MX-6580N, MX-7580N (serv.man3). Service Manual (Revised June 2017). - Sharp Copying Equipment Service Manual (repair manual). Page 119

MX-7580N  ADJUSTMENTS AND SETTINGS  5 – 69

1)

Make a duplex copy in 100% in the DSPF 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, perform the following
procedure.

2)

Enter the adjustment value of TRAIL EDGE (SIDE1/SIDE2)
with 10-key, and press [OK] key.

TRAIL EDGE (SIDE 1): 

Rear edge image loss adjustment value (Front surface)

TRAIL EDGE (SIDE 2): 

Rear edge image loss adjustment value (Back surface)

(When the adjustment value is increased, the rear edge image
loss is increased.)

(Change for change in the set value: 0.1mm/step)

Perform the procedures of 1) - 2) until a satisfactory result is
obtained.

1)

Make a duplex copy in 100% in the DSPF mode. Check to
confirm that the image losses on the front frame side and the
rear frame side are 2.0 +/- 2.0mm on the front surface and the
back surface.

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

2)

Enter the adjustment value of FRONT/REAR (SIDE 1) /
FRONT/REAR (SIDE 2), and press [OK] key.

FRONT/REAR (SIDE 1): 

Front/Rear image loss adjustment value (Front surface)

FRONT/REAR (SIDE 2): 

Front/Rear image loss adjustment value (Back surface)

(When the adjustment value is increased, the front/rear image
loss is increased.)

(Change for change in the adjustment value: 0.1mm/step)

Perform the procedures of 1) - 2) until a satisfactory result is
obtained.

Paper rear edge

Copy image

Image loss 2.0 - 5.0mm

Paper F 

side edge

Paper R 

side edge

Copy image

Copy image

Image loss 

2.0    2.0mm

Image loss 

2.0    2.0mm