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DX-C401  ADJUSTMENTS  4 – 1

DX-C401

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

Adjusting high voltage values

1A

Adjust the main charger grid voltage

8-2

1B

Adjust the developing bias voltage

8-1

1C

Transfer voltage adjustment

8-6

ADJ 2

Image density sensor (image 
registration sensor) adjustment

2A

Color image density sensor (image registration sensor F) calibration

44-13/44-61

2B

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

44-2

ADJ 3

Image skew adjustment (LSU unit)

61-4

ADJ 4

OPC drum phase adjustment

4A

OPC drum phase adjustment (Auto adjustment)

50-22

ADJ 5

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

50-10

ADJ 6

Image off-center adjustment (Print engine section)

50-10

ADJ 7

Image registration adjustment 
(Print engine section)

7A

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

50-22

7B

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

50-20

7C

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

50-20

ADJ 8

Scan image magnification ratio 
adjustment (Document table 
mode)

8A

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

48-1

8B

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

48-1

ADJ 9

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

9A

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

48-1

9B

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

48-1

ADJ 10

Scan image off-center 
adjustment

10A

Scan image off-center adjustment (Document table mode)

50-12

10B

Scan image off-center adjustment (RSPF mode)

50-12

ADJ 11

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

50-10/50-1

ADJ 12

Copy image position, image loss 
adjustment

12A

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

50-1 (50-2)

12B

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

53-8

12C

Copy image position, image loss adjustment (RSPF mode)

50-6 (50-7)

ADJ 13

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

50-5

ADJ 14

Copy color balance/density 
adjustment

14A

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

63-3 (63-5)

14B

Copy color balance adjustment (Auto adjustment)

46-24

14C

Copy color balance adjustment (Manual adjustment)

46-21

14D

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

46-1

14E

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

46-2

14F

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

46-10

14G

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

46-16

14H

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

46-19

14I

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

46-32

14J

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

46-63

14K

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

 Map mode gamma, 

density adjustment

46-27

14L

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

46-37

14M

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

46-38

14N

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

46-60

14O

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

46-23

14P

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

46-25

14Q

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

46-9

14R

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

26-53

14S

Copy color balance adjustment (Automatic adjustment for each dither) 
(Normally unnecessary to adjust)

46-54

DX-C401  ADJUSTMENTS  4 – 2

 

 

This adjustment is needed in the following situations:
* When the MC high voltage power PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)

Enter the SIM 8-2 mode.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

2)

Select an output mode and an item to be adjusted.

3)

Enter the adjustment value (specified value) in the middle
speed mode, and press [OK] key. (For the 4.3 Inch LCD
model, press the OSA shortcut key.)
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.

Enter the adjustment value of each mode which is specified on
the label attached on the MC high voltage power PWB.

NOTE: Note that the adjustment value may differ depending on the

MC high voltage power PWB.
Since the adjustment value label is attached on the MC
high voltage PWB, the PWB must be removed in order to
check the adjustment value.
This is a troublesome procedure. Therefore, it is advisable
to put down the adjustment value in advance.

GBK:XXX GBC:XXX  GBM:XXX  GBY:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.

NOTE: Since the high voltage output cannot be checked with a

digital multi meter in this model, a judgment of the output
must be made by checking the print image quality.

ADJ 15

Printer color balance/density 
adjustment

15A

Printer color balance adjustment (Auto adjustment)

67-24

15B

Printer color balance adjustment (Manual adjustment)

67-25

15C

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

67-36

15D

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

67-34

15E

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

26-54

15F

Automatic copy/printer color balance and density adjustment (Automatic adjustment)

46-74

15G

Printer color balance adjustment (Automatic adjustment for each dither) 
(Normally unnecessary to adjust)

67-54

ADJ 16

Manual paper feed tray paper size (width) sensor adjustment

40-2

ADJ 17

Touch panel coordinate setting

65-1

ADJ 18

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

18A

Print image main scanning direction image magnification ratio automatic adjustment

