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MX-C400P/C380P, MX-B400P/B380P/B382P  ADJUSTMENTS  4 – 8

3) Open the front cover.

Check to confirm that the belt tension of the primary transfer
unit is released (the separation lever of the primary transfer
unit is under the state shown in the figure).
If the belt tension is not released, turn the separation lever to
the state shown in the figure.

CAUTION: When the transfer belt tension of the primary transfer

unit is released manually, turn on the power again after
completion of the work. This procedure initializes the
transfer roller to return it to the home position.

4) Turn the lock lever until it stops to release the lock, and

remove the waste toner box.

5) Open the right door.
6) Put the lock lever horizontally, release the lock, and pull out the

primary transfer unit until it stops.

7)

Hold the handle, push the lock on the left side of the primary
transfer unit and remove the primary transfer unit.

8)

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

9)

Install the waste toner box, and close the right door and the
front cover.

10) With [EXECUTE] button selected, press [OK] key.

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

If the adjustment is not completed normally, "ERROR" is displayed.
When an error occurs, the adjustment result is not revised.
In that case, check the following sections for any abnormality. If any
abnormality is found, repair and execute calibration again.
* Color image density sensor (image registration sensor F)
* 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.

A

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

21

MX-C400P/C380P, MX-B400P/B380P/B382P  ADJUSTMENTS  4 – 9

: ’11/Mar/15

 

NOTE: This adjustment executes automatically at the outset of

registration adjustment operation and process control oper-
ation as well as SIM44-2.
Normally, therefore, it is not required to perform this adjust-
ment. It is performed only when the sensor is replaced or
when the adjustment result is checked.

1) Enter SIM44-2 mode.

• MX-C400P/C380P

• MX-B400P/B380P/B382P

2) Press [EXECUTE] button.

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] button returns to the normal dis-
play.

• MX-C400P/C380P

Adjustment 
value for 
process 
control 
operation 
mode

A

PCS_CL 
LED ADJ

Color sensor light 
emitting quantity 
adjustment value

1 - 255

21

B

PCS_K 
LED ADJ

Black 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 substrate when 
the item B 
adjustment is 
completed.

0 - 255

0

F

PCS_K 
BELT 
MAX

Belt substrate input 
max. value

0 - 255

0

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Adjustment 
value for 
process 
control 
operation 
mode

G

PCS_K 
BELT MIN

Belt substrate input 
min. value

0 - 255

0

H

PCS_K 
BELT DIF

Belt substrate input 
difference (Item F - 
Item G)

0 - 255

0

Adjustment 
value for 
image 
registration 
operation 
mode

I

REG_F 
LED ADJ

Registration sensor 
light emitting quantity 
adjustment value F

1 - 255

32

J

REG_F 
DARK

Registration sensor 
dark voltage F

0 - 255

0

K

REG_F 
GRND

Belt substrate when 
the item I adjustment 
is completed.

0 - 255

0

L

REG_R 
LED ADJ

Registration sensor 
light emitting quantity 
adjustment value R

1 - 255

32

M

REG_R 
DARK

Registration sensor 
dark voltage R

0 - 255

0

N

REG_R 
GRND

Belt substrate when 
the item L 
adjustment is 
completed.

0 - 256

0

O

REG_F 
BELT 
MAX

Belt substrate input 
max. value (F side)

0 - 255

0

P

REG_F 
BELT MIN

Belt substrate input 
min. value (F side)

0 - 255

0

Q

REG_F 
BELT DIF

Belt substrate input 
difference (Item O - 
Item P)

0 - 255

0

R

REG_R 
BELT 
MAX

Belt substrate input 
max. value (R side)

0 - 255

0

S

REG_R 
BELT MIN

Belt substrate input 
min. value (R side)

0 - 255

0

T

REG_R 
BELT DIF

Belt substrate input 
difference (Item R - 
Item S)

0 - 255

0

U

REG_F 
PATCH 
(K)

Patch light receiving 
potential F(K)

0 - 255

0

V

REG_F 
PATCH 
(C)

Patch light receiving 
potential F(C)

0 - 255

0

W

REG_F 
PATCH 
(M)

Patch light receiving 
potential F(M)

0 - 255

0

X

REG_F 
PATCH 
(Y)

Patch light receiving 
potential F(Y)

0 - 255

0

Y

REG_R 
PATCH 
(K)

Patch light receiving 
potential R(K)

0 - 255

0

Z

REG_R 
PATCH 
(C)

Patch light receiving 
potential R(C)

0 - 255

0

AA

REG_R 
PATCH 
(M)

Patch light receiving 
potential R(M)

0 - 255

0

AB

REG_R 
PATCH 
(Y)

Patch light receiving 
potential R(Y)

0 - 255

0

MX-C400P/C380P, MX-B400P/B380P/B382P  ADJUSTMENTS  4 – 10

If the adjustment is not completed normally, "ERROR" is displayed.

