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MX-2300/2700 N/G  ADJUSTMENTS  6 – 8

 

There are some assembly variations in the image density sensor
section. Therefore, the absolute detection level differs in each
machine. To correct this, calibration is executed.
This adjustment must be executed in the following cases:
* When the image density sensor is replaced.
* When the image resist sensor is replaced.
* When U2 trouble occurs.
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
The targets of the adjustment are the color image density sensor,
the black image density sensor, and the image registration sensor.
There are following adjustment methods.
* Color image density sensor adjustment (Calibration with the

adjustment jig) SIM44-13

* Black image density sensor and the image registration sensor

adjustment SIM44-2

NOTE: Before executing this adjustment, check to confirm the fol-

lowing items.

* Check to confirm that the color image density sensor, the black

image density sensor, and the image registration sensor are
clean.

* Check to confirm that the image density sensor calibration plate

is clean.

* Check to confirm that the transfer belt is clean and free from

scratches.

 

1) Open the front cabinet of the main unit, and remove the waste

toner box.

2) Remove the primary transfer unit fixing screw.

3) Turn to the transfer belt tension release cam and release the

primary transfer belt tension.

NOTE: When the transfer belt tension of the primary transfer
unit is released manually, turn on the power again after com-
pletion of the work. (Power OFF-ON) This procedure initializes
the transfer roller to return it to the home position.

4)

Open the right cover unit (secondary transfer unit section).

5)

Open the process front cover, and pull out the primary transfer
belt unit.

6)

Install the image density sensor calibration jig (UKOG-
0318FCZZ) to the sensor housing section.
Engage the pawl (A) in the sensor housing groove, and slide it
to the rear frame side.

7)

Turn on the power and enter SIM44-13 mode.

8)

Close the right cover unit (secondary transfer unit section). 

9)

Install the waste toner bottle to the main unit.

10) Close the front cabinet.
11) Press [EXECUTE] key.

Color image sensor calibration is automatically executed.
When the operation is completed, the adjustment result is dis-
played and [EXECUTE] key returns to the normal display.

EXECUTE

EXECUTE

0

SIMULATION㩷 NO.44-13

TEST

PATCH SEAL ADJUSTMENT

EXECUTE

xxx

:

PCS CL DARK

xxx

:

xxx

xxx

xxx

xxx

:

1/1

CLOSE

0

SIMULATION㩷 NO.44-13

TEST

PATCH SEAL ADJUSTMENT

EXECUTE

PCS CL CARB OUT :

PCS CL DARK

:

PCS CL LED ADJ

:

1/1

CLOSE

or when the color sensor

adjustment is completed

PCS CL CARB OUT

PCS CL LED ADJ

: Feb. 15 2006

MX-2300/2700 N/G  ADJUSTMENTS  6 – 9

If the adjustment is not completed normally, "ERROR" is displayed.
In that case, check the following sections for any abnormality. If any
abnormality is found, repair and adjust again.
If an error occurs, the adjustment result is not revised.
* Color image density sensor
* PCU PWB
* Image sensor calibration jig (standard reflection sheet dirt,

scratch, discoloration)

NOTE: Store the image sensor calibration jig under low tempera-

ture, low humidity and dark place.

 

1)

Enter SIM44-2 mode.

2)

Press [EXECUTE] key.
The color image density sensor, the black image density sen-
sor, and the image registration sensor are automatically
adjusted.
After completion of the adjustment, the adjustment result is
displayed and [EXECUTE] key returns to the normal display.

If the adjustment is not completed normally, "ERROR" is dis-
played.
In that case, check the following sections for any abnormality.
If any abnormality is found, repair and adjust again.
If an error occurs, the adjustment result is not revised.

* Color image density sensor
* Black image density sensor
* Image registration sensor
* PCU PWB
* Transfer belt (dirt, scratch)
* Transfer belt cleaner

A

PCS_CL 
CARB OUT

Color image density sensor 
LED current adjustment 
target value

1 – 255

108

B

PCS_CL 
DARK

Color image density sensor 
dark-voltage level 

0 – 255

0

C

PCS_CL 
LED ADJ

Color image density sensor 
LED current adjustment 
target value (PCS CL CARB 
OUT) registered LED current 
level

1 – 255

21

0

SIMULATION NO.44-02

TEST

PROCON GAIN ADJUSTMENT

EXECUTE

PCS_CL LED ADJ

xx

:

