MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 116

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MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 66
* 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.
5)
Select an adjustment mode with the scroll key.
(SIM50-12)
(SIM50-6)
6)
Enter an adjustment value with 10-key, and press [OK] key.
(Change for change in the adjustment value: 0.1mm/step)
(In the case of SIM50-6: When the adjustment value is
increased, the print image is shifted to the rear.)
Repeat the procedures of 2) - 6) until a satisfactory result is
obtained.
 
ADJ 16
Copy image position and image 
loss adjustment 
(Manual adjustment)
 
16-A
Copy image position, image loss, and void 
area adjustment (Manual adjustment) 
(Document table mode)
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.

NOTE: Before executing this adjustment, be sure to confirm that
the ADJ3 Print engine image skew, image position, image
magnification ratio, void area adjustments has been com-
pleted normally.
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)
Enter the SIM 50-1 mode.
3)
Set RRCA, LEAD, and SIDE to the default values.
4)
Perform the image lead edge reference position adjustment.
Shift to the copy mode, and make a copy at each of 100% and
200% in the document table mode.
When the adjustment value of RRCA is proper, the lead edge
image from 4.0mm 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 4.0mm is not copied
in either of different copy magnification ratios.)
Repeat the above procedures until a satisfactory result is
obtained.
SPF(SIDE1)
Front surface mode
SPF(SIDE2)
Back surface mode
OFFSET SPF1
Front surface mode
OFFSET SPF2
Back surface mode
Item/Display
Content
Setting 
range
Default 
value
A
Lead edge 
adjustment 
value
RRCA
Document lead 
edge reference 
position (OC)
0 - 99
50
B
Image loss 
area setting 
value
LEAD
Lead edge image 
loss area setting
0 - 99
40
C
SIDE
Side image loss 
area setting
0 - 99
20
D
Void area 
adjustment
DENA
Print lead edge 
adjustment
1 - 99
40
E
DENB
Sub scanning 
direction print 
range adjustment
1 - 99
30
F
FRONT/
REAR
FRONT/REAR void 
area adjustment
1 - 99
20
G
Off-center 
adjustment
OFFSET_
OC
OC document off-
center adjustment
1 - 99
50
H
Magnification 
ratio 
correction
SCAN_
SPEED_
OC
SCAN sub 
scanning 
magnification ratio 
adjustment (CCD)
1 - 99
50
I
Sub 
scanning 
direction print 
area 
correction 
value
DENB-
MFT
Manual feed 
correction value
1 - 99
50
J
DENB-
CS1
Tray 1 correction 
value
1 - 99
50
K
DENB-
CS2
Tray 2 correction 
value
1 - 99
50
L
DENB-
CS3
Tray 3 correction 
value
1 - 99
50
M
DENB-
CS4
Tray 4 correction 
value
1 - 99
50
N
DENB-LC
LCC/LCT/LCT 
manual paper feed 
correction value
1 - 99
50
O
DENB-
ADU
ADU correction 
value
1 - 99
55
P
DENB-HV
Heavy paper 
correction value
1 - 99
50
Display
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