MX-2640N, MX-2640NR, MX-2640FN, MX-3140N, MX-3140NR, MX-3140FN, MX-3640N, MX-3640NR, MX-3640FN (serv.man9). Service Manual Revised June 2014. - Sharp Copying Equipment Service Manual (repair manual). Page 124

MX-3640N  ADJUSTMENTS AND SETTINGS  5 – 81

* 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  SPF r ear  edge  image  loss setting is provided for

countermeasures  against  the ca se  when  shades  are

produced.

5) Select an adjustment mode with the scroll key.

6) Enter an adjustment value with 10-key, and press [OK] key.

(Change for change in the adjustment value: 0.1mm/step)
(When  the a djustment  value  is in creased,  the  print  image is

shifted to the rear.)

Repeat  the pr ocedures  of 2) - 6)   until  a sat isfactory  result is

obtained.

 

Normally if the adjustment is executed by ADJ 4 (automatic adjust-

ment), there is no need to execute this adjustment.
Only when the manual adjustment is required, execute this adjust-

ment.
In other words, this manual ad justment is executed when a satis-

factory result is not  obtained from the automatic adjustment (ADJ

4).

 

This adjustment must be performed in the following cases:
* 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.

Before executing this  adjustment, be sure to confirm th at the ADJ

4/ADJ 5 Print engine image skew, image position, image magnifica-

tion ratio, void area adjustments has been completed normally.
1) Place  a sca le  on  the document t able  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.

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

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

40

I

OFFSET_SPF1

RSPF front surface 

document off-center 

adjustment

1 - 99

50

J

OFFSET_SPF2

RSPF back surface 

document off-center 

adjustment

1 - 99

50

K SCAN_SPEED_SPF1

RSPF document 

front surface 

magnification ratio 

adjustment (Sub 

scan)

1 - 99

50

L

SCAN_SPEED_SPF2

RSPF document 

back surface 

magnification ratio 

adjustment (Sub 

scan)

1 - 99

50

SPF(SIDE1)

Front surface mode

SPF(SIDE2)

Back surface mode

OFFSET SPF1

Front surface mode

OFFSET SPF2

Back surface mode