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MX-7000N  ADJUSTMENTS  6 – 4

3)

Insert a thickness gauge of 0.45mm between 40mm – 70mm
from the edge of the developing doctor.

4)

Push the developing doctor in the arrow direction, and tighten
the fixing screw of the developing doctor. (Perform the similar
procedure for the front frame and the rear frame.)

5)

Check that the doctor gaps at two positions in 40mm – 70mm
from the both sides of the developing doctor are in the range of
0.45 

± 0.05mm.

* When inserting a thickness gauge, be careful not to scratch the

developing doctor and the developing roller.

 

This adjustment must be executed in the following cases:
* When the developing unit is disassembled.
* When the print image density is low.
* When there is a blur on the print image.

* When there is unevenness in the print image density.
* There is abnormally much toner dispersion.
1)

Remove the developing doctor cover, and place the develop-
ing unit on a flat surface.

2)

Attach a thread to a needle or a pin.

3)

Hold the thread and bring the needle near the developing
roller. (Do not use a paper clip because it will not provide a cor-
rect position.)

4)

Mark the developing roller surface on the extension line of the
needle with the needle at 2 – 3mm from the developing roller
surface. (Never touch the needle tip with the developing roller.)

5)

Measure the distance between the marking position and posi-
tion A of the developing unit frame, and check that it is 62.1 

±

0.5mm.
If the distance is not within the above range, adjust the devel-
oping roller main pole position in the following procedures.

6)

Remove the developing unit front cover, loosen the fixing
screw of the developing roller main pole adjustment plate, and
move the adjustment plate in the arrow direction to adjust.

Repeat procedures 3) – 6) until the developing roller main pole
position comes to the specified range.

7)

After completion of the adjustment of the developing roller
main pole position, fix the developing roller main pole adjust-
ment plate with the fixing screw.

40mm

70mm

70mm

40mm

40mm

70mm

70mm

40mm

2

㨪3mm

62.1 0.5mm

+

62.1 0.5mm

+

MX-7000N  ADJUSTMENTS  6 – 5

 

This adjustment must be executed in the following cases:
* When developer is replaced.

NOTE: Be sure to execute this adjustment only when developer is

replaced. Never execute it in the other cases.

1)

With the front cover (lower) open, enter SIM25-2.

2)

Close the front cover (lower).

3)

Select a developing unit to be adjusted.

4)

When [EXECUTE] key it pressed, it is highlighted. The devel-
oping roller rotates, and the toner sensor detects toner density,
and the output value is displayed.
The above operation is executed for 3 minutes, and the aver-
age value of the toner density sensor detection level is set
(saved) as the reference toner density control value.
When the reference toner density control adjustment operation
is completed, [EXECUTE] key display return, to normal from
highlight. This makes you know whether the adjustment opera-
tion is completed or not.
The above operation is executed each of the lower speed
mode, the middle speed mode and the high speed mode, and
the reference toner density control value is set for each of
them.
NOTE: If the operation is interrupted within 3 minutes, the 

adjustment result is not reflected (enabled).

When [EXECUTE] key is pressed during rotation, the opera-
tion is stopped and [EXECUTE] key returns to the normal dis-
play.
If [EE-EU], [EE-EL], or [EE-EG] is displayed, setting of the ref-
erence toner density control value is not completed normally.

5)

Use SIM24-5 to clear the developer counter.

6)

Use SIM44-27 to clear the half-tone correction data.

NOTE:
1)

When replacing developer, always replace all the three colors
of Yellow, Magenta, and Cyan.
If only one color is replaced, color balance may be adversely
affected. Black developer can be replaced individually.

2)

After replacement of developer or the photoconductor, be sure
to execute SIM44-27 to clear the half-tone correction data.
If the above procedure is neglected, the half-tone correction
may not be performed correctly.

 

 

This adjustment must be executed in the following cases:
* When the MC/DV high voltage power PWB is replaced. 
* When U2 trouble occurs. 
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.

EXECUTE

M

K

Adjustment completed

EXECUTE

Abnormal end

Y

C

AUTOMATIC DEVELOPER ADJUSTMENT

EXECUTE

TCD_K

45

:

1/1

SIMULATION NO.25-02

TEST

CLOSE

TCV_K

45

:

TCD_C

50

:

TCD_M

50

:

TCD_Y

45

:

TCV_C

50

:

TCV_M

50

:

TCV_Y

50

:

M

K

M

Y

C

K

AUTOMATIC DEVELOPER ADJUSTMENT

EXECUTE

AT DEVE ADJ_L_K

128

:

AT DEVEVO_L_Y

128

:

1/1

SIMULATION NO.25-02

TEST

CLOSE

AT DEVE ADJ_M_K

128

:

AT DEVE VO_M_Y

128

:

AT DEVE ADJ_L_C

128

:

AT DEVE VO_M_K

128

:

AT DEVE ADJ_L_M

128

:

AT DEVE VO_M_C

128

:

AT DEVE ADJ_L_Y

128

:

AT DEVE VO_M_M

128

:

