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MX-M753N  ADJUSTMENTS AND SETTINGS  5 – 52

 

This manual adjustment is used when the automatic adjustment of
SIM 50-28 cannot obtain a satisfactory result.

 

This adjustment is needed in the following situations:
* When the scanner (reading) section is disassembled.
* When the scanner (reading) unit is replaced.
* When the LSU is replaced or removed.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
* The scanner control PWB has been replaced.
* The EEPROM on the scanner control PWB has been replaced.

NOTE: Before executing this adjustment, be sure to confirm that

the “Print engine image skew, image position, image mag-
nification ratio, void area adjustments” has been completed
normally.

1)

Place a scale on the document table as shown in the figure
below.
Place a scale so that it is in parallel with the scanning direction
and that its lead edge is in contact with the document guide
plate.
Place white paper on the document table so that the scale lead
edge can be seen.

2)

Enter the SIM 50-1 mode.

3)

Set RRCA, LEAD, and SIDE to the default values.

A

Lead 
edge 
adjust-
ment 
value

RRCA

Document lead 
edge reference 
position (OC)

0 - 99

50

B

RRCB-CS12

Resist 
motor 
ON 
timing 
adjust-
ment

Standard 
Tray

1 - 99

50

C

RRCB-CS34

Desk

1 - 99

50

D

RRCB-LCC

LCC

1 - 99

50

E

RRCB-MFT

Manual 
paper feed

1 - 99

50

F

RRCB-ADU

ADU

1 - 99

50

G

Image 
loss area 
setting 
value

LEAD

Lead edge image 
loss area setting

0 - 99

30

H

SIDE

Side image loss 
area adjustment

0 - 99

20

I

Void area 
adjust-
ment

DENA

Lead edge void 
area adjustment

1 - 99

30

J

DENB

Rear edge void area 
adjustment

1 - 99

30

K

FRONT/
REAR

FRONT/REAR void 
area adjustment

1 - 99

30

L

Off-center 
adjust-
ment

OFFSET_
OC

OC document off-
center adjustment

1 - 99

50

M

Magnifi-
cation 
ratio 
correction

SCAN_
SPEED_OC

SCAN sub scanning 
magnification ratio 
adjustment (CCD)

1 - 99

50

N

Sub 
scanning 
direction 
print area 
correction 
value

DENB-MFT

Manual feed 
correction value

1 - 99

50

O

DENB-CS1

Tray 1 correction 
value

1 - 99

50

P

DENB-CS2

Tray 2 correction 
value

1 - 99

50

Q

DENB-CS3

Tray 3 correction 
value

1 - 99

50

OK

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2.

MX-M753N  ADJUSTMENTS AND SETTINGS  5 – 53

4)

Perform the image lead edge reference position adjustment.
Press [CLOSE] key, and shift from the simulation mode to the
copy mode and make a copy in 100% mode and in 200%
mode.
When the adjustment value of RRCA is proper, the lead edge
image from 3.0mm is not copied in either of 100% and 200%
copy scale.
If not, change and adjust the RRCA value.
(Adjust so that the lead edge image from 3.0mm is not copied
in either of different copy magnification ratios.)
Repeat the above procedures until a satisfactory result is
obtained.

5)

Image loss adjustment
When the adjustment item of the image loss below is set to the
default value, it is adjusted to the standard state. If it is not in
the below standard state, or when it is set to a desired value,
change these adjustment items.

Void area: 3.0mm, Image loss: 3.0mm

When the adjustment value is increased, the image loss is
increased. When the adjustment value is decreased, the
image loss is decreased.
When the adjustment value is changed by 1, the void area is
changed by 0.1mm.

 

This adjustment must be performed in the following cases:
* When the scan control PWB is replaced.
* When the EEPROM on the scan control PWB is replaced.
* When the scanner (reading) section is disassembled.
* When the scanner (reading) section is replaced.
* When U2 trouble occurs.
* When the DSPF section is disassembled.
* When the DSPF unit is replaced.
This simulation is to adjust the scanner reading position when
scanning the front surface in the DSPF mode.
If this adjustment is made improperly, the scanner stop position is
shifted to the specified position and a shade of the document table
may be reflected on the lead edge section of the scan image in the
DSPF (front surface) mode.

