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MX-4101N  ADJUSTMENTS  5 – 11

5)

Open the process front cover, and pull out the primary transfer
belt unit.

6)

Install the color image density sensor (image registration sen-
sor F) calibration jig (UKOG-0318FCZZ) to the sensor housing
section.
Engage the pawls (A) in the sensor housing groove, and slide
it to the rear frame side.

NOTE: Be careful not to damage the PTC terminal.

7)

Turn on the power and enter SIM44-13 mode.

8)

Close the right cover unit (secondary transfer unit section).

9)

Install the waste toner bottle to the main unit.

10) Close the front cabinet.
11) Press [EXECUTE] key.

Color image sensor (image registration sensor F) calibration is
automatically executed. When the operation is completed, the
adjustment result is displayed and [EXECUTE] key returns to
the normal display.

If the adjustment is not completed normally, "ERROR" is displayed.
In that case, check the following sections for any abnormality. If any
abnormality is found, repair and execute calibration again.
If an error occurs, the adjustment result is not revised.
• Color image density sensor
• PCU  PWB
• Image sensor calibration jig (standard reflection sheet dirt,

scratch, discoloration)

• Image density sensor calibration plate

NOTE: Store the image sensor calibration jig under low tempera-

ture, low humidity and dark place.

 

NOTE: This adjustment executes automatically at the outset of

registration adjustment operation and process control oper-
ation as well as SIM44-2.

1)

Enter SIM44-2 mode.

2)

Press [EXECUTE] key.
The color image density sensor (image registration sensor F),
the black image density sensor (image registration sensor R)
are automatically adjusted.
After completion of the adjustment, the adjustment result is
displayed and [EXECUTE] key returns to the normal display.

EXECUTE

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PCS_CL 
CARB OUT

Color image density sensor 
LED current adjustment 
target value

1 - 255

108

B

PCS_CL 
LED ADJ

Color image density sensor 
LED current adjustment 
target value (PCS CL CARB 
OUT) registered LED current 
level

1 - 255

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MX-4101N  ADJUSTMENTS  5 – 12

If the adjustment is not completed normally, "ERROR" is dis-
played.

When an error occurs, check the following sections for any
abnormality.
• Color image density sensor (image registration sensor F)
• Black image density sensor (image registration sensor R)
• PCU PWB
• Transfer belt (dirt, scratch)
• Transfer belt cleaner
• Color image sensor calibration plate

If any abnormality is found, repair and adjust again.
If an error occurs, the adjustment result is not revised.

Adjustment 
value for 
process 
control 
operation 
mode

A

PCS_CL 
LED ADJ

Color image sensor 
light emitting quantity 
adjustment value

1 - 255

21

B

PCS_K 
LED ADJ

Black image sensor 
light emitting quantity 
adjustment value

1 - 255

21

C

PCS_CL 
DARK

Dark voltage of color

0 - 255

0

D

PCS_K 
DARK

Dark voltage of black

0 - 255

0

E

PCS_K 
GRND

Belt base detection 
level when 
completion of Item B 
adjustment

0 - 255

0

F

PCS_K 
BELT 
MAX

Maximum value of 
belt base detection 
level

0 - 255

0

G

PCS_K 
BELT MIN

Minimum value of 
belt base detection 
level

0 - 255

0

H

PCS_K 
BELT DIF

Belt base detection 
level difference 
(Item E - Item F)

0 - 255

0

Adjustment 
value for 
image 
registration 
operation 
mode

I

REG_F 
LED ADJ

Image registration 
sensor light emitting 
quantity adjustment 
value F

1 - 255

56

J

REG_R 
LED ADJ

Image registration 
sensor light emitting 
quantity adjustment 
value R

1 - 255

56

K

REG_F 
DARK

Image registration 
sensor dark voltage 
F

0 - 255

0

L

REG_R 
DARK

Image registration 
sensor dark voltage 
R

0 - 255

0

M

REG_F 
GRND

Belt base detection 
level when 
completion of Item I 
adjustment

0 - 255

0

N

REG_R 
GRND

Belt base detection 
level when 
completion of Item J 
adjustment

0 - 256

0

O

REG_F 
BELT 
MAX

Maximum value of 
belt base detection 
level (F side)

0 - 255

0

P

REG_F 
BELT
 MIN

Minimum value of 
belt base detection 
level (F side)

0 - 255

0

Q

REG_F 
BELT 
DIF

Belt base detection 
level difference 
(Item O - Item P)

0 - 255

0

R

REG_R 
BELT 
MAX

Maximum value of 
belt base detection 
level (R side)

0 - 255

0

S

REG_R 
BELT 
MIN

Minimum value of 
belt base detection 
level (R side)

0 - 255

0

T

REG_R 
BELT 
DIF

Belt base detection 
level difference 
(Item R - Item S)

0 - 255

0

U

REG_F 
PATCH 
(K)

Patch detection level 
F for check (K)

0 - 255

0

V

REG_F 
PATCH 
(C)

Patch detection level 
F for check (C)

0 - 255

0

W

REG_F 
PATCH 
(M)

Patch detection level 
F for check (M)

0 - 255

0

X

REG_F 
PATCH 
(Y)

Patch detection level 
F for check (Y)

0 - 255

0

Adjustment 
value for 
image 
registration 
operation 
mode

Y

REG_R 
PATCH 
(K)

Patch detection level 
R for check (K)

0 - 55

0

Z

REG_R 
PATCH 
(C)

Patch detection level 
R for check (C)

0 - 255

0

AA

REG_R 
PATCH 
(M)

Patch detection level 
R for check (M)

0 - 255

0

AB

REG_R 
PATCH 
(Y)

Patch detection level 
R for check (Y)

0 - 255

0

Adjustment 
value for 
process 
control 
operation 
mode

BK_SEN_ADJ
_ERR

Black image 
density 
sensor 
adjustment 
abnormality

PCS_K LED ADJ error 
(The target value is not 
obtained after retried 
three times.)

