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MX-C300P  ADJUSTMENTS  5 – 15

 

This adjustment is used to set the offset value for the automatic
color registration adjustment (ADJ 5A).

If there is any difference in color phase at the center and the four
corners of an actual print image, this adjustment may improve it.
Especially when there is any color shift at the center area, this
adjustment may improve it effectively.

This adjustment cannot eliminate color shifts in all the areas, but
average the overall color shifts.

After the automatic adjustment, use this color registration offset
adjustment to correct color shift partially, performing the adjustment
efficiently.

Before execution of this adjustment, check to confirm that the fol-
lowing adjustment has been properly made.

* ADJ 5A or ADJ 5B image skew adjustment (LSU unit)

There are following two kinds of registration adjustment values.

- Base registration adjustment value: XXX(FRONT)/XXX(REAR)

They are manual adjustment values and automatic adjustment
values, and reflected when the automatic registration adjustment
is executed. It varies for every operation of the automatic regis-
tration adjustment.

- Offset adjustment values: OFFSETXXF/OFFSETXXR

They are the offset adjustment values added to the above base
registration adjustment values, and are not changed unless
SIM50-20 is executed to change.

1)

Enter SIM50-20 mode.

2)

Select the paper feed tray with A4(11"x8.5") paper in it.

3)

Press [OK] key.

The color image registration check pattern is printed.

4)

Check the color image registration.

There are 6 color image registration patterns in total; two on
each of the F side, the R side, and the center. Check all the
patterns to confirm that they are within the specified range.
Also check to confirm that there is not much shift in each color
image registration check pattern.

There are two kinds of adjustment: one in the main scanning
direction and the other in the sub scanning direction. The verti-
cal direction in the above figure is that in the main scanning
direction, and the horizontal direction is that in the sub scan-
ning direction.

       There are also two kinds of adjustments: the rough adjustment 
       and the fine adjustment. Perform the rough adjustment then 
       perform the fine adjustment.

For the main scan direction image registration, the offset on the F
side, the R side, and at the center is independently adjusted.

If there is a difference in the sub scanning direction image registra-
tion between the F and R sides, perform the skew adjustment (ADJ
5A).

Check the print patterns of the rough adjustment and the fine
adjustment of 18 check patterns.

Visually check the color image registration check section, use the
center position of the black scale as the reference, and check the
shift balance in the positive and negative directions at the color
image line position.

Use the center position of the black scale as the reference, and
check that the color image line is symmetrical in the positive side
and the negative side.

If shift is in the arrow mark X1 and Y1, increase the adjustment
value. If shift is in the arrow mark X2 and Y2, decrease the adjust-
ment value.

The reference arrow on the check pattern faces the positive direc-
tion.

1 scale/10 (When the set value is changed by 10, shift is made by 1
scale.)

Check to confirm that the darkest spot (one of 5 spots seen nor-
mally) is within the center area of the image registration adjustment
reference frame in the square frame.

At that time, use the color image registration check scale (fine
adjustment) as the reference.

Visually check and consider the darkest section of color density as
the center, and measure the shift from it.

Check to confirm that the center of the dark density section is within
+/- 1 step.

(If the fine adjustment print pattern is in the range of 0 +/- 1 for the
fine adjustment reference pattern scale, there is no need to adjust.)

If shift is in the arrow mark X1 and Y1, increase the adjustment
value. If shift is in the arrow mark X2 and Y2, decrease the adjust-
ment value.

1 scale/1 (When the set value is changed by 1, shift is made by 1
scale.)

A-sub

B-sub

B-main

A-main

X1

X2

Y2

Y1

Color image shift 
check section
(Rough adjustment)

A-main: Main scan rough adjustment pattern
A-sub: Sub scan rough adjustment pattern
B-main: Main scan fine adjustment scale
B-sub: Sub scan fine adjustment scale
C: Main scan sub scan fine adjustment pattern

Color image shift check
scale (Fine adjustment)

C (Image shift fine adjustment 
reference frame)

MX-C300P  ADJUSTMENTS  5 – 16

If there is a considerable difference in color shift in the square and
at the center area, perform the adjustment.

Select an adjustment item (OFF SET X F / OFF SET X R / OFF
SET X S), and change the adjustment value to adjust.

OFF SET X F: F side main scanning direction registration offset set
value (The color shift on the F side and at the center area is
changed.)

OFF SET X D: R side main scanning direction registration offset set
value (The color shift on the R side and at the center area is
changed.)

OFF SET X S: Sub scanning direction registration offset set value
(Color is shifted to the sub scanning direction overall.)

When the adjustment value of OFF SET X F and OFF SET X R are
changed, the color at the center area will be affected. Consider this
when executing the adjustment.

