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MX-2300/2700 N/G  EXTERNAL VIEW AND INTERNAL STRUCTURE  5 – 17

21

Transport roller 7 (Drive)

Transports paper from the paper feed tray 1, 2, 3, and 4 to the 
transport roller 8. 

22

Transport roller 8 (Idle)

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

23

Transport roller 8 (Drive)

Transports paper to the resist roller. 

24

Transport roller 9 (Idle)

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

25

Transport roller 9 (Drive)

Transports paper from the fusing roller to the transport roller 13. 

26

Transport roller 10 (Idle)

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

27

Transport roller 10 (Drive)

Transports paper from the transport roller 13 to the transport roller 11. 

28

Transport roller 11 (Idle)

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

29

Transport roller 11 (Drive)

Transports paper from the transport roller 10 to the transport roller 12. 

30

Transport roller 12 (Idle)

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

31

Transport roller 12 (Drive)

Transports paper from the transport roller 11 to the transport roller 8. / 
Transports the paper from the manual paper feed tray to the transport 
roller 8.

32

Transport roller 13 (Drive)

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

33

Transport roller 13 (Idle)

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

34

Paper exit roller 1 (Idle)

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

35

Paper exit roller 1 (Drive)

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

36

Paper exit roller 2 (Idle)

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

37

Paper exit roller 2 (Drive)

Discharges paper. 

38

Fusing roller (Heating)

Heats toner on paper, and fuses it onto paper. 

39

Fusing roller (Pressing)

Applies a pressure to the fusing roller (heating). 

MX-2300/2700 N/G  ADJUSTMENTS  6 – 1

MX2700N

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

Developing doctor gap adjustment

ADJ 2

Developing roller main pole position adjustment

ADJ 3

Toner density reference control level setting

ADJ 4

High voltage adjustments

ADJ 4A

Main charger grid voltage adjustment

8-2

ADJ 4B

Developing bias voltage adjustment

8-1

ADJ 4C

Transfer voltage adjustment

8-6

ADJ 5

Image density sensor, image registration sensor 
adjustment

ADJ 5A

Color image density sensor calibration

44-13

ADJ 5B

Color image density sensor, black image density sensor, image 
registration sensor adjustment

44-2

ADJ 6

Image skew adjustment (LSU unit)

64-1/61-4

ADJ 7

OPC drum phase adjustment

ADJ 7A

OPC drum phase adjustment (Auto adjustment)

50-22

ADJ 7B

OPC drum phase adjustment (Manual adjustment)

44-31

ADJ 8

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

ADJ 8A

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)

ADJ 10A

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

50-22

ADJ 10B

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

50-20

ADJ 10C

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

50-21

ADJ 11

Scan image distortion adjustment

ADJ 11A

Scanner (reading) unit parallelism adjustment

ADJ 11B

Scan image (sub scanning direction) distortion adjustment

ADJ 11C

Scan image (main scanning direction) distortion adjustment

ADJ 11D

Scan image distortion adjustment (Whole scanner)

ADJ 12

Scan image focus adjustment (CCD unit position adjustment)

ADJ 13

Scan image skew adjustment (RSPF) (Refer to MX-RPX1 SM.)

ADJ 14

Scan image magnification ratio adjustment 
(Document table mode)

ADJ 14A

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

48-1

ADJ 14B

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

48-1

ADJ 15

Scan image magnification ratio adjustment (RADF 
mode) (Refer to the MX-RPX1 SM.)

ADJ 15A

Scan image magnification ratio adjustment (Main scanning 
direction) (RADF mode) (Refer to the MX-RPX1 SM.)

48-1

ADJ 15B

Scan image magnification ratio adjustment (Sub scanning direction) 
(RADF mode) (Refer to the MX-RPX1 SM.)

48-1

ADJ 16

Scan image off-center adjustment

ADJ 16A

Scan image off-center (Document table mode)

50-12

ADJ 16B

Scan image off-center (RSPF mode) (Refer to the MX-RPX1 SM.)

50-12

ADJ 17

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

50-10/50-1

ADJ 18

Copy image position, image loss adjustment

ADJ 18A

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

50-1 (50-2)

ADJ 18B

Copy image position, image loss adjustment (RSPF mode) (Refer to 
the MX-RPX1 SM.)

50-6 (50-7)

ADJ 19

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

50-5

ADJ 20

Copy color balance/density adjustment

ADJ 20A

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

63-3 (63-5)

ADJ 20B

Copy color balance adjustment (Auto adjustment)

46-24

ADJ 20C

Copy color balance adjustment (Manual adjustment)

46-21

ADJ 20D

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

46-1

ADJ 20E

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

46-2

ADJ 20F

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

46-10

ADJ 20G

Monochrome copy density adjustment (Density adjustment at each 
density level in each monochrome copy mode) (Normally not 
required)

46-16

ADJ 20H

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

46-27

MX-2300/2700 N/G  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.

ADJ 20

Copy color balance/density adjustment

ADJ 20I

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

46-25

ADJ 20J

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

26-53

ADJ 20K

Background process condition setting in the color auto copy mode

46-33

ADJ 20L

Color document identification level (ACS operation) setting

46-33

ADJ 21

Printer color balance/density adjustment

ADJ 21A

Printer color balance adjustment (Auto adjustment)

67-24

ADJ 21B

Printer color balance adjustment (Manual adjustment)

67-25

ADJ 21C

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

26-54

ADJ 22

Fusing paper guide position adjustment

ADJ 23

Document size sensor adjustment

ADJ 23A

Document size sensor detection point adjustment

41-2

ADJ 23B

Document size sensor sensitivity adjustment

41-2

ADJ 24

Manual paper feed tray paper size (width) sensor adjustment

40-2

ADJ 25

RSPF tray paper size (width) sensor adjustment  (Refer to the MX-RPX1 SM.)

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

ADJ 27A

Print image main scanning direction image magnification ratio 
automatic adjustment

50-28

ADJ 27B

Image off-center automatic adjustment

50-28

ADJ 27C

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

50-28

ADJ 27D

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

50-28

: Jan. 15 2006

MX-2300/2700 N/G  ADJUSTMENTS  6 – 3

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
0.40 

± 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 developer is replaced.

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

replaced. Never execute it in the other cases.

㨪3mm

: Jan. 15 2006