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DX-C401  ADJUSTMENTS  4 – 9

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 "R" is displayed in front of the value, turn the skew adjust-

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

* When "L" is displayed in front of the value, 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)

Enter SIM61-4 mode.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

2)

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

3)

Press [EXECUTE] key.
The check pattern is printed out.

4)

Check the printed black image for any skew.
There are following two methods of checking the black image
for any skew (right angle).
Method 1: 
Measure the length of the diagonal lines of the rectangle print
pattern. Check the difference in the length of the diagonal lines
for judgment of good or no good
Method 2: 
Compare the right angle of vertical side/horizontal side of the
rectangle print pattern and the right angle sides of A4 (11" x
8.5") paper for judgment of good or no good.
(NOTE)
In the case of Method 2, the right angle of paper to be used
may not be exact. Be sure to check the right angle of paper to
be used in advance.
(Method 1)
a) Measure the length of the diagonal lines of the rectangle 

print pattern.

b) Calculate the difference between the measured lengths C 

and D of the diagonal lines.

c) Check to insure that the difference between C and D is in 

the following range.
C – D = 

0.8mm

If the difference between C and D is in the above range, there
is no need to adjust.

(Method 2)
a) Fit the side of A4 or 11" x 8.5" paper to the long side of the rectangle print pattern.

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Diagonal line C

Diagonal line D

B

A

B

A

Lead edge inclination ( 0.5mm or less)

Rear edge inclination ( 0.5mm or less)

DX-C401  ADJUSTMENTS  4 – 10

b) Measure the shift distance between vertical side of paper 

and side of the rectangle print pattern.
If the above distances (left and right) are 0.5mm or less, 
there is no need to adjust.
If not, execute the following procedures.

5)

Open the front cabinet, and remove the waste toner box.

6)

Turn the LSU unit image skew adjustment screw (K) to adjust.
(When Method 1 is used to check the black image for any
skew (right angle) in procedure 4 in advance)
Diagonal line C is longer than diagonal line D: Turn the adjust-
ment screw clockwise.
Diagonal line C is shorter than diagonal line D: Turn the adjust-
ment screw counterclockwise.
(When Method 2 is used to check the black image for any
skew (right angle) in procedure 4 in advance)
When the image is skewed in the arrow direction A, turn the
adjustment screw clockwise. When the image is skewed in the
arrow direction B, turn the adjustment screw counterclockwise.

7)

Install the waste toner box, and close the front cabinet.

8)

Perform the procedures 3) - 4).
(Perform the procedures 3) - 8) until a satisfactory result is obtained.)

9)

Enter the SIM50-22 mode to select the adjustment item of
ALL, and press [EXECUTE] key.
The image registration adjustment is automatically performed and the adjustment data are displayed. Write down the display contents of
SKEW C, M, and Y.

10) Turn the image skew adjustment screw of the target color to adjust.

(When the adjustment is performed with the skew level value of SIM50-22 as the reference)
* When "R" is displayed in front of the value of SKEW, turn the skew adjustment screw (LSU) clockwise by the number (angle).
* When "L" is displayed in front of the value of SKEW, turn the skew adjustment screw (LSU) counterclockwise by the number (angle).

11) Enter the SIM61-4 mode and perform the procedures of 2) - 3). 

Check the printed color image skew pattern.

In each Y/M/C color print pattern printed separately in the F side and in the R side, note the same print color pattern and check to confirm
that the front frame side and the rear frame side are in the same condition.
Rough adjustment pattern check:
Check the sub scan rough adjustment color image shift check section on the R side and the F side of each color, use the black scale of "0"
as the center reference, and check the balance in shifts of the color image line positions in the positive and the negative directions. The
balance in the R side must be the same as that in the F side.

