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MX-M1204  ADJUSTMENTS  5 – 1

MX-M1204

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.
There is, however, no need to perform all the adjustments. Perform only the necessary adjustments.
Unnecessary adjustments can be omitted. 
If adjustments are omitted, the sequence of adjustments must be observed in ascending order.  Failure to follow this procedure may result in 
improper adjustment or failure of operation. 

ADJ1

High voltage values 
adjustment

ADJ 1A

Main charger grid voltage adjustment

8-2

ADJ 1B

Developing bias voltage adjustment

8-1

ADJ 1C

Transfer current adjustment

8-6

ADJ 1D

Photoconductor dark potential adjustment

44-3

ADJ2

Developing unit adjustment

ADJ 2A

Developing doctor gap adjustment

ADJ 2B

Developing roller main pole position adjustment

ADJ 2C

Toner density control reference value setting

25-2

ADJ3

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

ADJ 3A

Print image distortion manual adjustment (LSU parallelism adjustment)

64-2

ADJ 3B

Print image magnification ratio manual adjustment (Main scanning direction)

50-10

ADJ 3C

Print image lead edge void area manual adjustment/Front-rear void area, rear edge 
void area manual adjustment

50-5

ADJ4

Scan image distortion 
adjustment (OC mode)

ADJ 4A

Scanner (reading) unit parallelism adjustment

ADJ 4B

Scan image sub scanning direction distortion adjustment

ADJ 4C

Scan image main scanning direction distortion adjustment

ADJ5

Scan image distortion 
adjustment (DSPF mode)

ADJ 5A

DSPF level adjustment

ADJ 5B

DSPF skew adjustment (Front surface mode)

64-2

ADJ 5C

DSPF skew adjustment (Back surface mode)

ADJ6

Scan image focus adjustment

ADJ 6A

Image focus adjustment (Document table mode/ DSPF front surface mode)

ADJ 6B

Image focus adjustment (DSPF back surface mode)

ADJ7

Scan image magnification 
ratio adjustment

ADJ 7A

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

48-1, 48-5

ADJ 7B

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

48-1, 48-5

ADJ 7C

Main scanning direction image magnification ratio adjustment 
(DSPF front surface mode)

48-1, 48-5

ADJ 7D

Main scanning direction image magnification ratio adjustment 
(DSPF back surface mode)

48-1, 48-5

ADJ 7E

Sub scanning direction image magnification ratio adjustment (DSPF mode)

48-1, 48-5

ADJ8

Print/scan image off-center, 
lead edge position adjustment 
(Manual adjustment)

ADJ 8A

Print image off-center, lead edge position manual adjustment (Software adjustment) 
(90cpm machine)

50-10

ADJ 8B

Print image off-center, lead edge position manual adjustment (Software adjustment) 
(105/120cpm machine)

50-10

ADJ 8C

Paper feed off-center manual adjustment (Manual paper feed unit) (MX-MF11) 
(Mechanical adjustment)

50-10

ADJ 8D

Paper feed off-center manual adjustment (No.1 - 4 paper feed unit in main unit) 
(Mechanical adjustment)

50-10

ADJ 8E

Paper feed off-center manual adjustment (LCC) (Mechanical adjustment)

50-10

ADJ 8F

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

50-12

ADJ 8G

Scan image off-center manual adjustment (DSPF (Front surface) mode)

50-12

ADJ 8H

Scan image off-center manual adjustment (DSPF (Back surface) mode)

50-12

ADJ9

Print/scan image lead edge 
position, off-center, 
magnification ratio adjustment 
(Automatic adjustment)

ADJ 9A

Print image magnification ratio automatic adjustment (Main scanning direction) 
(Corresponding to ADJ3B)

50-28

ADJ 9B

Print image off-center automatic adjustment (Each paper feed tray, duplex mode) 
(Corresponding to ADJ3C/8A)
Print image lead edge position automatic adjustment (Each paper feed tray, duplex 
mode) (Corresponding to ADJ3C/8A) NOTE: For the 90cpm machine. For the 105/
120cpm machines, the adjustment is inhibited.

