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MX-4070N  EXTERNAL VIEW AND INTERNAL STRUCTURE  4 – 24

F1

Fuse

20A 250V

AC PWB (For 100V series)

F1

Fuse

10A 250V

AC PWB (For 200V series)

F2

Fuse

10A 250V

AC PWB (For 200V series)

F101

Fuse

12A 250V

DC Power PWB

F102

Fuse

2A 250V

DC Power PWB

F301

Fuse

5A 250V

DC Power PWB

F401

Fuse

3.15A 250V

DC Power PWB

F601

Fuse

6.3A 250V

DC Power PWB

F602

Fuse

6.3A 250V

DC Power PWB

F603

Fuse

6.3A 250V

DC Power PWB

F604

Fuse

6.3A 250V

DC Power PWB

F605

Fuse

6.3A 250V

DC Power PWB

TS LM

Thermostat

Mechanical thermostat

Shuts down the heater lamp (HL_LM) circuit when the fusing section is overheated

TS UM

Thermostat

Mechanical thermostat

Shuts down the heater lamp (HL_UM) circuit when the fusing section is overheated (center section)

TS US

Thermostat

Mechanical thermostat

Shuts down the heater lamp (HL_US) circuit when the fusing section is overheated (edge section)

TS LM

TS UM

TS US

DC PWB

AC PWB

F2

F1

F101

F102

F301

F601

F401

F602

F603

F604

F605

MX-4070N  ADJUSTMENTS AND SETTINGS  5 – 1

MX-4070N

Service Manual

 

Each adjustment item in the adjustment item list is associated with
a specific Job number. Perform the adjustment procedures in the
sequence of Job numbers from the smallest to the greatest.
However, there is no need to perform all the adjustment items.
Perform only the necessary adjustments according to the need.

Unnecessary adjustments can be omitted. Even in this case how-
ever the sequence from the smallest to the greatest Job number
must be observed.
If the above precaution should be neglected, the adjustment would
not complete normally or trouble may occur.

ADJ 1

Developing unit adjustment

1-A

Toner density control reference value setting

25-2

ADJ 2

High voltage values adjustment

2-A

Main charger grid voltage adjustment

8-2

2-B

Developing bias voltage adjustment

8-1

2-C

Transfer current and voltage adjustment

8-6

ADJ 3

Image density sensor 
adjustment

3-A

Image density sensor adjustment

44-2

ADJ4

Print image position, image 
magnification ratio adjustment 
(Print engine) (Manual 
adjustment)

4-A

Print image magnification ratio adjustment (main scanning direction) (Print engine) (Manual 
adjustment)

50-10

4-B

Print image position (main scanning direction, sub scanning direction adjustment, (Print 
engine) (Manual adjustment)

50-10

ADJ5

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

5-A

Print engine image distortion adjustment (Manual adjustment), OPC drum phase adjustment 
(Automatic adjustment), Color registration adjustment (Automatic adjustment)

50-22

5-B

Print engine image skew (LSU skew) adjustment (Manual adjustment) (No need to adjust 
normally)

50-20 

(64-1)

5-C

Color registration offset adjustment (No need to adjust normally)

50-20

ADJ6

Scan image distortion 
adjustment (Document table 
mode)

6-A

Scanner (reading) unit parallelism adjustment (sub scanning direction distortion adjustment)

6-B

Scan image (main scanning direction) distortion adjustment

ADJ7

Scanner image skew 
adjustment (DSPF/RSPF 
mode)

7-A

RSPF scan image skew adjustment

7-B

DSPF parallelism adjustment

7-C

DSPF skew adjustment (front surface mode)

7-D

DSPF skew adjustment (back surface mode)

ADJ8

Scan image focus adjustment

8-A

Image focus adjustment (document table mode, DSPF/RSPF front surface mode)

48-1

8-B

Image focus adjustment (DSPF back surface mode)

ADJ9

Scan image magnification ratio 
adjustment (Manual 
adjustment)

9-A

Scan image magnification ratio adjustment (main scanning direction) (Manual adjustment)

48-1

9-B

Scan image magnification ratio adjustment (main scanning direction) (Manual adjustment) 
(Document table mode)