50-28

18B

Image off-center automatic adjustment (Document table mode)

50-28

18C

Copy lead edge image reference position adjustment, image off-center, sub scanning 
direction image magnification ratio automatic adjustment (Document table mode)

50-28

18D

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

50-28

ADJ 19

Fusing paper guide position adjustment

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MIDDLE

A

MIDDLE 
SPEED GB_K

K charging/grid bias set 
value at middle speed

150 - 850

B

MIDDLE 
SPEED GB_C

C charging/grid bias set 
value at middle speed

150 - 850

C

MIDDLE 
SPEED GB_M

M charging/grid bias set 
value at middle speed

150 - 850

D

MIDDLE 
SPEED GB_Y

Y charging/grid bias set 
value at middle speed

150 - 850

LOW

A

LOW SPEED 
GB_K

K charging/grid bias set 
value at low speed

150 - 850

B

LOW SPEED 
GB_C

C charging/grid bias set 
value at low speed

150 - 850

C

LOW SPEED 
GB_M

M charging/grid bias set 
value at low speed

150 - 850

D

LOW SPEED 
GB_Y

Y charging/grid bias set 
value at low speed

150 - 850

DX-C401  ADJUSTMENTS  4 – 3

 

This adjustment is needed in the following situations:
* When the MC high voltage power PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)

Go through the modes specified in Simulation 8-1.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

2)

Select an output mode and an item to be adjusted.

3)

Enter the adjustment value (specified value) in the middle
speed mode, and press [OK] key. (For the 4.3 Inch LCD
model, press the OSA shortcut key.)
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
Enter the adjustment value of each mode which is specified on
the label attached on the MC high voltage power PWB.

NOTE: Note that the adjustment value may differ depending on the

MC high voltage power PWB.
Since the adjustment value label is attached on the MC
high voltage PWB, the PWB must be removed in order to
check the adjustment value.
This is a troublesome procedure. Therefore, it is advisable
to put down the adjustment value in advance.

DVK:XXX DVC:XXX  DVM:XXX  DVY:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.

NOTE: Since the high voltage output cannot be checked with a

digital multi meter in this model, a judgment of the output
must be made by checking the print image quality.

 

This adjustment is needed in the following situations:
* When the TC high voltage PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)

Go through the modes specified in Simulation 8-6.
(4.3 Inch LCD model)

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MIDDLE

A

MIDDLE SPEED 
DVB_K

K developing bias set 
value at middle speed

0-600

B

MIDDLE SPEED 
DVB_C

C developing bias set 
value at middle speed

0-600

C

MIDDLE SPEED 
DVB_M

M developing bias set 
value at middle speed

0-600

D

MIDDLE SPEED 
DVB_Y

Y developing bias set 
value at middle speed

0-600

LOW

A

LOW SPEED 
DVB_K

K developing bias set 
value at low speed

0-600

B

LOW SPEED 
DVB_C

C developing bias set 
value at low speed

0-600

C

LOW SPEED 
DVB_M

M developing bias set 
value at low speed

0-600

D

LOW SPEED 
DVB_Y

Y developing bias set 
value at low speed

0-600

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DX-C401  ADJUSTMENTS  4 – 4

(8.5 Inch LCD model)

2)

Select an item to be adjusted.
Enter the adjustment value (specified value), and press [OK]
key. (For the 4.3 Inch LCD model, press the OSA shortcut
key.)
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
By setting the default value (specified value), the specified out-
put is provided.

