUSTMENT. SELECT1-2, AND PRESS START.

(PLEASE OPEN THE ORIGINAL COVER.) 

1. NO ORIGINAL

2. A3 ORIGINAL

1

SIMULATION 41-2

Press [CUSTOM SETTINGS] key. 

Select 1 and 
press [START] key. 

PD SENSOR ADJUSTMENT.

NO ORIGINAL ··· COMPLETE (or "ERROR at 

PD1 PD2

...")

A3 ORIGINAL ··· INCOMPLETE

SIMULATION 41-2

PD SENSOR ADJUSTMENT.

NO ORIGINAL ··· COMPLETE

A3 ORIGINAL ··· COMPLETE (or "ERROR at 

PD1 PD2

...")