K

b

a

A-sub

B-sub

A-main

B-main

The sub scan rough adjustment color image shifts

on the R side and the F side are in the same balance

both in the rough adjustment check section and

the fine adjustment check section

R side

F side

Color image shift check

section (Rough adjustment)

C (Image shift fine adjustment reference frame)

Color image shift check

scale (Fine 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

DX-C401  ADJUSTMENTS  4 – 11

Fine adjustment pattern check:
Check the square frames on the R side and the F side of each
color. (Normally five sections of high density can be seen.)
Check the sub scanning direction position of the center area of
high density (one of the above five sections). These must be
on the same position on the R side and the F side.
In this case, use the sub scan direction color image shift check
scale (fine adjustment) as the reference.
Visually check the color density and make the darkest section
as the center, and use it as the read value of the shift amount.
Check that the difference in the center position of the dark den-
sity section is within 

2 step.

The positional relations of the front and the rear frame of the
print color patterns of a same color are compared. There is no
need that all the colors are in the same state. Compare only
the positional relations of color patterns of a same color.
If the above condition is not met, do the following:

12) Turn the image skew adjustment screw of the target color to

adjust.
Relationship between the adjustment screw rotating angle and
the change in the adjustment image position:
Adjustment screw rotating angle (degree) = Image shift
amount (Adjustment scale) x 10

Repeat procedures 11) - 12) until a satisfactory result is obtained.

 

This adjustment is needed in the following situations:
* When the color shift occurs.
* When the photoconductor drum is replaced.
* When the OPC drum is removed from the main unit.
* When the OPC drum drive section is disassembled.
* When the OPC drum drive unit is replaced.
* U2 trouble has occurred.
* When the PCU MAIN PWB is replaced.
* When EEPROM on the PCU MAIN PWB is replaced.
* When the color image sensor (image registration sensor F) is

replaced.

* When the color image sensor (image registration sensor R) is

replaced.

* When the registration sensor unit is replaced.

 

1)

Enter SIM50-22 mode.
(4.3 Inch LCD model)

Y

M

C

b

a

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EXECUTE

Adjustment completed

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DX-C401  ADJUSTMENTS  4 – 12

(8.5 Inch LCD model)

2)

Press [ALL] key.
(The machine enters the OPC drum phase adjustment mode/
image registration adjustment (auto adjustment) mode, and
both adjustments are executed simultaneously in this mode.)
The OPC drum phase adjustment and the image registration
adjustment can be individually executed by [REGIST] button
and [DRUM POS] button. Since, however, the image registra-
tion adjustment must be executed when the OPC drum phase
adjustment is completed, both adjustment are executed in this
adjustment simultaneously.

3)

Press [EXECUTE] key.
The OPC drum phase adjustment and the image registration
adjustment are executed automatically.

* After completion of the adjustment, the drum motor stops and

[EXECUTE] button returns to the normal display and the adjust-
ment result is displayed. 

* When terminated abnormally, "ERROR" and the content are dis-

played.

* For details, refer to SIM50-22.
When an error occurs, check the following conditions.
* OPC drum drive section 
* Transfer belt drive section
* Paper feed drive section
* Each motor speed set value (Set value of SIM48-6)

 

This adjustment is needed in the following situations:
* When the LSU (writing) unit is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
* When the color shift occurs.
1)

Go through the modes specified in Simulation 50-10.
(4.3 Inch LCD model)

(8.5 Inch LCD model)

2)

Select A4 (11" x 8.5") paper.

3)

Press [EXECUTE] key.
The check pattern is printed out.

4)

Check that the inside dimension of the printed half tone is 140
0.5mm.

If the above requirement is not met, do the following steps.

5)

Change the set value of set item A BK-MAG.
When the set value is changed by 1, the dimension is changed
by 0.1mm.
When the set value is increased, the BK image magnification
ratio in the main scanning direction is increased. When the set
value is decreased, the BK image magnification ratio in the
main scanning direction is decreased.

Repeat procedures 2) - 5) until a satisfactory result is obtained.

EXECUTE

Adjustment completed

Abnormal end

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