1)

Make a copy in the DSPF (front surface) mode, and check for
any shade on the lead edge section of the copy image.

If there is any shade of the document table on the lead edge
section of the copy image, perform the following procedures.

2)

Enter the SIM 53-8 mode, and press [MANUAL] key.

3)

Enter an adjustment value with 10-key, and press [OK] key.
When the set value is increased, the distance from the home
position to the DSPF scanning position is increased. When the
set value is changed by 1, the scanning position is changed by
0.1mm.

Perform the procedures of 1) - 3) until a satisfactory result is
obtained.

NOTE: After execution of this adjustment, be sure to execute

“Copy mode image loss adjustment (DSPF mode)”.

R

Sub 
scanning 
direction 
print area 
correction 
value

DENB-CS4

Tray 4 correction 
value

1 - 99

50

S

DENB-LCC

LCC correction 
value

1 - 99

50

T

DENB-ADU

ADU correction 
value

1 - 99

50

LEAD

Image loss 
adjustment

Lead edge 
image loss 
adjustment

0 - 99

30

3.0

 1.0mm

SIDE

Side image 
loss 
adjustment

0 - 99

20

2.0

 1.0mm

100%

200%

Paper lead
edge

Scale image 3.0mm position

5mm 10mm

5mm

10mm

5mm

4

3

2

1

Paper lead edge

Maginification ratio : 400%

Copy area

Image area

Papar lead edge

Shadow image of DSPF

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MX-M753N  ADJUSTMENTS AND SETTINGS  5 – 54

 

This adjustment must be performed in the following cases:
* When the scan control PWB is replaced.
* When the EEPROM on the scan control PWB is replaced.
* When the scanner (reading) section is disassembled.
* When the scanner (reading) unit is replaced.
* When U2 trouble occurs.
* When the DSPF section is disassembled.
* When the DSPF unit is replaced.

NOTE: To execute this adjustment, the following items must have

been properly adjusted.

* Print engine image position adjustment
* Print engine print area (void area) adjustment
* Main scanning direction image magnification ratio adjustment

(DSPF mode)

* Sub scanning direction image magnification ratio adjustment

(DSPF mode)

* Scan image off-center adjustment (DSPF mode)
* Document scan position adjustment (DSPF mode scanner scan

position adjustment)

1)

Prepare the adjustment chart.
The adjustment chart can be made by the following proce-
dures.
Use A4 (11" x 8.5") paper and draw arrow marks vertically and
horizontally on the front and the back surfaces.
At the same time, put marks of the lead edge, the trail edge,
the front end, and the rear end as well as the identification
marks of the front surface and the back surface.

2)

Enter the SIM 50-6 mode.

* Item A, B: When the adjustment value is increased, the scan 

timing is delayed.

* Item C - H: When the adjustment value is increased, the image

loss is increased.

* Item A - H: 1 step = 0.1mm change
* The DSPF rear edge image loss setting is provided for counter-

measures against the case when shades are produced.

NOTE: When [CLOSE] key is pressed in this simulation mode, the

machine goes into the normal operation mode. Under this
state, copy check can be normally performed. When the
system key is pressed, the machine returns to the simula-
tion mode.

F

L

R

FACE

BACK

R

T

F

L

T

Draw arrows.

Draw arrows.

Put the position

marks.

Put the position

marks.

