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MX-C301  ADJUSTMENTS  5 – 7

 

This adjustment is needed in the following situations:

* When the color shift occurs.

* When the LSU unit is replaced.

* When the LSU unit is removed from the main unit.

* When a color image registration mistake occurs.

* When the unit is installed or when the installing site is changed.

(Required depending on the cases.)

* When there is an uneven density area or a difference in color

balance in the main scanning direction (back and forth).

* When the color phase is not matched by the color balance

adjustment.

* When the OPC drum drive unit is replaced.

* When the primary transfer unit is replaced.

The image skew adjustment (LSU unit) is performed by changing
the parallelism of the LSU unit scan laser beams for the OPC drum.

NOTE: Before execution of the this adjustment, perform the follow-

ing procedures in advance for better efficiency of the
adjustment.

The black (K) image skew, however, must be properly
adjusted for that.

1)

In the SIM50-22 mode, select ALL mode to perform the auto-
matic image registration adjustment.

2)

The current skew level is displayed on the SKEW display
menu.

3)

Put down the displayed skew level value.

(Meaning of the skew level value)

* When nothing is displayed in front of “SKEW_*”, turn the skew

adjustment screw (LSU) clockwise by the value (angle).

* When "-" is displayed in front of “SKEW_*”,, turn the skew adjust-

ment screw (LSU) counterclockwise by the value (angle).

NOTE: The K (Black) image skew level cannot be checked with

SIM50-22.

1)

Make a copy of the servicing color test chart (UKOG-
0326FCZZ/UKOG-0326FC11) by folding the chart in half, and
check that they are proper.

[Check with the servicing color test chart (UKOG-0326FCZZ/
UKOG-0326FC11)]

In the copy color balance check with the servicing color test
chart, check to insure the following conditions.

MX-C301  ADJUSTMENTS  5 – 8

a. Color copy check items (Check to confirm the following:) 

         

When using the servicing color test chart, fold or separate the
chart. 

a)

There are 8 void areas.

b)

Registrations (one point for the main scanning, and one
point for the sub scanning) are not shifted.

c)

The resolution of 5.0  can be seen.

d)

The color difference in gray balance between the F and
the R sides is not so great.

e)

There are no white and black streaks.

f)

Color texts are clearly reproduced.

g)

The background density is not so light.

MX-C301  ADJUSTMENTS  5 – 9

b. Monochrome copy check items (Check to confirm the following:) 

When using the servicing color test chart, fold or separate the chart. 

a)

There are 8 void areas.

b)

The resolution of 4.0 can be seen.

c)

The density difference between the F and the R sides is
not so great.

d)

There are no white and black streaks.

e)

The background density is not so light.

f)

The black low-density gradation is copied slightly.

MX-C301  ADJUSTMENTS  5 – 10

2)

 If the printing result has no skew part, this is the end of the
procedure. Skew adjustment does not need to be done. If the
printing result has skew areas, proceed to the next step.  

3)

 Remove the paper tray. 

4)

If there are several skewed areas on the test printing result,
turn all the LSU skew adjustment screws shown in the figure  *
To make "SKEW_*" values in the following ranges, turn the
LSU skew adjustment screws clockwise direction (a) or coun-
terclockwise direction (b).  
SKEW_C : +/-30, SKEW_M : +/-40, SKEW_Y : +/-20

5)

Fix the paper tray.

6)

Repeat the procedures 2) to 4) again, and check to confirm
that C, M, and Y (SKEW) result in "OK" being displayed on the
operation panel.

If any of them is NG, turn the LSU skew adjustment screw of
the corresponding color to adjust.

1)

Enter SIM61-4 mode.

2)

 Select the tray with A4 (11" x 8.5") paper in it.

3)

Press [EXECUTE] key.

      The check pattern is printed out.

4)

Remove the paper tray. 

5)

If there are several skewed areas on the test printing result,
turn all the LSU skew adjustment screws shown in the figure  *
To make "SKEW_*" values in the following ranges, turn the
LSU skew adjustment screws clockwise direction (a) or coun-
terclockwise direction (b). 
SKEW_C : +/-30, SKEW_M : +/-40, SKEW_Y : +/-20

6)

Fix the paper tray. 

7)

Repeat the procedures 2) to 4) again, and check to confirm
that C, M, and Y (SKEW) result in "OK" being displayed on the
operation panel.

If any of them is NG, turn the LSU skew adjustment screw of
the corresponding color to adjust.

C

M

Y

B

A

C

M

Y

B

A

C

M

Y

B

A

C

M

Y

B

A