DOWNLOAD Sharp DX-C310 / DX-C311 / DX-C400 / DX-C401 (serv.man5) Service Manual ↓ Size: 90.24 MB | Pages: 127 in PDF or view online for FREE

DX-C401  ADJUSTMENTS  4 – 25

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)

Go through the modes specified in Simulation 50-1.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

3)

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

4)

Perform the image lead edge reference position adjustment.
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

A

Lead 
edge 
adjust-
ment 
value

RRCA

Document lead edge 
reference position 
(OC)

0 - 99

50

B

RRCB-CS1

Resist 
motor ON 
timing 
adjust-
ment

Standard 
Tray

1 - 99

50

C

RRCB-DSK

Desk 

1 - 99

50

D

RRCB-MFT

Manual 
paper 
feed

1 - 99

50

E

RRCB-ADU

ADU

1 - 99

50

F

Image 
loss area 
setting 
value

LEAD

Lead edge image 
loss area setting

0 - 99

30

G

SIDE

Side image loss area 
adjustment

0 - 99

20

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

$˖

˷̚˹

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

˖55&$

$˖

˖55&%&6

%˖

˖55&%'6.

&˖

˖55&%0)7

'˖

7(67

H

Void area 
adjust-
ment

DENA

Lead edge void area 
adjustment

1 - 99

30

I

DENB

Rear edge void area 
adjustment

1 - 99

30

J

FRONT/
REAR

FRONT/REAR void 
area adjustment

1 - 99

30

K

Off-center 
adjust-
ment

OFSET_OC

OC document off-
center adjustment

1 - 99

50

L

Magnifica
tion ratio 
correction

SCAN_
SPEED_OC

SCAN sub scanning 
magnification ratio 
adjustment (CCD)

1 - 99

50

M

Sub 
scanning 
direction 
print area 
correction 
value

DENB-MFT

Manual feed 
correction value

1 - 99

50

N

DENB-CS1

Tray 1 correction 
value

1 - 99

50

O

DENB-CS2

Tray 2 correction 
value

1 - 99

50

P

DENB-CS3

Tray 3 correction 
value

1 - 99

50

Q

Sub 
scanning 
direction 
print area 
correction 
value

DENB-CS4

Tray 4 correction 
value

1 - 99

50

R

DENB-ADU

ADU correction value

1 - 99

50

100%

200%

Paper lead
edge

Scale image 3.0mm position

5mm 10mm

5mm

10mm

5mm

4

3

2

1

Paper lead edge

Copy area

DX-C401  ADJUSTMENTS  4 – 26

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 is needed in the following situations:
* The scan control PWB has been replaced.
* The EEPROM on the scan control PWB has been replaced.
* The scanner (reading) section has been disassembled.
* The scanner (reading) unit has been replaced.
* U2 trouble has occurred.
* The RSPF section has been disassembled.
* The RSPF unit has been replaced.
This adjustment is intended to adjust the scanner read position in
RSPF-mode scan.
An incorrect adjustment would deviate the scanner stop position
from the required position, thus possibly causing a shadow of the
original table to appear at the leading edge of an image generated
by RSPF mode scan.
1)

Make a copy in RSPF mode, and make sure that the printed
image at the leading edge of the copied image is free from
shadows.

If the printed image at the leading edge of the copied image
contains a shadow of the original table, then do the following
steps.

2)

Go through the modes specified in Simulation 53-8. Select the
[MANUAL] mode.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

3)

Enter the adjustment value and press the [OK] key. (For the
4.3 Inch LCD model, press the OSA shortcut key.)
<<Description of adjustment display>>

• When the set value is increased, the distance from the home

position to the RSPF scan position is increased.

• When the set value is changed by 1, the scan position is

changed by 0.1mm.

• Repeat the procedures of 1) - 3) until a satisfactory result is

obtained. 

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

execute ADJ 12C Copy image position, image loss 
adjustment (RSPF mode).

 

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.

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

Image area

Papar lead edge

Shadow image of RSPF

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

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

7(67

$872

0$18$/

A

ADJUST VALUE

RSPF scan position 
adjustment

1 - 99

70

F

L

R

FACE

BACK

R

T

F

L

T

Draw arrows.

Draw arrows.

Put the position

marks.

Put the position

marks.

DX-C401  ADJUSTMENTS  4 – 27

2)

Enter the SIM50-6 mode.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

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): 

30 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 RSPF 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. (For the 4.3 Inch LCD model, press the OSA
shortcut key.)
Adjust so that the paper lead edge is aligned with the pre-
sumed image lead edge.
SIDE1: 

Front surface document lead edge scan position adjustment

SIDE2: 

Back surface document 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.

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

30

F

Image 
loss 
amount 
setting 
SIDE2

LEAD_EDGE 
(SIDE2)

Back surface lead 
edge image loss 
amount setting

0 - 99

20

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

30

I

OFSET_SPF1

SPF front surface 
document off-
center adjustment

1 - 99

50

J

OFSET_SPF2

SPF back surface 
document off-
center adjustment

1 - 99

50

K

SCAN_SPEED_SPF1

RSPF document 
front surface 
magnification ratio 
(Sub scan)

1 - 99

50

L SCAN_SPEED_SPF2

RSPF 

document 

back surface 
magnification ratio 
(Sub scan)

1 - 99

50

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

$˖

˷̚˹

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

˖6,'(

$˖

˖6,'(

%˖

˖/($'B('*(6,'(

&˖

˖)5217B5($56,'(

'˖

7(67

Paper lead edge

Copy image

Image loss

3.0 1.0mm

The paper lead edge must be aligned with

the image lead edge.

DX-C401  ADJUSTMENTS  4 – 28

1)

Make a duplex copy in 100% in the RSPF 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. (For the 4.3 Inch LCD model,
press the OSA shortcut 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 RSPF 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. (For the 4.3 Inch
LCD model, press the OSA shortcut 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.

 

This adjustment is needed in the following situations:
* When the regist roller section is disassembled.
* When the LSU is replaced or removed.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.

NOTE: This adjustment is performed by the user to increase the

lead edge image position (standard value: 3mm).

1)

Enter the simulation 50-5 mode.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

2)

Select the set item K with the scroll key, and enter the value
corresponding to the paper feed tray with A4 (11" x 8.5") paper
in it.

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

A

DEN-C

Printer lead edge 
image position 
adjustment

1 - 99

30

B

DEN-B

Rear edge void area 
adjustment

1 - 99

30

C

FRONT/REAR

FRONT/REAR void 
area adjustment

1 - 99

30

D

DENB-MFT

Manual feed rear edge 
void area adjustment 
correction value

1 - 99

50

E

DENB-CS1

Tray 1 rear edge void 
area adjustment 
correction value

1 - 99

50

F

DENB-CS2

Tray 2 rear edge void 
area adjustment 
correction value

1 - 99

50

G

DENB-CS3

Tray 3 rear edge void 
area adjustment 
correction value

1 - 99

50

ǂǂǂ6,08/$7,21ǂǂ12

&/26(

$˖

˷̚˹

/($'('*($'-8670(179$/8(35,17(5

˖'(1&

$˖

˖'(1%

%˖

˖)52175($5

&˖

˖'(1%0)7

'˖

7(67

(;(&87(