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MX-7000N  ADJUSTMENTS  6 – 9

2)

Select a mode to be adjusted with the scroll key.

3)

Enter an adjustment value (specified value) and press [OK] key.
By setting the default value (specified value), the specified voltage is outputted.
When [EXECUTE] key is pressed, the transfer voltage is outputted.

 

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

* Color/black image density sensor and the image registration sen-

sor adjustment SIM44-2

NOTE:
Before executing this adjustment, check to confirm the following
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.

A

TC1 LOW SPEED CL K

Primary 
transfer bias 
reference value

Color

K

Lower speed

0 - 255

78

2

µA - 100µA

15

µA

B

TC1 MIDDLE SPEED CL K

Middle speed

0 - 255

78

2

µA - 100µA

15

µA

C

TC1 LOW SPEED CL C

C

Lower speed

0 - 255

68

2

µA - 100µA

10

µA

D

TC1 MIDDLE SPEED CL C

Middle speed

0 - 255

68

2

µA - 100µA

10

µA

E

TC1 LOW SPEED CL M

M

Lower speed

0 - 255

68

2

µA - 100µA

10

µA

F

TC1 MIDDLE SPEED CL M

Middle speed

0 - 255

68

2

µA - 100µA

10

µA

G

TC1 LOW SPEED CL Y

Y

Lower speed

0 - 255

68

2

µA - 100µA

10

µA

H

TC1 MIDDLE SPEED CL Y

Middle speed

0 - 255

68

2

µA - 100µA

10

µA

I

TC1 LOW SPEED BW K

Black and white

K

Lower speed

0 - 255

78

2

µA - 100µA

15

µA

J

TC1 MIDDLE SPEED BW K

Middle speed

0 - 255

78

2

µA - 100µA

15

µA

K

TC1 HIGH SPEED BW K

High speed

0 - 255

130

2

µA - 100µA

40

µA

L

TC2 PLAIN CL SPX

Secondary 
transfer bias 
reference value

Color

Normal 
paper

Front surface

51 - 255

132

2

µA - 60µA

25

µA

M

TC2 PLAIN CL DPX

Back surface

51 - 255

132

2

µA - 60µA

25

µA

N

TC2 PLAIN BW SPX

Black and white

Front surface

51 - 255

184

2

µA - 60µA

40

µA

O

TC2 PLAIN BW DPX

Back surface

51 - 255

184

2

µA - 60µA

40

µA

P

TC2 HEAVY CL SPX

Color

Heavy 
paper

Front surface

51 - 255

88

2

µA - 60µA

12.5

µA

Q

TC2 HEAVY CL DPX

Back surface

51 - 255

88

2

µA - 60µA

12.5

µA

R

TC2 HEAVY BW SPX

Black and white

Front surface

51 - 255

79

2

µA - 60µA

10

µA

S

TC2 HEAVY BW DPX

Back surface

51 - 255

79

2

µA - 60µA

10

µA

T

TC2 OHP CL

Color

OHP

51 - 255

72

2

µA - 60µA

8

µA

U

TC2 OHP BW

Black and white

51 - 255

72

2

µA - 60µA

8

µA

V

TC2 ENVELOPE CL

Color

Envelope

51 - 255

149

2

µA - 60µA

30

µA

W

TC2 ENVELOPE BW

Black and white

51 - 255

149

2

µA - 60µA

30

µA

X

TC2 CLEANING

Cleaning process

51 - 255

72

2

µA - 60µA

8

µA

Y

TC2 CLEAN LOW SPD

Secondary 
transfer 
cleaning bias 
reference value

Printing at low speed

51 - 255

72

–50V - –1500V

–200V

Z

TC2 CLEAN MIDDLE SPD

Printing at middle speed

51 - 255

100

–50V - –1500V

–400V

AA

TC2 CLEAN HIGH SPD

Printing at high speed

51 - 255

114

–50V - –1500V

–500V

AB

TC2 CLEAN CLEANING

Cleaning

51 - 255

156

–50V - –1500V

–800V

AC

PTC LOW SPEED CL

PTC current 
reference value

Color

Lower speed

0 - 255

119

0/–100

µA - –700µA

–300

µA

AD

PTC MIDDLE SPEED CL

Middle speed

0 - 255

119

0/–100

µA - –700µA

–300

µA

AE

PTC LOW SPEED BK

