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MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 13

5)

Fix the pulley angle on the front frame side of the scanner unit
B.
If a satisfactory result is not obtained from the above proce-
dures, perform the following procedures.
Loosen the fixing screw of the scanner unit drive pulley which
is not in contact.
Without moving the scanner unit drive shaft, turn the scanner
unit drive pulley manually and adjust so that the scanner unit B
is in contact with both stoppers on the front frame and the rear
frame simultaneously. (Change the relative position of the
scanner unit drive pulley and the drive shaft.) Fix the scanner
unit drive pulley fixing screw.

6)

With the scanner unit B in contact with both stoppers, fit the
edge of the scanner unit A with the right edge of the frame, and
fix the scanner unit A with the fixing screw.

 

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. (Shift the test chart edge 30mm from the reference
position as shown below.) With the document cover open,
make a copy on A3 (11" x 17") paper.

3)

Check for distortion in the sub scanning direction.
If La = Lb, there is no distortion.

If there is any distortion in the sub scanning direction, perform
the following procedures.

4)

Loosen either one of the fixing screws of the scanner unit drive
pulley. (Either one on the front frame or on the rear frame will
do.)

L

L

L = 10mm

L

L

La

Lb

MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 14

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 satisfied, go to the procedure 6).
If not, perform the following procedures.

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 procedures 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 distortion 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.

MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 15

 

 

1)

Make an DSPF/RSPF parallelism adjustment sheet.
Cut copy paper in the longitudinal direction.

2)

Perform the adjustment according to the flowchart below.

<Flow chart>

<Work procedure>
a) Check section A.

Yes

No

Adjust hinge D

until there is a

resistance in

section A.

(Counter-

clockwise)

*

Check to insure that a slight resistance is felt when pulling out

the DSPF/RSPF height adjustment sheet.

Slowly pull out the DSPF/RSPF height adjustment sheet.

Place the DSPF/RSPF height adjustment sheet between

section A and the DSPF/RSPF glass height adjustment resin

surface (a), and close the DSPF/RSPF unit.

b) If it cannot be pulled out, loosen the fixing nut and turn the

section D clockwise to lift the DSPF/RSPF unit, and make an

adjustment.
If it can be pulled out without resistance, loosen the fixing nut

and turn the section D counterclockwise to move down the

DSPF/RSPF unit, and make an adjustment.

Be careful not to cover the convex section of the glass

holding resin surface with the height adjustment sheet.

Start of the

adjustment

Check section A.

Is

there a resist-

ance?

The section

A is lowered

too much.

Turn the hinge

D to lift the

DSPF/RSPF

so that

there is a

resistance in

the section A.

(Clockwise)

MX-M503N  ADJUSTMENTS AND SETTINGS  4 – 16

Is there a

resistance in the

section B?

Yes

No

Increase the

clearance in

the section F

until there is a

resistance in

the section B.

However, the

max. is 5.0mm.

c) Adjust the section F.

*

If not, loosen the fixing nut and turn the section E to adjust.

Use a clearance gauge to check to confirm that the clearance

in the section F is 4.3mm - 5.0mm.

Turn section E clockwise to lift the DSPF/RSPF unit. Turn it

counterclockwise to move down the DSPF/RSPF unit.

* Insert a clearance gauge in the range of 20mm from the

edge (a) of the OC mat.

Adjust the

section F.

Section

F