• MX-B400P/B380P

• MX-B382P

If the adjustment is not completed normally, "ERROR" is displayed.

When an error occurs, check the following sections for any abnor-
mality.
• 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

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.)

A

PCS_K LED ADJ

Image density sensor light 
emitting quantity 
adjustment value

1 - 255

32

B

PCS_K DARK

Dark voltage

0 - 255

0

C

PCS_K GRND

Belt base detection level 
when completion of Item A 
adjustment

0 - 255

0

D

PCS_K BELT MAX

Maximum value of belt 
base detection level

0 - 255

0

E

PCS_K BELT MIN

Minimum value of belt 
base detection level

0 - 255

0

F

PCS_K BELT DIF

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

0 - 255

0

G

REG_R LED ADJ

Image density sensor light 
emitting quantity 
adjustment value

1 - 255

32

H

REG_R DARK

Image density sensor dark 
voltage

0 - 255

0

I

REG_R GRND

Belt base detection level 
when completion of Item 
G adjustment

0 - 256

0

J

REG_R BELT MAX

Maximum value of belt 
base detection level

0 - 255

0

K

REG_R BELT MIN

Minimum value of belt 
base detection level

0 - 255

0

L

REG_R BELT DIF

Belt base detection level 
difference (Item J - Item K)

0 - 255

0

M

REG_R PATCH (K)

Patch detection level for 
check

0 - 255

0

A

PCS_K LED ADJ

Image density sensor light 
emitting quantity 
adjustment value

1 - 255

21

B

PCS_K DARK

Dark voltage

0 - 255

0

C

PCS_K GRND

Belt base detection level 
when completion of Item A 
adjustment

0 - 255

0

D

PCS_K BELT MAX

Maximum value of belt 
base detection level

0 - 255

0

E

PCS_K BELT MIN

Minimum value of belt 
base detection level

0 - 255

0

F

PCS_K BELT DIF

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

0 - 255

0

G

REG_R LED ADJ

Image density sensor light 
emitting quantity 
adjustment value

1 - 255

56

H

REG_R DARK

Image density sensor dark 
voltage

0 - 255

0

I

REG_R GRND

Belt base detection level 
when completion of Item G 
adjustment

0 - 256

0

J

REG_R BELT MAX

Maximum value of belt 
base detection level

0 - 255

0

K

REG_R BELT MIN

Minimum value of belt 
base detection level

0 - 255

0

L

REG_R BELT DIF

Belt base detection level 
difference (Item J - Item K)

0 - 255

0

M

REG_R PATCH (K)

Patch detection level for 
check

0 - 255

0

Image density sensor 
adjustment abnormality

PCS_K LED ADJ error 
The target is not reached by 3 times of retry.

Substrate scan 
abnormality

PCS_K GRND error 
Effective difference between the upper and 
lower values of the belt substrate circuit, 
outside the range

Registration sensor R 
adjustment abnormality

REG_R LED ADJ error 
The target is not reached by 3 times of retry.

Registration substrate R 
scan abnormality

REG_R GRND error 
Effective difference between the upper and 
lower values of the belt substrate circuit, 
outside the range

BK_SEN_ADJ
_ERR

Image density 
sensor adjustment 
abnormality

PCS_K 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.)

REG_SEN_R
_ADJ_ERR

Sensor adjustment 
abnormality

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

REG_BELT_R
_READ_ERR

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.)

: ’11/Mar/15

MX-C400P/C380P, MX-B400P/B380P/B382P  ADJUSTMENTS  4 – 11

: ’11/Mar/15

 

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 "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.

2)

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

3)

Select [EXECUTE] button, and press [OK] 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.

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Diagonal line C

Diagonal line D