To adjust evenly overall, adjust so that the color shifts on the F side,
the R aide and at the center are of the same level.

To adjust with the center area most focused, adjust so that the color
shift at the center becomes smaller than that on the F side and the
R side.

When the offset adjustment value is 0, if the color registration
adjustment (automatic adjustment) is performed, the color shift on
the F side and that on the R side are automatically adjusted to be
smaller than that on the center area.

 

The following adjustment items which affect the image quality must
be properly set.

SKEW_K

Print skew amount calculation result 
(Cyan)

 -999 - 999

SKEW_C

Print skew amount calculation result 
(Cyan)

 -999 - 999

SKEW_C(DIF)

Print skew amount calculation result 
(Cyan) (Difference from the previous 
adjustment value) 

 -1999 - 1999

SKEW_M

Print skew amount calculation result 
(Magenta)

 -999 - 999

SKEW_M(DIF)

Print skew amount calculation result 
(Magenta) (Difference from the 
previous adjustment value)

 -1999 - 1999

SKEW_Y

Print skew amount calculation result 
(Yellow)

 -999 - 999

SKEW_Y(DIF)

Print skew amount calculation result 
(Yellow) (Difference from the 
previous adjustment value)

 -1999 - 1999

REGIST_SUB_
C

Registration adjustment value sub 
scanning direction (Cyan drum -> 
Black drum)

10 - 1990

REGIST_SUB_
C(DIF)

Registration adjustment value sub 
scanning direction  (Difference from 
the previous adjustment value)  
(Cyan drum to Black drum)

 -1999 - 1999

REGISTMAIN_
C_F

Registration adjustment value main 
scanning direction (Cyan laser 
writing position F side)

10 - 1990

REGISTMAIN_
C_F(DIF)

Registration adjustment value main 
scanning direction (Difference from 
the previous adjustment value) 
(Cyan laser writing position F side)

 -1999 - 1999

REGISTMAIN_
C_R

Registration adjustment value main 
scanning direction (Cyan laser 
writing position R side)

10 - 1990

REGISTMAIN_
C_R(DIF)

Registration adjustment value main 
scanning direction (Difference from 
the previous adjustment value) 
(Cyan laser writing position R side)

 -1999 - 1999

REGIST_SUB_
M

Registration adjustment value sub 
scanning direction (Magenta drum ->  
Black drum)

10 - 1990

REGIST_SUB_
M(DIF)

Registration adjustment value sub 
scanning direction  (Difference from 
the previous adjustment value)  
(Magenta drum to  Black drum)

 -1999 - 1999

REGIST_MAIN_
M_F

Registration adjustment value main 
scanning direction (Magenta laser 
writing position F side)

10 - 1990

REGIST_MAIN_
M_F(DIF)

Registration adjustment value main 
scanning direction (Difference from 
the previous adjustment value) 
(Magenta laser writing position F 
side)

 -1999 - 1999

REGIST_MAIN_
M_R

Registration adjustment value main 
scanning direction (Magenta laser 
writing position R side)

10 - 1990

REGIST_MAIN_
M_R(DIF)

Registration adjustment value main 
scanning direction (Difference from 
the previous adjustment value) 
(Magenta laser writing position R 
side)

  -1999 - 1999

REGIST_SUB_
Y

Registration adjustment value sub 
scanning direction (Yellow drum -> 
Black drum)

10 - 1990

REGIST_SUB_
Y(DIF)

Registration adjustment value sub 
scanning direction  (Difference from 
the previous adjustment value) 
(Yellow drum ->  Black drum)

 -1999 - 1999

REGIST_MAIN_
Y_F

Registration adjustment value main 
scanning direction (Yellow laser 
writing position F side)

10 - 1990

REGIST_MAIN_
Y_F(DIF)

Registration adjustment value main 
scanning direction (Difference from 
the previous adjustment value) 
(Yellow laser writing position F side)

 -1999 - 1999

REGIST_MAIN_
Y_R

Registration adjustment value main 
scanning direction (Yellow laser 
writing position R side)

10 - 1990

REGIST_MAIN_
Y_R(DIF)

Registration adjustment value main 
scanning direction (Difference from 
the previous adjustment value) 
(Yellow laser writing position R side)

 -1999 - 1999

PHASE

OPC drum phase adjustment value 
(BK to CL)

0 - 359

PHASE before

OPC drum phase adjustment value 
(BK to CL)

0 - 359

ADJ 

2

Image density 
sensor 
(image 
registration 
sensor) 
adjustment

2A

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

MX-C300P  ADJUSTMENTS  5 – 17

In the following cases, this adjustment is required.

1)

When maintenance is executed

2)

When repair or maintenance (on consumable parts such as
developer, the OPC drum, and the transfer belt) is executed:

3)

When the machine is installed 

Before checking the printer color balance and the density, be sure
to execute the following procedures in advance.

