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MX-4101N  ADJUSTMENTS  5 – 1

MX-4101N

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. Per-
form 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

Adjust the developing doctor gap

ADJ 2

Adjust the developing roller main pole

ADJ 3

Toner density control reference value setting

25-2

ADJ 4

Adjusting high voltage values

4A

Adjust the main charger grid voltage

8-2

4B

Adjust the developing bias voltage

8-1

4C

Transfer voltage adjustment

8-6

ADJ 5

Image density sensor (image registration 
sensor) adjustment

5A

Color image density sensor (image registration sensor F) calibration

44-13

5B

Color image density sensor (image registration sensor F), black image 
density sensor (image registration sensor R) adjustment

44-2

ADJ 6

Image skew adjustment (LSU unit)

61-4

ADJ 7

OPC drum phase adjustment

7A

OPC drum phase adjustment (Auto adjustment)

50-22

7B

OPC drum phase adjustment (Manual adjustment)

44-31

ADJ 8

Print engine image magnification ratio adjustment (BK) (Main scanning direction) (Print engine section) (Manual adjustment)

50-10

ADJ 9

Image off-center adjustment (Print engine section)

50-10

ADJ 10

Image registration adjustment (Print engine 
section)

10A

Image registration adjustment (Main scanning direction, sub scanning 
direction) (Auto adjustment)

50-22

10B

Image registration adjustment (Main scanning direction) (Manual 
adjustment)

50-20

10C

Image registration adjustment (Sub scanning direction) (Manual 
adjustment)

50-21

ADJ 11

Scan image distortion adjustment

11A

Scanner (reading) unit parallelism adjustment

11B

Scan image (sub scanning direction) distortion adjustment

11C

Scan image (main scanning direction) distortion adjustment

11D

Scan image distortion adjustment (Whole scanner unit)

ADJ 12

Scan image focus adjustment (CCD unit 
position adjustment)

12A

Document table mode image focus adjustment

12B

DSPF mode image focus adjustment

ADJ 13

RSPF/DSPF parallelism adjustment

13A

RSPF height adjustment

13B

RSPF diagonal adjustment

13C

DSPF levelness adjustment

13D

DSPF skew adjustment

ADJ 14

Scan image magnification ratio adjustment 
(Document table mode)

14A

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

48-1

14B

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

48-1

ADJ 15

Scan image magnification ratio adjustment 
(RSPF/DSPF mode)

15A

Scan image magnification ratio adjustment (Main scanning direction) 
(RSPF mode)

48-1

15B

Scan image magnification ratio adjustment (Sub scanning direction) 
(RSPF mode)

48-1

15C

Scan image magnification ratio adjustment (Main scanning direction) 
(DSPF mode)

48-1

15D

Scan image magnification ratio adjustment (Sub scanning direction) 
(DSPF mode)

48-1

ADJ 16

Scan image off-center adjustment

16A

Scan image off-center adjustment (Document table mode)

50-12

16B

Scan image off-center adjustment (RSPF mode)

50-12

16C

Scan image off-center adjustment (DSPF mode)

50-12

ADJ 17

Print area (Void area) adjustment (Print engine section)

50-10/50-1

ADJ 18

Copy image position, image loss adjustment

18A

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

50-1 (50-2)

18B

Document scan position adjustment (RSPF mode)

53-8

18C

Document scan position adjustment (DSPF mode)

53-8

18D

Copy image position, image loss adjustment (RSPF mode)

50-6 (50-7)

18E

Copy image position, image loss adjustment (DSPF mode)

50-6 (50-7)

ADJ 19

Print lead edge image position adjustment (Printer mode) (Print engine section)

50-5

MX-4101N  ADJUSTMENTS  5 – 2

ADJ 20

Copy color balance/density adjustment

20A 

(1)

CCD gamma adjustment (CCD calibration) (Normal document copy 
mode)

63-3 (63-5)

20A 

(2)

CCD gamma adjustment (CCD calibration) (DSPF mode)

63-3 (63-5)

20A 

(3)

Shading adjustment (DSPF mode)

20B

Copy color balance adjustment (Auto adjustment)

46-24

20C

Copy color balance adjustment (Manual adjustment)

46-21

20D

Copy density adjustment (Each color copy mode) (Whole adjustment) 
(Normally unnecessary to adjust)

