MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 118

MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 68

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)

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.

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

F

L

R

FACE

BACK

R

T

F

L

T

Draw arrows.

Draw arrows.

Put the position 

marks.

Put the position 

marks.

Paper lead edge

Copy image

Image loss 

4.0    1.0mm

The paper lead edge must be aligned with 

the image lead edge.