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MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 24

11) Slide the CCD unit in the arrow direction (CCD sub scanning

direction) to change the installing position.
When the copy image is longer than the original scale, shift the
CCD unit in the direction B. When the copy image is shorter
than the original scale, shift the CCD unit in the direction A.
One scale of mark-off line corresponds to 0.2%.
At that time, fix the CCD unit so that it is in parallel with the
scale on the front and the rear side of the CCD unit base.
* Fix the CCD unit so that it is in parallel with the line marked

in procedure 9).

12) Make a copy and check the copy magnification ratio again.

If the copy magnification ratio is not in the range of 100 +/- 1%,
repeat the procedures of 9) - 11) until the condition is satisfied.

NOTE: By changing the CCD unit fixing position with the simula-

tion 48-1 adjustment value at 50, the copy magnification
ratio is adjusted within the specified range (100 +/- 1.0%)
and the specified resolution is obtained based on the opti-
cal system structure.

 

This adjustment must be performed in the following cases:
* When the DSPF CCD unit is replaced.
* When the DSPF CCD unit is replaced.
* When the COPY/SCAN/FAX image focus is not properly

adjusted.

* When the DSPF unit is removed.
* When the DSPF unit is replaced.
1) Make a duplex copy in DSPF mode.
2) Make sure that the copied image on the back side of the paper

is satisfactorily focused.
If the image is not satisfactorily focused, do the following
steps.

3) Open the door. Remove the screws, and remove the transport

PG upper.

4)

To prevent against shift of the CCD unit optical axis, mark the
CCD unit base as shown below.

5)

Loosen the CCD unit fixing screws (4 pcs.).

* Never loosen the screws marked with 5.

Loosening these screws could possibly change the CCD
unit base optical axis. Once the optical axis has been
changed, it cannot be corrected through on-site adjust-
ments. Solving such a problem requires the replacement of
the entire scanner unit.

6)

Slide the CCD unit in the arrow direction (CCD sub scanning
direction) to change the installing position.
When the copy image is longer than the original scale, shift the
CCD unit in the direction B. When the copy image is shorter
than the original scale, shift the CCD unit in the direction A.
One scale of mark-off line corresponds to 0.2%.
At that time, fix the CCD unit so that it is in parallel with the
scale on the front and the rear side of the CCD unit base.
* Fix the CCD unit so that it is in parallel with the line marked

in procedure 4).

7)

Make a copy and check the copy magnification ratio again.
If the copy magnification ratio is not in the range of 100 +/- 1%,
repeat the procedures of 4) - 6) until the condition is satisfied.

NOTE: By changing the CCD unit fixing position with the simula-

tion 48-1 adjustment value at 50, the copy magnification
ratio is adjusted within the specified range (100 +/- 1.0%)
and the specified resolution is obtained based on the opti-
cal system structure.
 

A

B

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 25

 

This adjustment must be performed in the following cases:
* When the registration roller section is disassembled.
* When the LSU is replaced or removed.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.

NOTE: This adjustment is performed by the user to increase the

lead edge void area to greater than the standard value
(3mm) in the printer mode.

1) Enter the SIM 50-5 mode.

2) Use the scroll key and the 10-key to enter the value corresponding to the paper feed tray where there is A4 (11" x 8.5") paper.

EXECUTE 

End of print

EXECUTE 

10-key

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2.

A

DEN-C

Printer print lead edge adjustment

1 - 99

30

Adjustment value for fitting the print lead edge for the printer
When the adjustment value of this item is decreased by 1, the 
printer print start position in the paper transport direction is 
shifted to the lead edge by 0.1mm.

B

DEN-B

Sub scanning direction print range 
adjustment

1 - 99

30

Void amount generated at the paper rear edge.
When the adjustment value of item B (DEN-B) is decreased by 
1, the print area adjustment value in the sub scanning direction 
for the paper transport direction is decreased by 0.1mm.

C

FRONT/REAR

FRONT/REAR void area 
adjustment

1 - 99

20

The void amount made at the right and the left edges of paper 
is adjusted. When the value is increased, the void amount is 
increased.

D

DENB-MFT

Manual feed correction value

1 - 99

50

E

DENB-CS1

Tray 1 correction value

1 - 99

50

F

DENB-CS2

Tray 2 correction value

1 - 99

50

G

DENB-CS3

Tray 3 correction value

1 - 99

50

H

DENB-CS4

Tray 4 correction value

1 - 99

50

I

DENB-LCC/LCT

LCC/LCT/LCT manual paper feed 
correction value

1 - 99

50

J

DENB-ADU

ADU correction value

1 - 99

55

K

DENB-HV

Heavy paper correction value

1 - 99

50

L

MULTI COUNT

Number of print

1 - 999

1

M

PAPER

MFT

Tray 
selection

Manual paper feed

1 - 9

1

2(CS1)

CS1

Tray 1

2

CS2

Tray 2

3

CS3

Tray 3

4

CS4

Tray 4

5

LCC

LCC (*1)

6

LCT1_1

LCT first series first 
stage (*2)

6

LCT1_2

LCT first series 
second stage (*2)

7

LCT2_1

LCT second series, 
first stage (*3)

8

LCT2_2

LCT second series, 
second stage (*3)

9

N

DUPLEX

YES

Duplex print 
selection

Select

0 - 1

0

1(NO)

NO

Not select

1

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 26

*1: Displayed only when A4/A3 LCC is connected.
*2: Displayed only when 2-stage LCT is installed.
*3: Displayed only when two units of 2-stage LCT are connected.
 

