MX-4100N, MX-4101N, MX-5000N, MX-5001N (serv.man13). Service Manual-Section 5-Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 10

MX-4101N  ADJUSTMENTS  5 – 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).

AB

TC2 CLEAN LOW SPD

Secondary 
transport 
cleaning bias 
reference value

In low speed print

0 - 255

0

0V - –1500V

0V

AC

TC2 CLEAN MIDDLE SPD

In middle speed print

0

0V

AD

TC2 CLEAN CLEANING 

Cleaning

85

–500V

AE

VPTC LOW SPEED CL

PTC applied 
voltage control 
(AC constant 
voltage setting)

Color

Low speed

0 - 255

100

0 - (1.94) - 4.01KV

2.47KV

AF

VPTC MIDDLE SPEED CL

Middle speed

100

2.47KV

AG

VPTC LOW SPEED BK

Black/White

Low speed

100

2.47KV

AH

VPTC MIDDLE SPEED BK

Middle speed

100

2.47KV

AI

FPTC LOW SPEED CL

PTC applied 
voltage control 
(frequency 
setting value)

Color

Low speed

1 - 255

192

0.5KHz - 1.5KHz

0.5KHz

AJ

FPTC MIDDLE SPEED CL

Middle speed

192

0.5KHz

AK

FPTC LOW SPEED BK

Black/White

Low speed

192

0.5KHz

AL

FPTC MIDDLE SPEED BK

Middle speed

136

0.7KHz

AM

DCPTC LOW SPEED CL

PTC applied 
voltage control 
(DC constant 
voltage setting 
value)

Color

Low speed

0 - 255

93

0 - (0.68) - 2.14KV

–1.0KV

AN

DCPTC MIDDLE SPEED CL

Middle speed

149

–1.4KV

AO

DCPTC LOW SPEED BK

Black/White

Low speed

149

–1.4KV

AP

DCPTC MIDDLE SPEED BK

Middle speed

149

–1.4KV

AQ

PTC_HT

PTC heater 
operating 
environment 
setting

0: OFF

1-6: Environment conditions

(TC environment table 6 steps)

0 - 6

1

Always ON

AR

HT_DUTY

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

0: OFF

 10: Lighting-up fully

(10 steps)

0 - 10

5

0% - 100%

50%