46-1

20E

Copy density adjustment (Each monochrome copy mode) (Whole 
adjustment) (Normally unnecessary to adjust)

46-2

20F

Copy color balance adjustment (Color balance adjustment at each density 
level in each color copy mode) (Normally not required)

46-10

20G

Monochrome copy density/gamma adjustment (Each monochrome copy 
mode) (Normally not required)

46-16

20H

Condition setting of document density reading operation (exposure) in the 
monochrome auto copy mode (Normally not required)

46-19

20I

Document background density reproducibility adjustment in the 
monochrome auto copy mode (Normally unnecessary to adjust)

46-32

20J

Copy density adjustment for low density section (Each copy mode) 
(Normally unnecessary to adjust)

46-63

20K

Color copy text, line image edge gamma, density adjustment/Text

⋅Map 

mode gamma, density adjustment

46-27

20L

Color document reproducibility adjustment in the monochrome copy mode 
(Normally unnecessary to adjust)

46-37

20M

Black ingredient amount adjustment in color copy mode (Normally 
unnecessary to adjust)

46-38

20N

Sharpness adjustment in the color auto copy mode (Normally 
unnecessary to adjust)

46-60

20O

Copy high density part density correction setting (Prevents against tone 
gap) (Normally unnecessary to adjust)

46-23

20P

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

46-25

20Q

Copy density adjustment in the RSPF mode (Normally unnecessary to 
adjust)

46-9

20R

DSPF mode copy density adjustment (Normally not necessary to adjust)

20S

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

26-53

20T

Copy color balance adjustment (Automatic adjustment for each dither)

46-54

ADJ 21

Printer color balance/density adjustment

21A

Printer color balance adjustment (Auto adjustment)

67-24

21B

Printer color balance adjustment (Manual adjustment)

67-25

21C

Printer density adjustment (low density part density adjustment) (Normally 
unnecessary to adjust)

67-36

21D

Printer high density part desnsity correction setting (high density part tone 
gap countermeasure) (Normally unnecessary to the setting change)

67-34

21E

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

26-54

21F

Copy/Printer color balance and density adjustment (Automatic 
adjustment)

46-74

21G

Printer color balance adjustment (Automatic adjustment for each dither)

67-54

ADJ 22

Fusing paper guide position adjustment

ADJ 23

Document size sensor adjustment

23A

Document size sensor detection point adjustment

41-2

23B

Adjust the sensitivity of the original size sensor

41-2

ADJ 24

Manual paper feed tray paper size (width) sensor adjustment

40-2

ADJ 25

RSPF/DSPF tray paper size (width) sensor 
adjustment

25A

RSPF tray paper size (width) sensor adjustment

53-6

25B

DSPF tray paper size (width) sensor adjustment

53-6

ADJ 26

Touch panel coordinate setting

65-1

ADJ 27

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

27A

Print image main scanning direction image magnification ratio automatic 
adjustment

50-28

27B

Image off-center automatic adjustment

50-28

27C

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

50-28

27D

RSPF mode image off-center, image lead edge position, sub scanning 
direction image magnification ratio automatic adjustment

50-28

27E

DSPF mode image off-center, image lead edge position, sub scanning 
direction image magnification ratio auto adjustment

50-28

MX-4101N  ADJUSTMENTS  5 – 3

 

This adjustment is needed in the following situations:
* The developing unit has been 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.
* The toner is excessively dispersed.
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 0.60mm in 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
0.60 

± 0.05mm.

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

developing doctor and the developing roller.

Note for use of a thickness gauge
• Do not insert the gauge diagonally.
• The gauge must pass freely.
• The advisable point of measurement is the MIN point of the MG

roller oscillation.

* Marked point (A) on the follower side (right side) of the MG roller.

MX-4101N  ADJUSTMENTS  5 – 4

 

This adjustment is needed in the following situations:
* The developing unit has been 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.
* The toner is excessively dispersed.
1)

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

2)

Attach a piece of string to a sewing needle or pin.

3)

Hold the thread and bring the needle near the developing
roller. (Do not use a paper clip because too heavy. It will not
provide a correct 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 is needed in the following situations:
* 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 cabinet open, enter SIM25-2.

2)

Close the front cabinet.

3)

Select a developing unit to be adjusted.

㨪3mm

EXECUTE

M

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