PCS_㧷 GRND

xx

:

PCS_㧷 LED ADJ

xx

:

PCS_K BELT MAX

xx

:

PCS_CL DARK

xx

:

PCS_KBELTMIN

xx

:

PCS_K DARK

xx

:

PCS_KBELTDIF

xx

:

1/4

CLOSE

PRO CON

A

PCS_CL LED ADJ

Color image density sensor light emitting quantity adjustment value

1 – 255

21

B

PCS _K LED ADJ

Black image density sensor light emitting quantity adjustment value

1 – 255

21

C

PCS_CL DARK

Color image sensor dark voltage

0 – 255

0

D

PCS_K DARK

Black image density sensor dark voltage

0 – 255

0

E

PCS_K GRND

Belt base detection level when completion of Item B adjustment 

0 – 255

0

F

PCS_K BELT MAX

Belt base detection level (Max.)

0 – 255

0

G

PCS_K BELT MIN

Belt base detection level (Min.)

0 – 255

0

H

PCS_K BELT DIF

Belt base detection level difference (Item F – Item G)

0 – 255

0

REGIST

I

REG_F LED ADJ

Image registration sensor light emitting quantity adjustment value F

1 – 255

56

J

REG_R LED ADJ

Image registration sensor light emitting quantity adjustment value R

1 – 255

56

K

REG_F DARK

Image registration sensor dark voltage F

0 – 255

0

L

REG_R DARK

Image registration sensor dark voltage R

0 – 255

0

M

REG_F GRND

Belt base detection level when completion of Item I adjustment 

0 – 255

0

N

REG_R GRND

Belt base detection level when completion of Item J adjustment

0 – 256

0

O

REG_F BELTMAX

Belt base detection level (Max.) F

0 – 255

0

P

REG_F BELT MIN

Belt base detection level (Min.) F

0 – 255

0

Q

REG_F BELT DIF

Belt base detection level difference (Item O – Item P)

0 – 255

0

R

REG_R BELT MAX

Belt base detection level (Max.) R

0 – 255

0

S

REG_R BELT MIN

Belt base detection level (Min.) R

0 – 255

0

T

REG_R BELT DIF

Belt base detection level difference (Item R – Item S)

0 – 255

0

U

REG_F PATCH (K)

Patch detection level  F (K)

0 – 255

0

V

REG_F PATCH (C)

Patch detection level  F (C)

0 – 255

0

W

REG_F PATCH (M)

Patch detection level  F (M)

0 – 255

0

X

REG_F PATCH (Y)

Patch detection level  F (Y)

0 – 255

0

Y

REG_R PATCH (K)

Patch detection level  R (K)

0 – 255

0

Z

REG_R PATCH (C)

Patch detection level  R (C)

0 – 255

0

AA

REG_R PATCH (M)

Patch detection level  R (M)

0 – 255

0

AB

REG_R PATCH (Y)

Patch detection level  R (Y)

0 – 255

0

MX-2300/2700 N/G  ADJUSTMENTS  6 – 10

 

This adjustment must be executed in the following cases:
* When the LSU (writing) unit is replaced.
* When the LSU (writing) unit is removed from the main unit.
* When a color image registration mistake occurs.
* When the unit is installed or when the installing site is changed.

(Required depending on the cases.)

* When there is an uneven density area or a difference in color

balance in the main scanning direction (back and forth).

* When the OPC drum drive unit is replaced.
* When the primary transfer unit is replaced.
* When the color phase is not matched by the color balance

adjustment.

1) Enter SIM61-4 mode.

2) Select the paper feed tray with A3 (11 x 17) paper in it by

changing the value of set item B.

3) Press [EXECUTE] key.

The check pattern is printed out.

4) Check the printed black image for any skew (right angle).

Measure the right angle level by using the six cross patterns
printed in black.
There are following two methods of checking the black image
for any skew (right angle).
Method 1: Measure the length of the diagonal lines from the
cross point of the cross pattern. Check the difference in the
length of the diagonal lines for judgment of good or no good.

Method 2: Use the right angle sides of A3 or 11 x 8.5 paper for
judgment of good or no good.
NOTE:
IN the case of Method 2, the right angle of paper to be used
may not be exact. Be sure to check the right angle of paper to
be used in advance.
(Method 1)
a) Measure the length of the diagonal lines from the cross 

point of the outside cross pattern.

b) Calculate the difference between the measured lengths C 

and D of the diagonal lines.

c) Check to insure that the difference between C and D is in 

the following range.