A

SIDE1

Front surface 
document scan 
position 
adjustment 
(CCD)

1 - 99

50

B

SIDE2

Back surface 
document scan 
position 
adjustment (CIS)

1 - 99

50

C

Image 
loss 
amount 
setting 
SIDE1

LEAD_EDGE 
(SIDE1)

Front surface 
lead edge image 
loss amount 
setting

0 - 99

20

D

FRONT_REAR 
(SIDE1)

Front surface 
side image loss 
amount setting

0 - 99

20

E

TRAIL_EDGE 
(SIDE1)

Front surface rear 
edge image loss 
amount setting

0 - 99

30

F

Image 
loss 
amount 
setting 
SIDE2

LEAD_EDGE 
(SIDE2)

Back surface lead 
edge image loss 
amount setting

0 - 99

30

G

FRONT_REAR 
(SIDE2)

Back surface side 
image loss 
amount setting

0 - 99

20

H

TRAIL_EDGE 
(SIDE2)

Back surface rear 
edge image loss 
amount setting

0 - 99

20

I

OFFSET_SPF1

DSPF front 
surface document 
off-center 
adjustment

1 - 99

50

J

OFFSET_SPF2

DSPF back 
surface document 
off-center 
adjustment

1 - 99

50

K

SCAN_SPEED_SPF1

DSPF image 
magnification 
ratio adjustment 
(Sub scan)

1 - 99

50

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2.

MX-M753N  ADJUSTMENTS AND SETTINGS  5 – 55

1)

Set the lead edge image loss adjustment values (LEAD EDGE
(SIDE1/SIDE2)) on the front surface and the back surface to
the following values.
(Standard set value)
LEAD EDGE(SIDE 1): 

20 Lead edge image loss set value (Front surface)

LEAD EDGE(SIDE 2): 

30 Lead edge image loss set value (Back surface)

(When the set value is increased, the lead edge image loss is
increased.)
(Change for change in the set value: 0.1mm/step)

2)

Make a duplex copy in 100% in the DSPF mode. Check to
confirm that the lead edge image loss is within 3.0 

 1.0mm on

the front surface and the back surface. The paper lead edge
must be aligned with the presumed image lead edge.

If the above condition is not satisfied, perform the following
procedure.

3)

Enter the adjustment value of SIDE1/SIDE2 with 10-key, and
press [OK] key.
Adjust so that the paper lead edge is aligned with the pre-
sumed image lead edge.
SIDE1: Front surface lead edge scan position adjustment
SIDE2: Back surface lead edge scan position adjustment
(When the adjustment value is increased, the print image posi-
tion is shifted to the delaying direction for the paper.)
(Change for change in the set value: 0.1mm/step)

1)

Make a duplex copy in 100% in the DSPF mode. Check to
confirm that the rear edge image loss is 2.0 - 5.0mm on the
front surface and the back surface.

If the above condition is not satisfied, perform the following
procedure.

2)

Enter the adjustment value of TRAIL EDGE (SIDE1/SIDE2)
with 10-key, and press [OK] key.
TRAIL EDGE (SIDE 1): 

Rear edge image loss adjustment value (Front surface)

TRAIL EDGE (SIDE 2): 

Rear edge image loss adjustment value (Back surface)

(When the adjustment value is increased, the rear edge image
loss is increased.)
(Change for change in the set value: 0.1mm/step)

1)

Make a duplex copy in 100% in the DSPF mode. Check to
confirm that the image losses on the front frame side and the
rear frame side are 2.0

2.0mm on the front surface and the

back surface.

If the above condition is not satisfied, perform the following
procedure.

2)

Enter the adjustment value of FRONT/REAR (SIDE 1) /
FRONT/REAR (SIDE 2), and press [OK] key.
FRONT/REAR (SIDE 1): 

Front/Rear image loss adjustment value (Front surface)

FRONT/REAR (SIDE 2): 

Front/Rear image loss adjustment value (Back surface)

(When the adjustment value is increased, the front/rear image
loss is increased.)
(Change for change in the adjustment value: 0.1mm/step)

Paper lead edge

Copy image

Image loss

3.0 1.0mm

The paper lead edge must be aligned with

the image lead edge.

Paper rear edge

Copy image

Image loss 2.0 - 5.0mm

Paper F

side edge

Paper R

side edge

Copy image

Copy image

Image loss

2.0 2.0mm

Image loss

2.0 2.0mm