CL_SEN_ADJ
_ERR

Color image 
sensor 
adjustment 
abnormality

PCS_CL LED ADJ 
error (The target value 
is not obtained after 
retried three times.)

BELT_READ
_ERR

Transfer belt 
surface 
reading 
abnormality

PCS_K GRND error 
(The surface detection 
level is maximum or 
the minimum value 
difference is outside a 
reference range. )

Adjustment 
value for 
image 
registration 
operation 
mode

REG_SEN_F
_ADJ_ERR

Registration 
sensor F 
adjustment 
abnormality

REG_F LED ADJ error 
(The target value is not 
obtained after retried 
three times.)

REG_SEN_R
_ADJ_ERR

Registration 
sensor R 
adjustment 
abnormality

REG_R LED ADJ error 
(The target value is not 
obtained after retried 
three times.)

REG_BELT_F
_READ_ERR

F side 
transfer belt 
surface 
reading 
abnormality

REG_F GRND error 
(The surface detection 
level is maximum or 
the minimum value 
difference is outside a 
reference range. )

REG_BELT_R
_READ_ERR

R side 
transfer belt 
surface 
reading 
abnormality

REG_R GRND error 
(The surface detection 
level is maximum or 
the minimum value 
difference is outside a 
reference range. )

MX-4101N  ADJUSTMENTS  5 – 13

 

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.

NOTE: This adjustment can be executed efficiently by executing

the following procedures in advance.
The black (K) image skew, however, must be properly
adjusted for that.

1)

Press [REGIST] button in SIM50-22 mode to execute 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 and click the

skew adjustment screw (LSU) clockwise by the number of the
value.

* When "L" is displayed in front of the value, turn and click the

skew adjustment screw (LSU) counterclockwise by the number
of the value.

At that time, the fractional part after the decimal point is rounded.

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

this adjustment.
To check and adjust the K (black) image skew, follow the
procedures below and execute the adjustment.

1)

Enter SIM61-4 mode.

2)

Select the paper feed tray with A3 (11" x 17") paper in it by
changing the value of set item B.

3)

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

4)

Check the printed black image for any skew.
Measure the right angle level by using the six cross patterns
printed in black.
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 A3 or 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.

or end of print

EXECUTE

EXECUTE

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Diagonal line D

Diagonal line C

MX-4101N  ADJUSTMENTS  5 – 14

(Method 2)
a) Fit the side of A3 or 11" x 17" paper to the long side of the
rectangle print pattern.

b) Measure the shift distance between vertical side of paper
and side of the rectangle print pattern.
If the above distance is 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)

Loosen the LSU unit fixing screws (2 pcs.) and shift the skew
adjustment screw in the arrow direction to adjust the LSU (writ-
ing) unit skew.
(When Method 1 is used to check the black image for any
skew (right angle) in procedure 4 in advance)
When the lengths of the diagonal line are C > D, shift the
adjustment screw in the direction of Y.
When the lengths of the diagonal line are C < D, shift the
adjustment screw in the direction of X.
(When Method 2 is used to check the black image for any
skew (right angle) in procedure 4 in advance)
If the image is skewed in the arrow direction of A, shift the
adjustment screw to X direction. If the image is skewed in the
arrow direction of B, shift the adjustment screw to Y direction.

7)

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

8)

Execute procedures 3) - 4).
(Repeat procedures 5) - 8) until a satisfactory result is
obtained.)

9)

If the adjustment result reaches the satisfactory level, tighten
the adjustment screw.
(The black image skew adjustment is completed with the
above.)

10) In the above black image skew adjustment, check the color

image skew pattern printed when completion of the adjust-
ment.

*A: Rough adjustment print pattern
*B: Fine adjustment print pattern

In each Y/M/C color print pattern printed separately in the front
frame direction and in the rear frame direction, note the same
print color pattern and check to confirm that the difference in
the highest density sections is within 

±1 step.

(Compare the front and the rear frame positions of the same-
color print color patterns. All the highest density sections of all
the print color patterns may not be aligned on a line. Compare
only the same-color patterns.)
If the above condition is not met, do the following:

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

adjust.

When each adjustment screw is turned, it clicks. Turn it by
5 - 6 clicks and the check pattern is changed by 1 step (1
dot size).
When the image skew pattern on the front frame side is
skewed in the arrow direction of A (to the smaller number) from
the rear frame side, turn the adjustment screw counterclock-
wise. When the image is skewed in the arrow direction of B (to
the larger number), turn the adjustment screw clockwise.

12) Print the check pattern.
13) Check the color image skew pattern.

Repeat procedures 11) - 13) until a satisfactory result is obtained.
The image skew adjustment (LSU unit) is executed by changing
the parallelism of the LSU unit scan laser beam for the OPC drum.

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0.5mm or less

Comparison line

Direction

B

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Direction B

Direction A

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