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MX-B381/B401  ADJUSTMENTS  4 – 3

 

This adjustment is needed in the following situations:
* When the TC high voltage PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.

1)

Go through the modes specified in Simulation 8-6.

2)

Select an item to be adjusted.
Enter the adjustment value (specified value), and press [OK]
key.
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
By setting the default value (specified value), the specified out-
put is provided.

 

NOTE: Before executing this adjustment, check to confirm the fol-

lowing items.

* Check to confirm that the image density sensor is clean.
* Check to confirm that the transfer belt is clean and free from

scratches.

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.

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2.

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A

TC1 LOW SPEED BW K

Primary transfer bias 
reference value

Low speed mode

51 - 255

95

2 - 30

A

8

A

B

TC1 MIDDLE SPEED BW K

Middle speed mode

51 - 255

131

2 - 30

A

13

A

C

TC2 PLAIN BW SPX

Secondary transfer 
bias reference value

Standard 

paper mode

Front surface mode

51 - 255

111

–2 - –80

A

–25

A

D

TC2 PLAIN BW DPX

Back surface mode

51 - 255

111

–2 - –80

A

–25

A

E

TC2 HEAVY BW SPX

Heavy paper 

mode

Front surface mode

51 - 255

93

–2 - –80

A

–10

A

F

TC2 HEAVY BW DPX

Back surface mode

51 - 255

93

–2 - –80

A

–10

A

G

TC2 OHP BW 

OHP

51 - 255

85

–2 - –80

A

–8

A

H

TC2 ENVELOPE BW

Envelope

51 - 255

124

–2 - –80

A

–30

A

I

TC2 THIN BW

Thin paper

51 - 255

111

–2 - –80

A

–25

A

J

TC2 GLOSSY BW

Gloss paper

51 - 255

72

–2 - –80

A

–10

A

K

TC2 CLEANING

Cleaning mode

51 - 255

67

–2 - -80

A

–8

A

L

TC2 CLEAN LOW SPD

Secondary transfer 
cleaning bias 
reference value

Low speed print mode

0 - 255

16

–100V - 1500V

0V

M

TC2 CLEAN MIDDLE SPD

Middle speed print mode

0 - 255

16

–100V - 1500V

0V

N

TC2 CLEAN CLEANING 

Cleaning mode

0 - 255

143

–100V - 1500V

800V

O

PTC LOW SPEED BW

PTC current output 
reference value

Low speed mode

0 - 255

133

0

A - –700A

–300

A

P

PTC MIDDLE SPEED BW

Middle speed mode

0 - 255

133

0

A - –700A

–300

A

Q

CASE VOLT LOW BW

PTC case voltage 
reference value

Low speed mode

0 - 255

0

0V - –1000V

0V

R

CASE VOLT MID BW

Middle speed mode

0 - 255

0

0V - –1000V

0V

S

PEEL VOLT LOW BW

Separation discharge 
reference value

Low speed mode

51 - 255

200

 –50 - –3000V

–2200V

T

PEEL VOLT MIDDLE BW

Middle speed mode

51 - 255

200

 –50 - –3000V

–2200V

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MX-B381/B401  ADJUSTMENTS  4 – 4

2)

Press [EXECUTE] key.
The image density sensor is automatically adjusted.
After completion of the adjustment, the adjustment result is
displayed and [EXECUTE] key returns to the normal display.

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

When an error occurs, check the following sections for any
abnormality.
• Image density sensor
• PCU PWB
• Transfer belt (dirt, scratch)
• Transfer belt cleaner

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

 

This adjustment is needed in the following situations:
* When the LSU unit is replaced.
* When the LSU unit is removed from the main unit.
The image skew adjustment (LSU unit) is performed by changing
the parallelism of the LSU unit scan laser beams for the OPC drum.
1)

Enter SIM64-2 mode.
Set the set items to the values shown below.
A: 1 B: 1 C: 254 D: 255

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 image for any skew.
There are following two methods of checking the 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.

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

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.)

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2.

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MX-B381/B401  ADJUSTMENTS  4 – 5

(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.

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 to adjust.
(When Method 1 is used to check the 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 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.)

 

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.
1)

Go through the modes specified in Simulation 50-10.

2)

Select A4 (11" x 8.5") paper.

3)

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

Diagonal line D

Diagonal line C

Direction B

Direction A

Comparison line

0.5mm or ress

K

A

B

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MX-B381/B401  ADJUSTMENTS  4 – 6

4)

Check that the inside dimension of the printed half tone is 120
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.

 

This adjustment is needed in the following situations:
* When the LSU is replaced or removed.
* When a paper tray is replaced.
* When the paper tray section is disassembled.
* When [ADJ 4] print engine image magnification ratio (BK) (main

scanning direction) is performed.

* When the manual feed tray is replaced.
* When the manual feed tray is disassembled.
* When the switchback section is disassembled.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
(Note)
Before execution of this adjustment, check to insure the following
item.
* Check that the print engine image magnification ratio adjustment

(BK) (main scanning direction) has been properly adjusted.

1)

Enter SIM50-10 mode.

2)

Select a target paper feed tray to be adjusted with the scroll
keys.

3)

Set A4 (11" x 8.5") paper in the paper feed tray selected in pro-
cedure 2).

4)

Press [EXECUTE] key.
The adjustment pattern is printed.

5)

Check that the adjustment pattern image is printed in the cor-
rect position.
Measure the dimension of the void area in the front and the
rear frame direction of the adjustment pattern, and check that
all the following conditions are satisfied.

RV: REAR VOID AREA
FV: FRONT VOID AREA

RV + FV 

 8.0mm

RV = 3.0 

 2.0mm

FV = 3.0 

 2.0mm

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

A

BK-MAG

Main scan print 
magnification ratio BK

60 - 140

100

120 0.5mm

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B

MAIN-MFT

Print off center adjustment 
value (Manual paper feed)

1 - 99

65

C

MAIN-CS1

Print off center adjustment 
value (Tray 1)

1 - 99

65

D

MAIN-CS2

Print off center adjustment 
value (Tray 2)

1 - 99

50

E

MAIN-CS3

Print off center adjustment 
value (Tray 3)

1 - 99

50

F

MAIN-CS4

Print off center adjustment 
value (Tray 4)

1 - 99

50

G

MAIN-ADU

Print off center adjustment 
value (ADU)

NOTE:

Before execution of 
this adjustment, 
check to insure that 
the adjustment 
items A - F have 
been properly 
adjusted. If not, this 
adjustment cannot 
be made properly.

1 - 99

50

H

SUB-MFT

Registration 
motor ON
Timing 
adjustment

Manual 
paper feed

1 - 99

60

I

SUB-CS1

Standard
tray

1 - 99

60

J

SUB-DSK

DESK 1 

- 

99

50

K

SUB-ADU

ADU

1 - 99

50

L

MULTI COUNT

Number of print

1 - 999

1

M

PAPER

MFT

Tray 
selection

Manual paper 
feed

1 - 5

1

2 (CS1)

CS1

Tray 1

2

CS2

Tray 2

3

CS3

Tray 3

4

CS4

Tray 4

5

N

DUPLEX

YES

Duplex 
print 
selection

Yes

0 - 1

0

1 (NO)

NO

No

1

3.0 2.0mm

RV

3.0 2.0mm

FV