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MX-7000N  ADJUSTMENTS  6 – 2

 

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 unit from the main unit, and remove
the developing unit upper cover and the developing doctor
cover.

2)

Loosen the developing doctor fixing screw.

3)

Insert a thickness gauge of 0.40mm 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.)

ADJ 22

Copy color balance/density adjustment

22I

Gamma/density adjustment in the text image edge section (Normally not required)

46-27

22J

Copy color balance adjustment (Single color copy mode) (Normally not required)

46-25

22K

Auto color balance adjustment by the user (Copy color balance auto adjustment 
ENABLE setting and adjustment)

26-53

22L

Background process condition setting in the color auto copy mode

46-33

22M

Color document identification level (ACS operation) setting

46-33

ADJ 23

Printer color balance/density 
adjustment

23A

Printer color balance adjustment (Auto adjustment)

67-24/44-26

23B

Printer color balance adjustment (Manual adjustment)

67-25/44-26/
67-27/67-28

23C

Auto color balance adjustment by the user (Printer color balance auto adjustment 
ENABLE setting and adjustment)

26-54

ADJ 24

Fusing paper guide position adjustment

ADJ 25

Document size sensor adjustment

25A

Document size sensor detection point adjustment

41-1

25B

Document size sensor sensitivity adjustment

41-2

ADJ 26

Manual paper feed tray paper size (width) sensor adjustment

40-2

ADJ 27

DSPF paper feed tray paper size (width) sensor adjustment

53-6

ADJ 28

Touch panel coordinate setting

65-1

ADJ 29

Image loss, void area, image off-
center, image magnification ratio auto 
adjustment with SIM50-28

29A

Print image main scanning direction image magnification ratio automatic adjustment

50-28

29B

Image off-center automatic adjustment

50-28

29C

Copy lead edge image reference position adjustment, image off-center, sub scanning 
direction image magnification ratio automatic adjustment

50-28

29D

DSPF mode auto void adjustment (Service installation adjustment)

50-28

ADJ 30

Shading adjustment

63-2

MX-7000N  ADJUSTMENTS  6 – 3

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
0.40 

± 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 37.8 

±

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.

 

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 unit from the main unit, and remove
the developing unit upper cover and the developing doctor
cover.

2)

Loosen the developing doctor fixing screw.

2㨪3mm

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.