50-28

ADJ 9C

Scan image magnification ratio automatic adjustment (Sub scanning direction) 
(Document table mode) (Corresponding to ADJ7B)
Scan image off-center automatic adjustment (Document table mode) 
(Corresponding to ADJ8A)
Scan image lead edge reference position automatic adjustment 
(Document table mode) (Corresponding to SIM 50-1 RRCA)

50-28

ADJ 9D

Scan image magnification ratio automatic adjustment (Sub scanning direction ) 
(DSPF mode) (Corresponding to ADJ7E)
Scan image off-center automatic adjustment (DSPF mode) 
(Corresponding to ADJ8G/ADJ8H)
Scan image lead edge reference position automatic adjustment (DSPF mode) 
(Corresponding to ADJ9C)

50-28

MX-M1204  ADJUSTMENTS  5 – 2

ADJ10

Image position, image loss, 
and void area adjustment

ADJ10A

Copy mode image loss void area adjustment (Document table mode)

50-1

ADJ10B

Document scan position adjustment (Scanner scanning position adjustment when 
scanning the front surface in the DSPF mode)

53-8

ADJ10C

Copy mode image loss adjustment (DSPF mode)

50-6

ADJ10D

Image send mode, image loss adjustment

50-27

ADJ10E

FAX send mode image loss adjustment

50-27

ADJ11/

SET1

Gray balance/density 
adjustment

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

ADJ 11A

Scanner calibration (CCD calibration)

63-3 (63-5)

SET1

Gray balance 
adjustment target 
setup

1A

Copy gray balance adjustment target setup

63-7/8/11

1B

Printer gray balance adjustment target setup

67-26/27/28

ADJ 11B

Copy/Printer gray balance and density adjustment (Automatic adjustment) 
(Basic adjustment)

46-74

ADJ 11C

Copy quality 
adjustment 
(Basic adjustment)

11C 

(1)

Copy gray balance and density adjustment 
(Automatic adjustment)

46-24

11C 

(2)

Copy gray balance and density adjustment (Manual 
adjustment)

46-16

ADJ 11D

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

11D 

(1)

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

11D 

(2)

Copy gray balance, gamma adjustment 
(No need to adjust normally)

46-10

11D 

(3)

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

46-16

11D 

(4)

Automatic monochrome (Copy/Scan/FAX) mode 
document density scanning operation (exposure 
operation) conditions setting (Normally no need to 
set)

46-19

11D 

(5)

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

11D 

(6)

Copy/Scan low density image density adjustment (for 
each mode) (No need to adjust normally)

46-63

11D 

(7)

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

46-37

11D 

(8)

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

46-60

11D 

(9)

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

46-23

11D 
(10)

DSPF mode (Copy/Scan/FAX) density adjustment 
(No need to adjust normally)

46-9

11D 
(11)

Automatic gray balance adjustment by the user (Copy 
gray balance automatic adjustment ENABLE setting 
and adjustment)

26-53

11D 
(12)

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

46-54

11D 
(13)

Dropout color adjustment (Normally not required)

46-55

11D 
(14)

Watermark adjustment (Normally not required)

46-66

ADJ 11E

Printer image 
quality adjustment 
(Basic adjustment)

11E 

(1)

Printer gray balance adjustment 
(Automatic adjustment)

67-24

11E 

(2)

Printer gray balance adjustment 
(Manual adjustment)

67-25

ADJ 11F

Printer image 
quality adjustment 
(Individual 
adjustment)

11F 

(1)

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

67-36

11F 

(2)

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

67-34

11F 

(3)

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

67-54

11F 

(4)

Automatic gray balance adjustment by the user 
(Printer gray balance automatic adjustment ENABLE 
setting and adjustment) (Normally unnecessary to the 
setting change)

26-53

: ‘16/Aug.

MX-M1204  ADJUSTMENTS  5 – 3

 

(Note)
To check and adjust the output voltage, use the unit which can
measure an effective value of 1000M

 or more internal imped-

ance.  In addition, use a high voltage probe as well. 
(FLUKE87FLUKE80K-40 is recommended.) 

 

This adjustment is needed in the following situations:
* When the 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) Enter the Sim. 8-2 mode.
2) Select the output mode to be adjusted with the scroll button.

3) Enter the adjustment value with 10-key, and press [OK] button.

The adjustment value is set.

Remark:
Normally when the default value is set, the specified voltage is out-
putted.
The adjustment value of each color mode is specified on the label
attached to the high voltage PWB. Enter that value.

GBK:XXX

When [EXECUTE] key is pressed, the voltage entered in the proce-
dure 3) is outputted for 30 sec and the set value is saved.
When [EXECUTE] key is pressed again, the output is stopped.

CAUTION: Note that the adjustment value may differ depending on

the high voltage PWB.