48-1

9-C

Scan image magnification ratio adjustment (main scanning direction) (Manual adjustment) 
(DSPF/RSPF mode)

48-1

9-D

Scan image magnification ratio adjustment (sub scanning direction) (Manual adjustment) 
(DSPF/RSPF mode)

48-1

ADJ10

Scan image off-center 
adjustment (Manual 
adjustment)

10-A

Scan image off-center adjustment (Manual adjustment) (Document table mode)

50-12

10-B

Scan image off-center adjustment (Manual adjustment) (DSPF/RSPF mode)

50-12/50-6

ADJ11

Copy image position, image 
loss adjustment (Manual 
adjustment)

11-A

Copy image position, image loss (Manual adjustment) (Document table mode)

50-1

11-B

Image scanning position adjustment (Manual adjustment) (DSPF/RSPF mode)

53-8

11-C

Copy image position, image loss (Manual adjustment) (DSPF/RSPF mode)

50-6

ADJ12

Print lead edge image position adjustment (printer mode)

50-5

ADJ13

FR density variation correction

13-A

FR density unevenness automatic correction

61-11

13-B

FR density unevenness visual inspection correction

61-12

ADJ14/

SET1

Color balance and density 
adjustment

Note before execution of the image quality adjustment
Copy image quality check
Printer image quality check

14-A

Scanner calibration

14-A

(1)

Scanner calibration (CCD calibration) (document table 
mode)

63-3

14-A

(2)

Shading adjustment (DSPF mode)

63-2

14-A

(3)

Scanner calibration (CCD calibration) (DSPF mode)

63-3

SET 

1

Color balance 
adjustment target setup

1A

Copy color balance adjustment target setup

63-7/8/11

1B

Printer color balance adjustment target setup

67-26/27/

28

14-B

Copy, printer color balance and density adjustment (Automatic adjustment) (Basic 
adjustment)

46-74

: ‘17/July

MX-4070N  ADJUSTMENTS AND SETTINGS  5 – 2

ADJ14/

SET1

Color balance and density 
adjustment

14-C

Copy image quality 
adjustment (Basic 
adjustment)

14-C

(1)

Copy color balance and density adjustment (Automatic 
adjustment)

46-24

14-C

(2)

Copy color balance and density adjustment (Manual 
adjustment)

46-21

14-D

Copy, Image send, FAX 
image quality adjustment 
(Individual adjustment)

14-D

(1)

Color copy density adjustment (for each color copy 
mode) (separately for the low density area and the high 
density area) (No need to adjust normally)

46-1

14-D

(2)

Monochrome copy density adjustment (for each 
monochrome copy mode) (separately for the low density 
area and the high density area) (No need to adjust 
normally)

46-2

14-D

(3)

Color copy color balance, gamma adjustment (for each 
color copy mode) (No need to adjust normally)

46-10

14-D

(4)

Monochrome copy density, gamma adjustment (for each 
monochrome copy mode) (No need to adjust normally)

46-16

14-D

(5)

Automatic monochrome (Copy/scan/FAX) mode 
document density scanning operation (exposure 
operation) conditions setting (No need to set normally)

46-19

14-D

(6)

Document low density image density reproduction 
adjustment in the automatic monochrome (copy/scan/
FAX) mode (No need to adjust normally) (Background 
density adjustment in the scanning section)

46-32

14-D

(7)

Copy, scan low density image density adjustment (for 
each mode) (No need to adjust normally)

46-63

14-D

(8)

Color copy, text, line image reproduction adjustment 
(edge gamma, density adjustment) (Text, Map mode) 
(No need to adjust normally)

46-27

14-D

(9)

Monochrome (Copy/scan/FAX) mode color document 
reproduction adjustment (No need to adjust normally)

46-37

14-D

(10)

Color copy mode dark area gradation (black component 
quantity) adjustment (No need to adjust normally)

46-38

14-D

(11)

Color (copy/scan) mode sharpness adjustment (No 
need to adjust normally)

46-60

14-D

(12)

Copy high density image density reproduction setting 
(Normally unnecessary to the setting change)

46-23

14-D

(13)

