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MX-3100N  EXTERNAL VIEW AND INTERNAL STRUCTURE  5 – 20

48

Transport roller 13 (Drive)

Transports paper from the transport roller 9 to the 
transport roller 1. / Transport paper to the duplex (ADU) 
section.

49

Transport roller 13 (Idle)

Applies a pressure to paper and the transport roller to  
give the transport power of the transport roller to the 
paper.

50

Paper exit roller 1 (Idle)

Applies a pressure to paper and the paper exit roller to  
give the transport power of the paper exit roller to the 
paper.

51

Paper exit roller 1 (Drive)

Discharges paper. Transports paper to the right paper exit 
tray. Transport paper to the duplex (ADU) section.

52

Paper exit roller 2 (Idle)

Applies a pressure to paper and the paper exit roller to  
give the transport power of the paper exit roller to the 
paper.

53

Paper exit roller 2 (Drive)

Discharges paper.

54

Fusing roller (Heating)

Heat and press toner onto paper to fuse images.

55

Fusing roller (Pressing)

Applies a pressure to the fusing roller (heating).

56

Transport roller 14 (Drive)

Transports paper from the paper feed tray 2 to the 
transport roller 4.

57

Transport roller 14 (Idle)

Applies a pressure to paper and the transport roller to 
give the transport power of the transport roller to the 
paper.

MX-3100N  ADJUSTMENTS  6 – 1

MX-3100N

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

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)

ADJ 13

RSPF parallelism adjustment (RSPF mode)

13A

RSPF height adjustment (RSPF mode)

13B

RSPF diagonal adjustment (RSPF mode)

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 (Main/sub scanning direction) (RSPF mode)

48-1

ADJ 16

Scan image off-center adjustment

16A

Scan image off-center (Document table mode)

50-12

16B

Scan image off-center (RSPF 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

Adjust the original scan start position (Adjust the scanner read 
position in SPF-mode front face scan) (RSPF mode)

18C

Copy image position, image loss adjustment (RSPF mode)

50-6 (50-7)

ADJ 19

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

50-5

MX-3100N  ADJUSTMENTS  6 – 2

ADJ 20

Copy color balance/density adjustment

20A

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

63-3 (63-5)

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/gamma adjustment (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 monochrome 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

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

26-53

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

Automatic copy/printer color balance and density adjustment

46-74

ADJ 22

Adjusting the fusing paper guide position

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 tray paper size (width) sensor adjustment (RSPF mode)

53-7

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

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

MX-3100N  ADJUSTMENTS  6 – 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.