MX-M364N, MX-565N (serv.man4). Service Manual (Revised January 2016). - Sharp Copying Equipment Service Manual (repair manual). Page 43

MX-M565N  ADJUSTMENTS AND SETTINGS  4 – 13

5)

Without moving the scanner unit drive shaft, manually turn the
scanner unit drive pulley to change the parallelism of the scan-
ner unit A and B. (Change the relative position of the scanner
unit drive pulley and the drive shaft.)

6)

Tighten the scanner unit drive pulley fixing screw.

Repeat the procedures 2) - 6) until the condition of the procedure 3)
is satisfied. If the distortion in the sub scanning direction cannot be
deleted with the above procedures, perform ADJ 4D Scan image
distortion adjustment (Whole scanner unit).

 

1)

Make a test chart on A3 (11" x 17") paper as shown below.
(Draw a rectangular with four right angles.)

2)

Set the test chart prepared in the procedure 1) on the docu-
ment table, and make a copy on A3 (11" x 17") paper.

3)

Check for distortion in the main scanning direction.

If the four angles of the rectangle of the copy image are right
angles, it is judged that there is no distortion. (The work is
completed.)

If there is any distortion in the main scanning direction, perform
the following procedure.

4)

Check the difference (distortion balance) between left-hand
and right-hand side images distortions.

If Lc = Ld, the distortion on the left is equal to that on the right.
(The distortions are balanced.) If the above condition is satis-
fied, go to the procedure 6). If not, perform the following proce-
dures.

5)

Change the height balance of the scanner rail on the front
frame side.

Remove the lower cabinet of the operation panel. Loosen the
scanner rail fixing screw to change the balance between the
right and the left heights of the scanner rail. Repeat the proce-
dures 2) - 5) until the difference between the image distortions
(distortion balance) is deleted.

6)

Without changing the balance of the scanner rail on the front
frame side, change the overall height.

7)

Set the test chart prepared in the procedure 1) on the docu-
ment table, and make a copy on A3 (11" x 17") paper. Check
that the distortion in the main scanning direction is within the
specified range. Repeat the procedures 6) and 7) until the dis-
tortion in the main scanning direction is in the specified range.

If the distortion in the sub scanning direction cannot be deleted
with the above procedures, perform ADJ 4D Scan image dis-
tortion adjustment (whole scanner unit).

 

This adjustment is executed when scan image distortion cannot be
adjusted with ADJ 4A, ADJ 4B, and ADJ 4C related to the scan
image distortion adjustment.

Change the upper and lower positions of the scanner unit distortion
adjustment plate on the right edge of the scanner unit so that the
scan image distortion is minimized. By adjusting the distortion of
the whole scanner unit, the scan image distortion is adjusted.

1)

Loosen the fixing screw (A).

2)

Adjust the scanner unit distortion adjustment plate.

L

L

L = 10mm

L

L

Lc

Ld

Copy A

Lc

Ld

Copy B

There is no difference
between the distortion on
the right and that on the left.

Lc     Ld

Lc     Ld

There is some difference
between the distortion on
the right and that on the left.