AT DEVE ADJ_M_C

128

:

AT DEVE VO_H_K

128

:

AT DEVE ADJ_M_M

128

:

AT DEVE ADJ_M_Y

128

:

AT DEVE ADJ_H_K

128

:

AT DEVEVO_L_K

128

:

AT DEVEVO_L_M

128

:

AT DEVEVO_L_C

128

:

or process interrupt

Y

C

AUTOMATIC DEVELOPER ADJUSTMENT

EXECUTE

TCD_K

EE-EL

:

1/1

SIMULATION NO.25-02

TEST

CLOSE

TCV_K

:

TCD_C

50

:

TCD_M

EE-EL

:

TCD_Y

45

:

TCV_C

:

TCV_M

:

TCV_Y

:

M

K

M

Y

C

K

AUTOMATIC DEVELOPER ADJUSTMENT

EXECUTE

AT DEVE ADJ_L_K

185

:

AT DEVEVO_L_Y

128

:

1/1

SIMULATION NO.25-02

TEST

CLOSE

AT DEVE ADJ_M_K

185

:

AT DEVE VO_M_Y

128

:

AT DEVE ADJ_L_C

128

:

AT DEVE VO_M_K

185

:

AT DEVE ADJ_L_M

185

:

AT DEVE VO_M_C

128

:

:

AT DEVE ADJ_L_Y

128

:

AT DEVE VO_M_M

185

AT DEVE ADJ_M_C

128

:

AT DEVE VO_H_K

128

:

AT DEVE ADJ_M_M

185

:

AT DEVE ADJ_M_Y

128

:

AT DEVE ADJ_H_K

185

:

AT DEVEVO_L_K

185

:

AT DEVEVO_L_M

185

:

AT DEVEVO_L_C

128

:

EE-EL

EL 
abnormality

(1) The sensor output level is less 
than 0.5V in 1min after execution 
of SIM25-02.

When either 
of (1) or (2) 
is satisfied.

(2) The sensor output level is less 
than 1.5V after the adjustment for 
each speed or the control voltage 
exceeds 8.0V.

EE-EU

EU 
abnormality

(1) The sensor output level 
exceeds 4.5V in 1min after 
execution of SIM25-02.

When either 
of (1) or (2) 
is satisfied.

The sensor output level exceeds 
3.45V after the adjustment for 
each speed or the control voltage 
is less than 2.0V.

EE-EC

EC 
abnormality

The sensor output level after the 
adjustment for each speed is not 
2.5V 

± 0.2V. 

MX-7000N  ADJUSTMENTS  6 – 6

1)

Enter SIM8-2 mode.

2)

Select an output mode to be adjusted with the mode key and the scroll key. 

3)

Enter the adjustment value (specified value) of the middle speed mode and press [OK] key.

The adjustment value of each color mode is specified on the label
attached to the MC/DV high voltage power PWB. Enter that value.

GBK:XXX GBC:XXX GBM:XXX GBY:XXX

When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.
To adjust all the modes individually, first adjust the middle speed
mode, and then adjust the other mode.
If the middle speed mode is adjusted after adjustment of all the
modes individually, the adjustment values of the other modes are
automatically changed. Use care for that.
Therefore, unless there may be an abnormality in the output volt-
age, there is no need to check the output value.
If it must be checked that the normal voltage is outputted or if an
adjustment is required by referring to the output voltage, follow the
procedures below.

or after 30 sec.

10-key

A : 583

;

MIDDLE SPEED GB_K

B : 635

;

MIDDLE SPEED GB_C

C : 635

;

MIDDLE SPEED GB_M

D : 635

;

MIDDLE SPEED GB_Y

A:

SIMULATION NO.08-02

DV SETTING AND OUTPUT

XXX

230

850

OK

TEST

EXECUTE

EXECUTE

CLOSE

LOW/HIGH

MIDDLE

A : 500

;

MIDDLE SPEED GB_K

B : 635

;

MIDDLE SPEED GB_C

C : 635

;

MIDDLE SPEED GB_M

D : 635

;

MIDDLE SPEED GB_Y

A:

SIMULATION NO.08-02

DV SETTING AND OUTPUT

XXX

230

850

OK

TEST

EXECUTE

EXECUTE

CLOSE

LOW/HIGH

MIDDLE

MIDDLE

A

MIDDLE SPEED 
GB_K

K

Main charger grid voltage 
(Middle speed mode)

230 – 850

583

54.1 

± 1.62V

CNMON

8

–620V

B

MIDDLE SPEED 
GB_C

C Main charger grid voltage 

(Middle speed mode)

230 – 850

635

55.5 

± 1.67V

CNMON

6

–635V

C MIDDLE SPEED 

GB_M

M Main charger grid voltage 

(Middle speed mode)

230 – 850

635

55.5 

± 1.67V

CNMON

4

–635V

D MIDDLE SPEED 

GB_Y

Y

Main charger grid voltage 
(Middle speed mode)