A

TC1 LOW SPEED CL K

Primary 
transfer bias 
adjustment 
value

Color mode

K

Low speed 

mode

51 - 255

95

2 - 30

A

8

A

B

TC1 MIDDLE SPEED CL K

Middle speed 

mode

51 - 255

131

2 - 30

A

13

A

C

TC1 LOW SPEED CL C

C

Low speed 

mode

51 - 255

95

2 - 30

A

8

A

D

TC1 MIDDLE SPEED CL C

Middle speed 

mode

51 - 255

131

2 - 30

A

13

A

E

TC1 LOW SPEED CL M

M

Low speed 

mode

51 - 255

95

2 - 30

A

8

A

F

TC1 MIDDLE SPEED CL M

Middle speed 

mode

51 - 255

131

2 - 30

A

13

A

G

TC1 LOW SPEED CL Y

Y

Low speed 

mode

51 - 255

95

2 - 30

A

8

A

H

TC1 MIDDLE SPEED CL Y

Middle speed 

mode

51 - 255

131

2 - 30

A

13

A

I

TC1 LOW SPEED BW K

Black/White 

mode

K

Low speed 

mode

51 - 255

95

2 - 30

A

8

A

J

TC1 MIDDLE SPEED BW 
K

Middle speed 

mode

51 - 255

131

2 - 30

A

13

A

K

TC2 PLAIN CL SPX

Secondary 
transfer bias 
adjustment 
value

Color mode

Standard paper 

mode

Front surface 

mode

51 - 255

111

–2 - –80

A

–25

A

L

TC2 PLAIN CL DPX

Back surface 

mode

51 - 255

124

–2 - –80

A

–30

A

M

TC2 PLAIN BW SPX

Black/White 

mode

Front surface 

mode

51 - 255

111

–2 - –80

A

–25

A

N

TC2 PLAIN BW DPX

Back surface 

mode

51 - 255

111

–2 - –80

A

–25

A

O

TC2 HEAVY CL SPX

Color mode

Heavy paper 

mode

Front surface 

mode

51 - 255

93

–2 - –80

A

–10

A

P

TC2 HEAVY CL DPX 

Back surface 

mode

51 - 255

93

–2 - –80

A

–10

A

Q

TC2 HEAVY BW SPX

Black/White 

mode

Front surface 

mode

51 - 255

93

–2 - –80

A

–10

A

R

TC2 HEAVY BW DPX

Back surface 

mode

51 - 255

93

–2 - –80

A

–10

A

S

TC2 OHP CL

OHP

Color mode

51 - 255

85

–2 - –80

A

–8

A

T

TC2 OHP BW 

Black/White mode

51 - 255

85

–2 - –80

A

–8

A

U

TC2 ENVELOPE CL

Envelope

Color mode

51 - 255

124

–2 - –80

A

–30

A

V

TC2 ENVELOPE BW

Black/White mode

51 - 255

124

–2 - –80

A

–30

A

W

TC2 THIN CL

Thin paper

Color mode

51 - 255

111

–2 - –80

A

–25

A

X

TC2 THIN BW

Black/White mode

51 - 255

111

–2 - –80

A

–25

A

Y

TC2 GLOSSY CL

Gloss paper

Color mode

51 - 255

72

–2 - –80

A

–10

A

Z

TC2 GLOSSY BW

Black/White mode

51 - 255

72

–2 - –80

A

–10

A

AA

TC2 CLEANING

Cleaning mode

51 - 255

67

–2 - -80

A

–8

A

AB

TC2 CLEAN LOW SPD

Secondary 
transfer 
cleaning bias 
adjustment 
value

Low speed print mode

0 - 255

16

–100V - 1500V

0V

AC

TC2 CLEAN MIDDLE SPD

Middle speed print mode

0 - 255

16

–100V - 1500V

0V

AD

TC2 CLEAN CLEANING 

Cleaning mode

0 - 255

143

–100V - 1500V

800V

AE

PTC LOW SPEED CL

PTC current 
output 
adjustment 
value

Color mode

Low speed mode

0 - 255

133

0

A - –700A

–300

A

AF

PTC MIDDLE SPEED CL

Middle speed mode

0 - 255

133

0

A - –700A

–300

A

AG

PTC LOW SPEED BW

Black/White mode

Low speed mode

0 - 255

133

0

A - –700A

–300

A

AH

PTC MIDDLE SPEED BW

Middle speed mode

0 - 255

133

0

A - –700A

–300

A