MX-M850 (serv.man36). Section 6 Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 18

MX-M1100  ADJUSTMENTS  6 – 18

3)

Select a paper feed tray with A3 (11 

✕ 17) paper in it.

4)

Press [EXECUTE] button.
The grid pattern image is printed.

5)

Check to confirm that the printed grid pattern is virtually in par-
allel with the paper edges, and put the position marks A and B
on the front and the rear side of the front surface and the back
surface of paper.

6)

Make a copy of the adjustment pattern made in the above pro-
cedure on A3 (11 

✕ 17) paper in the DSPF duplex mode, and

check for any image distortion  (skew). (Set the adjustment 
pattern so that the marked side is on the lead edge side.)
Check in one of the following methods:
[Check method 1]

[Check method 2]
Check to confirm that the right angle degrees of the print lines
in the main scanning direction are within 1.0mm with the paper
longitudinal direction print line as the reference. 

If the front surface copy image satisfies the above condition
the back surface copy image does not, go to "ADJ 5C DSPF
skew adjustment  (Back surface mode)."
If the front surface copy image does not satisfy the above con-
dition, perform the following procedure. 

7)

Loosen the hinge section screw, and lower two metal plates
which lock the DSPF.
Then the DSPF unit can be opened at an angle of 90 degrees.

8)

Open the DSPF unit, and loosen the hinge section fixing screw
on the right side of the DSPF unit.

9)

Turn the DSPF skew adjustment screw on the left side when
viewed from the rear frame to minimize the skew.

Repeat the procedures 6 thru 9 until a satisfactory result is
obtained. 

pass

Paper

direction

a

b

c

d

(Back side)

|c-d|

1 mm

(Front side)

|a-b|

1 mm

satisfied:

Condition that should be

satisfied:

Condition that should be

1

When the main scanning direction print line 
inclines to the left (Adjustment pattern a < b)

Turn the DSPF skew 
adjustment screw 
counterclockwise.

When the main scanning direction print line 
inclines to the right (Adjustment pattern a > b)

Turn the DSPF 
adjustment screw 
clockwise.