Black and white

Lower speed

0 - 255

119

0/–100

µA - –700µA

–300

µA

AF

PTC MIDDLE SPEED BK

Middle speed

0 - 255

119

0/–100

µA - –700µA

–300

µA

AG

PTC HIGH SPEED BK

High speed

0 - 255

119

0/–100

µA - –700µA

–300

µA

AH

VCASE LOW SPEED CL

PTC case 
voltage 
reference value

Color

Lower speed

0 - 255

0

0/–200V - –1000V

0

AI

VCASE MIDDLE SPEED CL

Middle speed

0 - 255

0

0/–200V - –1000V

0

AJ

VCASE LOW SPEED BK

Black and white

Lower speed

0 - 255

0

0/–200V - –1000V

0

AK

VCASE MIDDLE SPEED BK

Middle speed

0 - 255

0

0/–200V - –1000V

0

AL

VCASE HIGH SPEED BK

High speed

0 - 255

0

0/–200V - –1000V

0

MX-7000N  ADJUSTMENTS  6 – 10

 

1)

Open the front cover (lower).

2)

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 completion of
the work. (Power OFF-ON) This procedure initializes the trans-
fer roller to return it to the home position.

3)

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

4)

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

5)

Remove the developing unit (BK) and the OPC drum unit (BK). 

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)

Close the front cover (lower).

10) 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.

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.

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

or when the color sensor

adjustment is completed

SIMULATION NO.44-13

TEST

PATCH SEAL ADJUSTMENT

EXECUTE

PCS CL CARB OUT

108

:

PCS CL DARK

0

:

PCS CL LED ADJ

21

:

1/1

CLOSE

SIMULATION NO.44-13

TEST

PATCH SEAL ADJUSTMENT

EXECUTE

PCS CL CARB OUT

108

:

PCS CL DARK

0

:

PCS CL LED ADJ

21

:

1/1

CLOSE

EXECUTE

EXECUTE

OK

MX-7000N  ADJUSTMENTS  6 – 11

 

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

PROCON GAIN ADJUSTMENT

EXECUTE

PCS_CL LED ADJ

21

:

PCS_K LED ADJ

21

:

1/2

SIMULATION NO.44-02

TEST

CLOSE

PCS_K BELT DIF

0

:

PCS_CL DARK

0

:

PCS_K DARK

0

:

PCS_K GRND

0

:

PCS_K BELT MAX

0

:

PCS_K BELT MIN

0

:

REG_F LED ADJ

27

:

REG_R LED ADJ

27

:

REG_F DARK

0

:

REG_R DARK

0

:

REG_F GRND

0

:

REG_R GRND

0

:

REG_F BELT MAX

0

:

REG_F BELT MIN

0

:

REG_F BELT DIF

0

:

REG_R BELT MAX

0

:

REG_R BELT MIN

0

:

REG_R BELT DIF

0

:

PROCON

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 E, Item F)

0 – 255

0

REGIST

I

REG_F LED ADJ

Image registration sensor light emitting quantity adjustment value F

1 – 255

27

J

REG_R LED ADJ

Image registration sensor light emitting quantity adjustment value R

1 – 255

27

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-7000N  ADJUSTMENTS  6 – 12

 

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 cover (lower).

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.

A : 1

;

MULTICOUNT

B : 4

;

PAPER : CS3

A:

SIMULATION NO.61-04

LSU POSITION ADJUSTMENT (SELF PRINT)

XXX

1

999

OK

TEST

CLOSE

EXECUTE

EXECUTE

EXECUTE

A : 2

;

MULTICOUNT

B : 4

;

PAPER : CS3

A:

SIMULATION NO.61-04

LSU POSITION ADJUSTMENT (SELF PRINT)

XXX

1

999

OK

TEST

CLOSE

EXECUTE

or end of print

10-key

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