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MX-3100N  ADJUSTMENTS  6 – 8

Remark: 
Normally when the default value is set, the specified voltage is out-
putted.
The adjustment value of each color mode is specified on the label
attached to the MC/DV high voltage power PWB. Enter that value.

DVK:XXX DVC:XXX  DVM:XXX  DVY:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.
To adjust all the modes individually, first adjust the middle speed
mode, and then adjust the other mode.
If the middle speed mode is adjusted after adjustment of all the
modes individually, the adjustment values of the other modes are
automatically changed. Use care for that.
Therefore, unless there may be an abnormality in the output volt-
age, there is no need to check the output value.
If it must be checked that the normal voltage is outputted or if an
adjustment is required by referring to the output voltage, follow the
procedures below.
1)

Remove the rear cover of the machine.

2)

Open the PWB frame.

3)

Go through the modes specified in Simulation 8-1.

4)

Select an output mode to be adjusted with the mode key and
the scroll key.

5)

Check the relationship between the check pin on the MC/DV
high voltage PWB and each adjustment mode.

6)

Apply a digital multi-meter to between the check pin and GND
on the MC/DV high voltage PWB corresponding to the
adjusted mode.

7)

Press [EXECUTE] key.
The main charger voltage is outputted for 30sec.

8)

Check the monitor voltage with the digital multi-meter.
If the monitor voltage is not in the range of the specified values
shown in the table above, change the adjustment value and
adjust. If the specified value voltage is not obtained even
though the adjustment value is changed, the following parts
may be defective.
• MC/DV high voltage PWB
• PCU PWB
• Development unit
• OPC drum unit
• High voltage circuit electrode

MX-3100N  ADJUSTMENTS  6 – 9

 

This adjustment is needed in the following situations:
* When the primary transfer high voltage power PWB or Second-

ary transfer high voltage power 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 a mode to be adjusted with the scroll key.

3)

Enter an adjustment value (specified value) and press [OK]
key. 
By setting the default value (specified value), the specified
voltage is outputted.
When [EXECUTE] key is pressed, the transfer voltage is out-
putted.

EXECUTE

EXECUTE

or after 30 sec.