Copy color balance adjustment (single color copy mode) 
(No need to adjust normally)

46-25

14-D

(14)

DSPF/RSPF mode (copy/scan/FAX) density adjustment 
(No need to adjust normally)

46-9

14-D

(15)

Copy gamma, color balance adjustment for each dither 
(Automatic adjustment)

46-54

14-D

(16)

Dropout color adjustment (Normally not required)

46-55

14-D

(17)

Watermark adjustment (Normally not required)

46-66

14-E

Printer image quality 
adjustment (Basic 
adjustment)

14-E

(1)

Printer color balance adjustment (Automatic adjustment)

67-24

14-E

(2)

Printer color balance adjustment (Manual adjustment)

67-25

14-F

Printer image quality 
adjustment (Individual 
adjustment)

14-F

(1)

Printer density adjustment (low density section density 
adjustment) (No need to adjust normally)

67-36

14-F

(2)

Printer high density image density reproduction setting 
(supporting the high density section tone gap) (No need 
to adjust normally)

67-34

14-F

(3)

Printer gamma adjustment for each dither (Automatic 
adjustment) (No need to adjust normally)

67-54

ADJ15

Paper size sensor adjustment

15-A

Manual paper feed tray paper size (width) sensor adjustment

40-2

15-B

DSPF/RSPF paper feed tray document size (width) sensor adjustment

53-6

ADJ16

Document size detection 
adjustment

16-A

Sensitivity adjustment of the original size sensor

41-2

ADJ17

Touch panel coordinate setting

65-1

ADJ18

Fusing paper guide position adjustment

: ‘17/July

MX-4070N  ADJUSTMENTS AND SETTINGS  5 – 3

 

 

This adjustment must be performed in the following cases.
• When developer is replaced

Be sure to execute this adjustment only when developer is
replaced. Never execute it in the other cases.

Perform the toner density reference control level adjustment with
the toner cartridges removed.
If adjustment is performed with toner cartridge installed, the EE-EL
trouble code or an over toner condition may occur.
1) With the front cover opened, enter Sim25-2
2) Close the front cover
3) Select a developing unit to be adjusted
4) When [EXECUTE] key is pressed, it is highlighted. The DV

roller rotates and the toner density sensor detects toner den-
sity and the output value is displayed.
The above operation is executed for 1 minutes and the aver-
age value of the toner density sensor detection level is set
(saves) as the reference toner density control value.
When the reference toner density control adjustment operation
is completed [EXECUTE] key returns to normal from highlight.
This makes known about whether the adjustment operation is
completed or not.
The above operation is executed each of the lower speed
mode and the middle speed mode and the reference toner
density control value is set for each of them.

If the operation is interrupted within 1 minutes the adjustment
result is not reflected.
When [EXECUTE] key is pressed during the operation, the
operation is stopped and [EXECUTE] key returns to the normal
display.
If [EE-EU], [EE-EL] or [EE-EC] is displayed, setting of the ref-
erence toner density control value is not completed normally.
Troubleshoot the cause, remove the cause and perform setting
again.

5) Cancel Sim 25-2
6) Confirm that "Instal the toner cartridge " is displayed and instal

the toner cartridge by the following procedures

7)

Shake the toner cartridge horizontally several times

8)

Open the front cover and insert each toner cartridge

Be sure to install the color cartridge to their proper positions.
Avoid installation to a different color position.

Do not forcibly insert the toner cartridge.
Push it in until the cartridge is securely locked in place.

Developing units removed, be sure to remove the toner car-
tridges as well to prevent toner clogging.

9)

Close the front cover

10) Confirm that "Toner replacement in progress" is displayed and

wait until the display disappears (It takes 30 sec - 6 min)

This procedure is for checking the toner supply operation from
the toner cartridge to the DV unit. The operation time differs
depending on the toner quantity in the toner cartridge, uneven
distribution of toner and the internal state of the toner car-
tridge.

EE-EL

EL abnormality

Sensor output level less than 77 or 
control voltage over 207

EE-EU

EU abnormality

Sensor output level over 177 or 
control voltage less than 52

EE-EC

EC abnormality

Sensor output level other than 128 

 

10