MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 115

MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 65

2)

Check the copy image center position.

If A - B = +/- 1.0mm, the adjustment is not required.

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

3)

Enter the SIM 50-12 mode.

4)

Select the adjustment mode OC with the scroll key.

5)

Enter the adjustment value with 10-key, and press [OK] key.

The entered value is set.

When the set value is increased, the main scanning print posi-
tion is shifted to the front side by 0.1mm.

6)

Go to the copy mode, and make a copy.

Repeat the procedures of 1) - 6) until the above condition is satis-
fied.
 

 

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.

CAUTION: To execute this adjustment, it is required that the

ADJ15A Scan image off-center adjustment (Document
table mode) must have been properly adjusted.

1)

Prepare the adjustment chart.

Draw a line at the center of the front surface and the back sur-
face of A4 (11" x 8.5") paper in parallel with the paper transport
direction.

2)

Set the adjustment chart to the DSPF.

3)

Make a duplex copy in the normal magnification ratio from the
manual paper feed tray, and check the image position on the
front surface and the back surface of the copy paper.

If the difference is within the range of 0 +/- 2.7mmm there is no
need to perform the adjustment.

If the adjustment is required, perform the following procedures.

4)

Enter the SIM 50-12 or 50-6 mode.

A - C: When the adjustment value is increased, the image
position is shifted to the rear frame side.

1step = 0.1mm

B'

A' - B' =  1.0mm

A'

(100%)

Paper transport direction

Front surface

Back surface

Draw a line at the center of the 

front surface and the back surface 

of paper in parallel with the paper 

transport direction.

A

OC

Document table image off-
center adjustment

1 - 99

50

B

SPF(SIDE1)

SPF front surface image off-
center adjustment

1 - 99

50

C

SPF(SIDE2)

SPF back surface image off-
center adjustment

1 - 99

50

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

original

copy

a

b