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A

TC1 LOW SPEED CL K

Primary transport 
bias reference 
value

Color

K

In low speed

51 - 255

80

2

µA – 30µA

6

µA

B

TC1 MIDDLE SPEED CL K

In middle speed

51 - 255

109

2

µA – 30µA

10

µA

C

TC1 LOW SPEED CL C

C 

In low speed

51 - 255

80

2

µA – 30µA

6

µA

D

TC1 MIDDLE SPEED CL C

In middle speed

51 - 255

109

2

µA – 30µA

10

µA

E

TC1 LOW SPEED CL M

M

In low speed

51 - 255

80

2

µA – 30µA

6

µA

F

TC1 MIDDLE SPEED CL M

In middle speed

51 - 255

109

2

µA – 30µA

10

µA

G

TC1 LOW SPEED CL Y

Y

In low speed

51 - 255

80

2

µA – 30µA

6

µA

H

TC1 MIDDLE SPEED CL Y

In middle speed

51 - 255

109

2

µA – 30µA

10

µA

I

TC1 LOW SPEED BW K

Black/White

K

In low speed

51 - 255

80

2

µA – 30µA

6

µA

J

TC1 MIDDLE SPEED BW K

In middle speed

51 - 255

109

2

µA – 30µA

10

µA

K

TC2 PLAIN CL SPX

Secondary 
transport bias 
reference value

Color

Standard 

paper

Front surface

51 - 255

130

2

µA – 100µA

40

µA

L

TC2 PLAIN CL DPX

Back surface

51 - 255

120

2

µA – 100µA

35

µA

M

TC2 PLAIN BW SPX

Black/White

Front surface

51 - 255

99

2

µA – 100µA

25

µA

N

TC2 PLAIN BW DPX

Back surface

51 - 255

99

2

µA – 100µA

25

µA

O

TC2 HEAVY CL SPX

Color

Heavy 

paper

Front surface

51 - 255

78

2

µA – 100µA

15

µA

P

TC2 HEAVY CL DPX 

Back surface

51 - 255

78

2

µA – 100µA

15

µA

Q

TC2 HEAVY BW SPX

Black/White

Front surface

51 - 255

78

2

µA – 100µA

15

µA

R

TC2 HEAVY BW DPX

Back surface

51 - 255

68

2

µA – 100µA

10

µA

S

TC2 OHP CL

Secondary 
transport bias 
reference value

Color

OHP

51 - 255

78

2

µA – 100µA

15

µA

T

TC2 OHP BW 

Black/White

51 - 255

68

2

µA – 100µA

10

µA

U

TC2 ENVELOPE CL

Color

Envelope

51 - 255

78

2

µA – 100µA

15

µA

V

TC2 ENVELOPE BW

Black/White

51 - 255

78

2

µA – 100µA

15

µA

W

TC2 CLEANING

Cleaning process

51 - 255

63

2

µA – 100µA

8

µA

X

TC2 CLEAN LOW SPD

Secondary 
transport cleaning 
bias reference 
value

In low speed print

0 - 255

0

0V – -1500V

0V

Y

TC2 CLEAN MIDDLE SPD

In middle speed print

0 - 255

0

0V – -1500V

0V

Z

TC2 CLEAN CLEANING 

Cleaning

0 - 255

85

0V – -1500V

-500V

MX-3100N  ADJUSTMENTS  6 – 10

 

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 image density sensor (image registration sensor) is

replaced.

* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
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.
* Color image density sensor (image registration sensor F) calibra-

tion SIM44-13

* 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)

Open the front cabinet of the main unit, and remove the waste
toner box.

2)

Remove the primary transfer unit fixing screw.

3)

Turn to the transfer belt tension release cam and release the
primary transfer belt tension.

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)

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

AA

VPTC LOW SPEED CL

PTC applied 
voltage control 
(AC constant 
voltage setting)

Color

In low speed

0 - 255

100

0V – 4KV

2.5KV

AB

VPTC MIDDLE SPEED CL

In middle speed

0 - 255

100

0V – 4KV

2.5KV

AC

VPTC LOW SPEED BK

Black/White

In low speed

0 - 255

100

0V – 4KV

2.5KV

AD

VPTC MIDDLE SPEED BK

In middle speed

0 - 255

100

0V – 4KV

2.5KV

AE

FPTC LOW SPEED CL

PTC applied 
voltage control 
(frequency setting 
value)

Color

In low speed

1 - 255

184

0.5KHz – 2KHz

0.5KHz

AF

FPTC MIDDLE SPEED CL

In middle speed

1 - 255

184

0.5KHz – 2KHz

0.5KHz

AG

FPTC LOW SPEED BK

Black/White

In low speed

1 - 255

184

0.5KHz – 2KHz

0.5KHz

AH

FPTC MIDDLE SPEED BK

In middle speed

1 - 255

131

0.5KHz – 2KHz

0.5KHz

AI

DCPTC LOW SPEED CL

PTC applied 
voltage control 
(DC constant 
voltage setting 
value)

Color

In low speed

0 - 255

93

0V – 2KV

-1.0KV

AJ

DCPTC MIDDLE SPEED CL

In middle speed

0 - 255

149

0V – 2KV

-1.4KV

AK

DCPTC LOW SPEED BK

Black/White

In low speed

0 - 255

149

0V – 2KV

-1.4KV

AL

DCPTC MIDDLE SPEED 
BK

In middle speed

0 - 255

149

0V – 2KV

-1.4KV

AM

PTC_HT

PTC heater 
operating 
environment 
setting

    0: OFF
1-6: Environment conditions

0 - 6

1

Always ON

AN

HT_DUTY

Setting of the 
supply power in 
PTC heater 
constant operation
 (Duty ratio setting)

   0: OFF
 10: Lighting-up fully

0 - 10

5

0% – 100%

50%

MX-3100N  ADJUSTMENTS  6 – 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

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