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MX-C250 ADJUSTMENTS 5 – 18

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.

How to check the rough adjustment pattern and input of the
adjustment value:

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.

(Reference adjustment value)

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

How to check the fine adjustment pattern and input of the
adjustment value:

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.

(Reference adjustment value)

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

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.

(Adjustment conditions and method)

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.

A-sub

B-sub

B-main

A-main

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)

Display/Item

Content

Display

SKEW_K

Print skew amount calculation result
(Cyan)

-99.9 - 99.9

SKEW_C

Print skew amount calculation result
(Cyan)

-999 - 999

SKEW_C(DIF)