DOWNLOAD Sharp MX-6500N / MX-7500N (serv.man19) Service Manual ↓ Size: 5.74 MB | Pages: 98 in PDF or view online for FREE

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 89

4) Perform the image lead edge reference position adjustment.

Shift to the copy mode, and make a copy at each of 100% and
200% in the document table mode.
When the adjustment value of RRCA is proper, the lead edge
image from 4.0mm 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 4.0mm 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: 4.0mm, Image loss: 4.0mm

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 scanning position when scanning in
the DSPF mode.
If this adjustment is made improperly, the scanner stop position is
shifted from 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 mode.
1)

Make a copy in the DSPF 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.

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

ADJ18C Copy image position, image loss, void area
adjustment (Manual adjustment) (DSPF mode).

LEAD

Image loss 
adjustment

Lead edge 
image loss 
adjustment

0 - 99

40

4.0

+/- 1.0mm

SIDE

Side image 
loss 
adjustment

0 - 99

20

2.0

+/- 1.0mm

5mm

 

5mm 

10mm 

100% 

200%

Paper lead
edge

Scale image 4.0mm position

5mm

10mm

 

4

3

2

1

Paper lead edge

Maginification ratio : 400%

Copy area

Image area

Papar lead edge

Shadow image of DSPF

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

63)6&$11,1*326,7,21$'-8670(17

$872

0$18$/

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 90

 

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.

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 coun-

termeasures against the case when shades are produced.

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): 

40 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)

F

L

R

FACE

BACK

R

T

F

L

T

Draw arrows.

Draw arrows.

Put the position 
marks.

Put the position 
marks.

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

7(67

/($'('*($'-8670(179$/8(63)

$˖

˷̚˹

˖6,'(

$˖

˖6,'(

%˖

˖/($'B('*(6,'(

&˖

˖)5217B5($56,'(

'˖

˖/($'B('*(6,'(

)˖

˖75$,/B('*(6,'(

(˖

˖)5217B5($56,'(

*˖

˖75$,/B('*(6,'(

+˖

˖2))6(7B63)

,˖

˖2))6(7B63)

-˖

˖6&$1B63(('B63)

.˖

2.

A

SIDE1

Front surface 
document scan 
position adjustment 
(CCD)

1 - 99

50

B

SIDE2

Back surface 
document scan 
position adjustment 
(CCD)

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

40

F

Image loss 
amount 
setting 
SIDE2

LEAD_
EDGE 
(SIDE2)

Back surface lead 
edge image loss 
amount setting

0 - 99

40

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 document front 
surface magnification 
ratio (Sub scan)

1 - 99

50

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 91

2) Make a duplex copy in 100% in the DSPF mode. Check to

confirm that the lead edge image loss is within 4.0 +/- 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)

Perform the procedures of 2) - 3) until a satisfactory result is
obtained.

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)

Perform the procedures of 1) - 2) until a satisfactory result is
obtained.

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)

Perform the procedures of 1) - 2) until a satisfactory result is
obtained.

Paper lead edge

Copy image

Image loss 
4.0    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

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 92

 

This adjustment must be performed in the following cases:
* When the finisher is disassembled.
* When the finisher control PWB is replaced.
* When the punch unit is disassembled.
* When the punch control PWB is replaced.
* When the alignment is improper.
* When the punch hole position is shifted.
* When the staple position is shifted.

1)

Enter the SIM 3-10 mode.

2) Select an adjustment target item with the scroll key.

ǂǂǂ6,08/$7,21ǂǂ12

7(67

&/26(

˖)5217$'-867

˖67$3/(5($5

˖67$3/()5217

˖381&+&(17(5

˖381&++2/(

),1,6+(5$'-8670(17

$

˷̚˹

$˖

%˖

&˖

'˖

(˖

2.

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

.(<

%$&.

0212

&2/25

(;,7

&/($5

A

FRONT 
ADJUST

Alignment position 
adjustment (front)

0 - 20

10

When the paper 
alignment capability 
in the stacker 
section is improper, 
the paper alignment 
width is adjusted.

F side paper 
alignment plate stop 
position 
(F/R direction)

When the adjustment value is 
increased, the alignment 
position is shifted to the 
center.
When the adjustment value is 
decreased, the alignment 
position is shifted to the 
outside.

0.2mm

B

STAPLE REAR

Stapling position 
adjustment (Rear, 
one position)

94 - 
106

100

When the stapling 
position on the R 
side is shifted, the 
adjustment is 
executed.

Stapling position 
(stapler stop 
position) 
(F/R direction)

When the adjustment value is 
increased, the distance 
between the stapling position 
and the paper edge becomes 
longer.
When the adjustment value is 
decreased, the distance 
between the stapling position 
and the paper edge becomes 
shorter.

0.2mm

C

STAPLE 
FRONT

Stapling position 
adjustment (one 
position in front)

94 - 
106

100

When the stapling 
position on the F 
side is shifted, the 
adjustment is 
executed.

Stapling position 
(stapler stop 
position) 
(F/R direction)

When the adjustment value is 
decreased, the distance 
between the stapling position 
and the paper edge becomes 
shorter.
When the adjustment value is 
increased, the distance 
between the stapling position 
and the paper edge becomes 
longer.

0.2mm

D

PUNCH 
CENTER

Punch center 
adjustment

30 - 70

50

When the punch off-
center is shifted, the 
adjustment is 
executed.

Punching position 
(F/R direction)

When the adjustment value is 
increased, the hole position is 
shifted to the front.
When the adjustment value is 
decreased, the hole position 
is shifted to the rear.

0.2mm

E

PUNCH HOLE

Punch hole 
position 
adjustment

46 - 52

50

When the punch 
hole position is 
shifted in the 
transport direction, 
the adjustment is 
executed.

Punch position 
(paper transport 
direction)

When the adjustment value is 
increased, the punch hole 
position is shifted to the rear 
edge of paper.
When the adjustment value is 
decreased, the punch hole 
position is shifted to the lead 
edge of paper.

0.2mm