230 – 850

635

55.5 

± 1.67V

CNMON

2

–635V

LOW/
HIGH

A

LOW SPEED 
GB_K

K

Main charger grid voltage 
(Low speed mode)

230 – 850

552

50.9 

± 1.53V

CNMON

8

–585V

B

LOW SPEED 
GB_C

C Main charger grid voltage 

(Low speed mode)

230 – 850

600

52.3 

± 1.57V

CNMON

6

–600V

C LOW SPEED 

GB_M

M Main charger grid voltage 

(Low speed mode)

230 – 850

600

52.3 

± 1.57V

CNMON

4

–600V

D LOW SPEED 

GB_Y

Y

Main charger grid voltage 
(Low speed mode)

230 – 850

600

52.3 

± 1.57V

CNMON

2

–600V

E

HIGH SPEED 
GB_K

K

Main charger grid voltage 
(High speed mode)

230 – 850

604 (70-sheets machine)

598 (62/55-sheets 

machine)

60.5 

± 1.82V

CNMON

8

–690V

MX-7000N  ADJUSTMENTS  6 – 7

1)

Remove the screw, and remove the main unit rear cover.

2)

Open the PWB holder.

3)

Enter SIM8-2 mode.

4)

Select an output mode to be adjusted with the mode key and
the scroll key.

5)

Check the relationship between the pin No. of the connector
CNMON on the MC/DV high voltage PWB and each adjust-
ment mode.

6)

Apply a digital multi-meter to the connector CNMON pin on the
MC/DV high voltage PWB corresponding to the adjusted
mode.

7)

Press [EXECUTE] key.
The main charger grid voltage is outputted for 30sec.
If this procedure is executed for a long time, the OPC drum
and the developing roller may be adversely affected. Use this
procedure as short as possible.
If possible, it is recommendable to use an unnecessary devel-
oping unit and an unnecessary OPC drum for this adjustment.

8)

Check the monitor voltage with the digital multi-meter.
If the monitor voltage is not in the range of the specified values
shown in the table above, change the adjustment value and
adjust again. If the specified value voltage is not obtained even
though the adjustment value is changed, the following parts
may be defective.
MC/DV high voltage PWB
PCU PWB
Developing unit
OPC drum unit
High voltage circuit electrode

 

This adjustment must be executed in the following cases:
* When MC/DV high voltage power PWB is replaced.
* When U2 trouble occurs.
* When PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
1)

Enter SIM8-1 mode.

2)

Select an output mode to be adjusted with the mode key and
the scroll key.

3)

Enter the adjustment value (specified value) of the middle
speed mode and press [OK] key.

or after 30 sec.

10-key

A : 450

;

MIDDLE SPEED DVB_K

B : 450

;

MIDDLE SPEED DVB_C

C : 450

;

MIDDLE SPEED DVB_M

D : 450

;

MIDDLE SPEED DVB_Y

A:

SIMULATION NO.08-01

DV SETTING AND OUTPUT

XXX

0

700

OK

TEST

EXECUTE

EXECUTE

CLOSE

LOW/HIGH

MIDDLE

A : 500

;

MIDDLE SPEED DVB_K

B : 450

;

MIDDLE SPEED DVB_C

C : 450

;

MIDDLE SPEED DVB_M

D : 450

;

MIDDLE SPEED DVB_Y

A:

SIMULATION NO.08-01

DV SETTING AND OUTPUT

XXX

0

700

OK

TEST

EXECUTE

EXECUTE

CLOSE

LOW/HIGH

MIDDLE

MIDDLE

A

MIDDLE SPEED DVB_K

K

Developing bias voltage (Middle 
speed mode)

0 – 700

450

12.0 

± 0.36V

CNMON

7

–450V

B

MIDDLE SPEED DVB_C

C

Developing bias voltage (Middle 
speed mode)

0 – 700

450

12.0 

± 0.36V

CNMON

5

–450V

C

MIDDLE SPEED DVB_M

M

Developing bias voltage (Middle 
speed mode)

0 – 700

450

12.0 

± 0.36V

CNMON

3

–450V

D

MIDDLE SPEED DVB_Y

Y

Developing bias voltage (Middle 
speed mode)

0 – 700

450

12.0 

± 0.36V

CNMON

1

–450V

LOW/
HIGH

A

LOW SPEED DVB_K

K

Developing bias voltage (Low 
speed mode)

0 – 700

420

11.1 

± 0.33V

CNMON

7

–420V

B

LOW SPEED DVB_C

C

Developing bias voltage (Low 
speed mode)

0 – 700

420

11.1 

± 0.33V

CNMON

5

–420V

C

LOW SPEED DVB_M

M

Developing bias voltage (Low 
speed mode)

0 – 700

420

11.1 

± 0.33V

CNMON

3

–420V

D

LOW SPEED DVB_Y

Y

Developing bias voltage (Low 
speed mode)

0 – 700

420

11.1 

± 0.33V

CNMON

1

–420V

E

HIGH SPEED DVB_K

K

Developing bias voltage (High 
speed mode)

0 – 700

450

12.0 

± 0.36V

CNMON

7

–450V