* Execute the high density image correction (Process correction)

forcibly. (SIM 44-6)

* The halftone image correction is forcibly executed. (SIM 44-26)

* For the color balance check and adjustment, use the normal

white paper.

If the other kind of paper is used, the proper image quality (color
balance, density) may not be obtained.

* Since color appearance may differ depending on the light source,

the environment for check and adjustments must be maintained
constant.

1)

Use SIM67-23 to print the color balance check sheet, and
check to confirm that the density of each patch is at the same
level as that of the color chart (UKOG-0331FCZZ).

At the same time, check to confirm that the gray patch is at the
neutral level.

Execute SIM 64-5 to print the print test pattern.

The print density of the patch must be changed gradually from the
lighter level to the darker level. The density changing direction must
not be reversed. The density level of each color must be almost at
the same level.

At that time, set the SIM64-5 set values to the default values.
(SI67-23 can be used as the check)

This machine is provided with the following color balance adjust-
ment modes. Use either one of them to adjust.  
When the gray balance is not acceptable after the [a. Manual color
balance adjustment], perform [b. Simple color balance adjustment
(Gray balance adjustment)]. When the gray balance is acceptable,
[b. Simple color balance adjustment (Gray balance adjustment)] is
not needed to be done. 

This adjustment is executed with SIM67-22.

Use this simulation to print the Color Balance Test page, and com-
pare it with the reference density of each color on the color chart
(UKOG-0331FCZZ) to find the patch whose density is the closest
to the reference density. Then enter the number of that patch.

Execute the above procedures for each of the low density area, the
middle density area, and the high density area.

This adjustment is executed with SIM67-21.

Use this simulation to print the Easy Calibration Test page, and
enter the coordinate value of the patch whose gray balance is best. 
NOTE :  When SIM67-22 is done, the adjustment result of SIM 67-
              21 is cleared.   

 

1)

When this adjustment is done, the adjustment result of SIM 67-
21 is cleared. 

2)

Enter the SIM 67-22 mode.

3)

Press [OK] key.

ADJ 

5

OPC drum 
phase 
adjustment

5A

Print engine image distortion 
adjustment (Manual 
adjustment) / OPC drum 
phase adjustment (Automatic 
adjustment) / 
color registration adjustment  
(Automatic adjustment)

50-22

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

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MX-C300P  ADJUSTMENTS  5 – 18

(A4 or 11" x 8.5" paper is automatically selected and the color
balance adjustment pattern is printed.)

*1: "Pattern patch 4" indicates the current adjustment color

balance. This is varied at every adjustment.

4)

Find out the patch which is closest to the patch reference den-
sity of the color chart (UKOG-0331FCZZ) in the Low Density
area, the Mid Density area, and the High Density area among
the patches of printed color balance adjustment pattern. It is
necessary to find out 12 patches. 

The visual checking result varies between individuals.  There-
fore, when the actual printing result is not acceptable, perform
this adjustment again and change patches to the darker ones
or the lighter ones.

When the patch out of printed range needs to be selected,
select the highest or lowest patch once and perform the adjust-
ment. By this way, the highest or lowest patch becomes the
center of the patch pattern (No.4) and the printing ranged is
expanded. However, this adjustment should be finished in the
default printing range. Therefore, if the patch out of printed
range needs to be selected, check the printing engine part at
first. 

When the patches of Low and Mid or Mid and High whose den-
sity is close (Not close setting value) are selected, the grada-
tion quality could be lost.              
ex). Low = 7 and Mid = 1, Mid = 7 and High = 1 

5)

Enter the adjust number of the color balance adjustment pat-
tern patch which was found in procedure 3) as the adjustment
value.

Select the adjustment density area (LOW, MID, HIGH), and
select the adjustment target color (C, M, Y, K), and enter the
adjustment number as the adjustment value.

6)

Press [OK] key after all adjustment values are entered. 

7)

After completion of registration of the adjustment data, the test
pattern is printed out again. When "COMPLETE" is displayed,
press [STOP] key to cancel SIM67-22.

8)

Check the adjustment result by using printed test pattern.

9)

Enter the SIM 44-26 mode.

10) Press [OK] key and the machine checks whether the adjust-

ment is done correctly or not. If the result is OK, finish this
adjustment. If the result is error, proceed the next step. 

11)  When the SIM44-26 result is error, enter the SIM 67-31 mode.

12) Press [OK] key and printer calibration setting values are set to

the default values. 

13) Perform step 1) to 10) to adjust the machine again. By this

way, repeat this procedure to have OK result in SIM44-26.

LOW

 C, M, Y, K,

MID

 C, M, Y, K,

HIGH

 C, M, Y, K,

1

2

3

4

5

6

7

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