CAUTION: The default values specified for each model must be

changed as follows:
90cpm machine: + 0
105/120cpm machine: + 30

When [EXECUTE] button is pressed, the adjustment value is saved
and the developing bias voltage is outputted simultaneously.
When the output voltage must be checked to be normal or not or
when an adjustment is required while checking the output voltage,
follow the procedures below:

ADJ12

Image send, FAX send mode, 
image quality adjustment

ADJ12A

Color image send mode, image density and gradation adjustment (by each mode)

46-4

ADJ12B

Monochrome image send mode, image density and gradation adjustment (by each 
mode)

46-5

ADJ12C

Image send mode, image color balance adjustment

46-8

ADJ12D

FAX send mode, image sharpness adjustment

46-39

ADJ13

FAX send mode image quality 
adjustment

ADJ13A

Image density and gradation adjustment in the FAX send mode 
(Collective adjustment of all the FAX modes)

46-40

ADJ13B

Image density and gradation adjustment in the FAX send mode (Normal mode)

46-41

ADJ13C

Image density and gradation adjustment in the FAX send mode (Fine mode)

46-42

ADJ13D

Image density and gradation adjustment in the FAX send mode 
(Super fine mode)

46-43

ADJ13E

Image density and gradation adjustment in the FAX send mode (Ultra fine mode)

46-44

ADJ13F

Image density and gradation adjustment in the IFAX send mode (600dpi mode)

46-45

ADJ14

Setting of the auto exposure mode operating conditions in copy, scan, and FAX

46-19

ADJ15

Paper size detection 
adjustment 

ADJ15A

Manual paper feed tray paper width sensor adjustment

40-2

ADJ15B

Paper feed tray 4 paper width sensor adjustment

40-12

ADJ15C

DSPF paper feed tray document width sensor adjustment

53-6

ADJ16

Document size detection adjustment (Document table mode)

41-2

ADJ17

Touch panel coordinate adjustment

65-1

ADJ18

Waste toner full detection adjustment

30-1

ADJ19

Fusing paper guide position adjustment (Manual adjustment of fusing paper guide position )

ADJ20

Decurler roller adjustment

ADJ21

DSPF CCD calibration

ADJ21A

DSPF shading adjustment

63-2

ADJ21B

CCD gamma adjustment (CCD calibration) (DSPF mode)

63-3

A

GB_K

Main charger grid voltage adjustment 
value

200-1000

575

605

CN3

7

-595 +/- 5 V

-625 +/- 5 V

: ‘14/Feb

: ‘16/Aug.

MX-M1204  ADJUSTMENTS  5 – 4

1) Remove the upper rear cover of the machine

2) Attach the digital multi-meter between the connector CN3 pin

(7) on the high voltage pwb and GND.

3)

Enter the adjustment value with 10-key, and press [EXECUTE]
key.
The main charger voltage is outputted for 10sec.

Note:
Perform this procedure timely as extended charge output will
stress the photoconductor.

4)

Check the output voltage with the digital multi-meter.
If the output voltage is outside the specified range described in
the above table, perform procedures 2 thru 4 until the specified
value is reached.

NOTE:
If the specified voltage is not obtained by changing the adjust-
ment value, one of the following parts may be defective.
-  High voltage PWB
-  PCU PWB
-  OPC drum unit
-  High voltage circuit electrode

 

This adjustment is needed in the following situations:
* The high voltage PWB has been replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1) Enter the Sim. 8-1 mode. .
2) Select the output mode to be adjusted with the scroll button.

3) Enter the adjustment value with 10-key, and press [OK] button.

The adjustment value is set.

Remark:
Normally when the default value is set, the specified voltage is out-
putted.
The adjustment value of each color mode is specified on the label
attached to the high voltage PWB. Enter that value.

DV-:XXX DV+:XXX
When [EXECUTE] key is pressed, the voltage entered in the proce-
dure 3) is outputted for 30 sec and the set value is saved.
When [EXECUTE] key is pressed again, the output is stopped.

CAUTION: Note that the adjustment value may differ depending on

the high voltage PWB.

When [EXECUTE] button is pressed, the adjustment value is saved
and the developing bias voltage is outputted simultaneously.
When the output voltage must be checked to be normal or not or
when an adjustment is required while checking the output voltage,
follow the procedures below:
1)

Remove the upper rear cover of the machine

&1

A

DVB_K

Developing bias adjustment value

0-750

496

CN3

11

-500 +/- 5 V

B

DVB_K_PLUS

Reverse developing bias voltage

0-250

164

CN3

11

+150 +/- 5 V

: ‘14/Feb

: ‘16/Aug.