3) Press [EXECUTE] key.

The adjustment pattern is printed.

4) Measure the distance from the paper lead edge the adjustment

pattern to the image lead edge, and check to confirm that it is
in the standard adjustment value range.
Standard adjustment value: 4.0 +/- 1.0mm

If the above requirement is not met, do the following steps.

5) Select the adjustment target of the paper feed mode adjust-

ment item DENC with the scroll key.

6) Change the adjustment value.

Enter the adjustment value and press the [OK] key or the
[EXECUTE] key.
When [EXECUTE] key is pressed, the adjustment pattern is
printed.
When the adjustment value is increased, the distance from the
paper lead edge to the image lead edge is increased. When
the adjustment value is decreased, the distance is decreased.
When the set value is changed by 1, the distance is changed
by about 0.1mm.

Repeat the procedures 4) - 6) until the condition of 4) is satisfied.

4.0 1.0mm

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 27

 

* Requisite conditions before execution of the color balance/den-

sity adjustment
Before execution of the color balance/density adjustment, check
to insure that the adjustments which affect the color balance/den-
sity have been completed properly.
The importance levels of them are shown below.

Since the following items affect the color balance/density
directly, they must be adjusted or set before execution of the
image quality adjustments.
1) The following adjustment items must be adjusted properly.

Though the following items affect the color balance/density,
there is no need to adjust them frequently. When, however, a
trouble occurs, they must be checked and adjusted.
1)  The following items must be adjusted properly.

Note for the color balance/density check and adjustments
-  For the color balance adjustments, be sure to use the paper

specified for color (recommended paper).
Note that, if another kind of paper is used for the color balance
adjustment, proper image qualities (color balance, density) may
not be obtained.

-  When setting the adjustment pattern on the document table in the

automatic color balance adjustment procedures, place 5 sheets
of white paper on the adjustment pattern in order to prevent back
copying and adverse effects of paper wrinkles as far as possible.

Note that the jobs before and after execution of the color balance/
density check and adjustment depend on the machine status and
the servicing conditions.
Follow the flowchart of the color balance/density adjustment proce-
dures depending on the actual conditions.
There are following four, major cases.
1) When a periodic maintenance is performed.
2) When a repair, an inspection, or a maintenance is performed.

(When a consumable part is replaced.)

3) When an installation, a repair, or inspection is performed.

(Without replacement of a consumable part)

CAUTION: Before checking the copy color balance and density, be

sure to execute the following jobs.

* Execute the high density image correction (Process correction)

forcibly. (SIM 44-6)

* Execute the half-tone image correction forcibly. (SIM 44-26)

Method 1
Make a copy of the gray test chart (UKOG-0162FCZZ) and a copy
of the servicing color test chart (UKOG-0326FCZZ/UKOG-
0326FC11), and check that they are proper.

in the color copy mode
To check the copy color balance and density, use the gray test
chart (UKOG-0162FCZZ) and the servicing color test chart
(UKOG-0326FCZZ/UKOG-0326FC11). Set the copy density
level to "3" in the Text/Printed Photo mode (Manual), and make
a copy.
At that time, all the color balance adjustments in the user
adjustment mode must be set to the default (center).
In addition, be sure to use the specified paper for color.

To check the density, use the gray test chart (UKOG-
0162FCZZ). Set the copy density level to "Manual 3" in the Text/
Printed Photo mode (Manual).
In addition, all the color balance adjustments in the user
adjustment mode must be set to the default (center).

Check with the gray test chart (UKOG-0162FCZZ)
In the copy density check with the gray test chart, check to insure
the following conditions.

CAUTION: For the color (gray) balance, use the servicing color test

chart (UKOG-0326FCZZ/UKOG-0326FC11) to check.

Check with the servicing color test chart (UKOG-0326FCZZ/
UKOG-0326FC11)
In the copy color balance check with the servicing color test chart,
check to insure the following conditions.

ADJ 

4

Print engine image distortion adjustment / OPC drum 
phase adjustment / Color registration adjustment 
(Print engine section)

50-20/22

ADJ 

1

Adjust the 
developing unit

ADJ 

1A

Adjust the developing 
doctor gap

ADJ 

1B

Adjust the developing 
roller main pole position

ADJ 

1C

Toner density control 
reference value setting

25-2

ADJ 

2

High voltage 
adjustment

ADJ 

2A

Adjust the main charger 
grid voltage

8-2

ADJ 

2B

Adjust the developing 
bias voltage

8-1

ADJ 

2C

Transfer current/voltage 
adjustment

8-6

ADJ 

7

Scan image focus adjustment

48-1

1

2

3

4

5

6

7

8

9

10

W

SHARP   GRAY CHART

SHARP gray chart

Patch 1 is
slightly copied.

Patch 2 is copied.

(Color copy)

1

2

3

4

5

6

7

8

9

10

W

SHARP   GRAY CHART

SHARP gray chart

Patch 1 is not copied.

Patch 2 is
slightly copied.

Patch 3 is copied.

(Black-and-white copy)

Serviceman chart (Color patch section)

The densities of patches 1 - 6 of
each color are properly balanced.

Patch 7 is slightly
copied or not copied.

(Color copy)