C – D = 

± 0.8mm

If the difference between C and D is in the above range, 
there is no need to adjust.

(Method 2)
a) Fit the three cross points of the cross patterns in a row with 

the side of A3 or 11 x 8.5 paper for checking for any skew 
(right angle).

b) Measure the shortest distance between the cross pattern 

on the extended line of the vertical line and the paper side.
If the above distance is 0.5mm or less, there is no need to 
adjust.

If not, execute the following procedures.

5)

Open the front cabinet, and remove the waste toner box.

EXECUTE

EXECUTE

CLOSE

0

A:

Aȇxxx

Ȉ

MULTICOUNT

Bȇ x

Ȉ

PAPERȇCS1

SIMULATIONġ NO.61-04

LSU POSITION ADJUSTMENT (SELF PRINT)

xxx

1

999

OK

TEST

EXECUTE

0

SIMULATION NO.61-04

OK

TEST

CLOSE

EXECUTE

A:

Aȇxxx

Ȉ

MULTICOUNT

Bȇ x

Ȉ

PAPERȇCS1

LSU POSITION ADJUSTMENT (SELF PRINT)

2

1 999

10-key

or end of print

R

F

Comparison line

0.5 mm or less

Direction A

Direction B

Reference line

R

F

Diagonal line D

Diagonal line C

Direction A

Direction B

R

F

Comparison line

A3 or 11 x 8.5 paper

The cross patterns in a row

Reference line

0.5 mm or less

: Jan. 15 2006

MX-2300/2700 N/G  ADJUSTMENTS  6 – 11

6) Loosen the LSU (writing) unit fixing screws (2 pcs.) and shift

the skew adjustment screw in the arrow direction to adjust the
LSU (writing) unit skew.
(When Method 1 is used to check the black image for any
skew (right angle) in procedure 4)
When the lengths of the diagonal line are C > D, shift the
adjustment screw in the direction of Y.
When the lengths of the diagonal line are C < D, shift the
adjustment screw in the direction of X.
(When Method 2 is used to check the black image for any
skew (right angle) in procedure 4)
If the image is skewed in the arrow direction of A, shift the
adjustment screw to X direction. If the image is skewed in the
arrow direction of B, shift the adjustment screw to Y direction.

7) Install the waste toner box, and close the front cabinet.
8) Execute procedures 3) – 4).

(Repeat procedures 5) – 8) until a satisfactory result is
obtained.)

9) If the adjustment result reaches the satisfactory level, tighten

the adjustment screw.
(The black image skew adjustment is completed with the
above.)

10) In the above black image skew adjustment, check the color

image skew pattern printed when completion of the adjust-
ment.

In each Y/M/C color print pattern printed separately in the front
frame direction and in the rear frame direction, note the same
print color pattern and check to confirm that the difference in
the highest density sections is within 

± 1 step.

(Compare the front and the rear frame positions of the same-
color print color patterns. All the highest density sections of all
the print color patterns may not be aligned on a line. Compare
only the same-color patterns.)
If the above condition is not satisfied, execute the procedures
below.

11) Turn the image skew adjustment screw of the target color to

adjust.

When each adjustment screw is turned, it clicks. Turn it by
5 – 6 clicks and the check pattern is changed by 1 step (1
dot size).
When the image skew pattern on the front frame side is
skewed in the arrow direction of A (to the smaller character)
from the rear frame side, turn the adjustment screw counter-
clockwise. When the image is skewed in the arrow direction of
B (to the larger character), turn the adjustment screw clock-
wise.

12) Print the check pattern.
13) Check the color image skew pattern.
Repeat procedures 11) – 13) until a satisfactory result is obtained.
The image skew adjustment (LSU unit) is executed by changing
the parallelism of the LSU unit scan laser beam for the OPC drum.

 

This adjustment must be executed in the following cases:
* When the OPC drum is replaced.
* When the OPC drum is removed from the main unit.
* When the OPC drum drive section is disassembled.
* When the OPC drum drive unit is replaced.
* When U2 trouble occurs.
* When the PCU MAIN PWB is replaced.
* When EEPROM on the PCU MAIN PWB is replaced.

X

Y

R

F

*A

*A: Rough adjustment pattern

*B

*B: Fine adjustment pattern

*B

Direction A

Direction B

Magenta

Cyan

Yellow

: Jan. 15 2006