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 127

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MX-3640N  ADJUSTMENTS AND SETTINGS  5 – 84
* Item A, B: When the adjustment value is increased, the scan 
timing is delayed.
* Item  C -   H: When  the  adjustment valu e  is increased, the
image loss is increased.
* Item A - H: 1 step = 0.1mm change
* The RSPF rear edge image loss setting is provided for coun-
termeasures against the case when shades are produced.
(Lead edge image loss adjustment)
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)
TRAIL EDGE (SIDE 1): 
40 Lead edge image loss set value (Front surface)
TRAIL 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  RSPF  mode.  Check  to
confirm that the lead edge image loss is within 4.0  1.0mm on
the front surface and the back surfa ce. The paper lead edge
must be aligned with the presumed image lead edge.
If  the  above  condition  is  not  satisfied, p erform  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 procedur es  of 2)   - 3) until a satisfactor y  result  is
obtained.
(Rear edge image loss adjustment)
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, p erform  the  following
procedure.
Item/Display
Content
Setting 
range
Default 
value
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
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
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