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MX-C300P  ADJUSTMENTS  5 – 3

2)

Select an item to be adjusted.

Enter the adjustment value (specified value), and press [OK]
key. 

When [OK] key is pressed, the voltage entered in the proce-
dure 3 is outputted for 30sec and the set value is saved.

When [OK] key is pressed, the output is stopped.

By setting the default value (specified value), the specified out-
put is provided.

 

There are some parts variations in the image density sensor sec-
tion. Therefore, the absolute detection level differs in each
machine. To correct this, calibration is executed.

This adjustment is needed in the following situations:

* When the color image density sensor (image registration sensor

F) is replaced.

* When the image registration sensor unit is replace.

* U2 trouble has occurred.

The targets of the adjustment are the color image density sensor
(image registration sensor F) and the black image density sensor
(image registration sensor R). There are following adjustment
methods.

* Black image density sensor (image registration sensor R) cali-

bration SIM44-2

NOTE: The color image density sensor detects color image density

and image registration on front frame side, the black image
density sensor detects black image density and image reg-
istration on rear frame side. That is, two functions is
assigned to each one sensor.

Before executing this adjustment, check to confirm the fol-
lowing items.

* Check to confirm that the color image density sensor (image reg-

istration sensor F) and the black image density sensor (image
registration sensor R) are clean.

* Check to confirm that the image density sensor calibration plate

is clean.

* Check to confirm that the transfer belt is clean and free from

scratches.

1

TC1

T1 LO CL K

Primary transfer bias 
adjustment value

Color mode

K

Low speed mode

0 to 255

95

2

T1 MI CL K

Middle speed mode

0 to 255

146

3

T1 LO CL CMY

CMY

Low speed mode

0 to 255

139

4

T1 MI CL CMY

Middle speed mode

0 to 255

186

5

T1 LO BW K

Black/White mode

K

Low speed mode

0 to 255

95

6

T1 MI BW K

Middle speed mode

0 to 255

146

1

TC2

T2 PLN CL S

Secondary transfer bias 
adjustment value

Color mode

Standard 
paper mode

Front surface mode

0 to 255

103

2

T2 PLN CL D

Back surface mode

0 to 255

96

3

T2 PLN BW S

Black/White mode

Front surface mode

0 to 255

90

4

T2 PLN BW D

Back surface mode

0 to 255

83

5

T2 HEV1 CL S

Color mode

Heavy paper 
mode

Front surface mode

0 to 255

83

6

T2 HEV1 CL D 

Back surface mode

0 to 255

76

7

T2 HEV1 BW S

Black/White mode

Front surface mode

0 to 255

76

8

T2 HEV1 BW D

Back surface mode

0 to 255

69

9

T2 OHP CL

Color mode

OHP

0 to 255

69

10

T2 OHP BW 

Black/White mode

0 to 255

69

11

T2 ENV CL

Color mode

Envelope

0 to 255

69

12

T2 ENV BW

Black/White mode

0 to 255

69

13

T2 THIN CL

Color mode

Thin paper

0 to 255

96

14

T2 THIN BW

Black/White mode

0 to 255

90

15

T2 GLOS CL

Color mode

Gloss paper

0 to 255

83

16

T2 GLOS BW

Black/White mode

0 to 255

76

1

TC2 
CLEA
N

T2 MNS CLEAN 

Secondary transfer 
cleaning bias adjustment 
value

Cleaning mode (-)

0 to 255

59

2

T2 PLS CLEAN 

Cleaning mode (+)

0 to 255

119

3

T2 COUNTER

Counter (+)

0 to 255

119

4

T2 BTWN LO

Low speed print mode (+)

0 to 255

0

5

T2 BTWN MI

Middle speed print mode (+)

0 to 255

0

MX-C300P  ADJUSTMENTS  5 – 4

 

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.

2)

Press [[OK] 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 [HOME] 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.

? Color image density sensor (image registration sensor F)

? Black image density sensor (image registration sensor R)

? MFP  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.

 

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)

1

P_F_CL_ka

F side color sensor correction factor

2

P_F LED ADJ

F sensor light emitting quantity adjustment 
value

3

P_R LED ADJ

R sensor light emitting quantity adjustment 
value

4

P_F_CL_DARK

Dark voltage of color (F side)

5

P_F DARK

Dark voltage of sensor (F side)

6

P_R DARK

Dark voltage of sensor (R side)

7

P_F GRND

Belt substrate when the item D adjustment 
is completed.

8

P_F BELT MAX

Belt substrate input max. value

9

P_F BELT MIN

Belt substrate input min. value

10

P_R GRND

Belt substrate when the item F adjustment 
is completed.

11

P_R BELT MAX

Belt substrate input max. value

12

P_R BELT MIN

Belt substrate input min. value

13

REG_F BELT MAX

Belt substrate input max. value (F side)

14

REG_F BELT MIN

Belt substrate input min. value (F side)

15

REG_R BELT MAX

Belt substrate input max. value (R side)

16

REG_R BELT MIN

Belt substrate input min. value (R side)

17

REG_F PATCH(K)

Patch light receiving potential F(K)

18

REG_F PATCH(C)

Patch light receiving potential F(C)

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2.67$57

Adjustment is finished.

19

REG_F PATCH(M)

Patch light receiving potential F(M)

20

REG_F PATCH(Y)

Patch light receiving potential F(Y)

21

REG_R PATCH(K)

Patch light receiving potential R(K)

22

REG_R PATCH(C)

Patch light receiving potential R(C)

23

REG_R PATCH(M)

Patch light receiving potential R(M)

24

REG_R PATCH(Y)

Patch light receiving potential R(Y)

CL_SEN_ADJ_ERR 

Color image sensor adjustment abnormality

BK_SEN_ADJ_ERR 

Black image density sensor adjustment 
abnormality

P_F_CL_ka 

F side image sensor adjustment abnormality

P_F_GRND 

Belt base detection level when completion of 
Item F adjustment abnormality

P_R_GRND 

Belt base detection level when completion of 
Item R adjustment abnormality

REG_F_LED_ADJ 

Registration sensor F adjustment abnormality

REG_R_LED_ADJ

Registration sensor R adjustment abnormality

REG_F_GRND 

Belt base detection level (F side) abnormality

REG_R_GRND

Belt base detection level (R side) abnormality

MX-C300P  ADJUSTMENTS  5 – 5

* 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.

a)

Enter SIM61-4 mode.

b)

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

c)

Press [OK] key.

The check pattern is printed out.

d)

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.

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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MX-C300P  ADJUSTMENTS  5 – 6

1)

Enter SIM61-4 mode.

2)

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

3)

Press [OK] key.

      The check pattern is printed out. 

Fit the side of A4 or 11" x 8.5" paper to the long side of the rect
   angle print pattern.

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.

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.

8)

 When the adjustment is made by turning the LSU skew 
   adjustment screw of K, the states of C, M and Y (SKEW) are 
   changed. Execute SIM50-22 to check to confirm that C, M,
and Y 
   (SKEW) result in "OK" being displayed on the operation
panel. 
   Image registration adjustment is done automatically and 
   SKEW _C, M, Y value is displayed.  

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"

!

"

!

Lead edge inclination ( 0.5mm or less)

Rear edge inclination ( 0.5mm or less)

C

M

Y

B

A

C

M

Y

B

A