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MX-M1100  DEVELOPING SECTION  K – 1

MX-M1100

Service Manual

 

In this section, toner is attracted to electrostatic latent images generated in the exposure section, forming visible images. 

1

Developer roller

Forms a magnetic brush with developer, and forms toner images on the OPC drum. 

2

Developing doctor

Controls the thickness and the quantity of developer and toner (magnetic brush) on the MG roller to the proper 
levels. 

3

Toner mixing roller 
(Developing section) 

Mixes and circulates developer (carrier) and toner to uniformize the toner density and to charge toner negatively.

4

Main high voltage PWB

Outputs the developing bias voltage.

TCS

Toner density sensor

Detects the toner density in the developing tank. The magnetic sensor is employed. 

Magnetic sensor

DVM

Developing motor

Drives the developing unit. 

DC brushless motor

4

TCS

TCS

DVM

DVM

2

1

3

3

1

TCS

3

3

3

B40B-PNDZS-1

CN-21

GND2

5 +5V_C

7 XDVM
9 DVMCLK

11 DVM-T

38V0

1

GND1

2

GND2

1

+5V_C

2

XDVM

3

DVMCLK

4

DVM-T

5

1

SMR-10V-N/SMP-10V-NC

1

GND1

1

B10B-PASK-1(LF)(SN)

CN-7

GND1

2

+38V0

2

6 +38V0

HL PWB

1

DVBS

B2P-VH

2

DVBS

DSW-F-HV

B16B-PASK

CN1

1

13

DF1B-28DES-2.5RC

DF1B-28DEP-2.5RC

DSW-F-HV

13

GND2

2

14 GND2

14

GND2

3

15 GND2

15

XDVPWM

13

25 XDVPWM

25

XDVREM

14

26 XDVREM

26

HVREMout

15

27 HVREMout

27

+24V_A

16

28 +24V_A

28

9

B40B-PNDZS-1

CN-3

DSW-F-HV

11 GND2
13 GND2
33 XDVPWM
35 XDVREM

37 HVREMout
39 +24V_A

4

B30B-PNDZS-1

CN-8

TSGOUT

6 +24V_A
8 TCS

10 GND2

TSGOUT

1

1 TSGOUT

1

1 TSGOUT

1

1 TSGOUT

1

+24V_A

2

2 +24V_A

2

2 +24V_A

2

2 +24V_A

2

TCS

3

3 TCS

3

3 TCS

3

3 TCS

3

GND2

4

4

SMP-04V-NC/SMR-04V-N

GND2

4

4

TSDP-12V-K

TSDR-12V-K

GND2

4

4

DF1B-14DEP-2.5RC / DF1B-14DES-2.5RC

GND2

4

PCU PWB

High voltage
PWB unit

(Main)

MX-M1100  DEVELOPING SECTION  K – 2

Toner and carrier in the developing unit are mixed and transported.
At that time, toner is charged negatively by mechanical contact with
carrier. 
This process is known as triboelectrification. The suffix tribo means
to rub in Greek, thus triboelectrification simply means to electrify (or
charge) by rubbing, or by contact. Interestingly, it is not friction that
results in the charging process, but rather a chemical reaction that
occurs between the two dissimilar materials. By rubbing the two
materials together a larger surface area is contacted resulting in a
greater exchange in charge. 
In addition, the developing bias voltage is applied to the developing
roller. 
Negatively charged toner is attached to the exposed section on the
OPC drum surface (where the negative potential is reduced) by the
developing bias voltage. 
On the other hand, the surface potential of the non-exposed sec-
tion on the OPC drum surface is higher than the developing bias,
and toner is not attached to that section. Through this operation,
visible images are formed on the OPC drum with toner. 

Immediately after starting rotation of the OPC drum and when the
developing roller is stationary, the reverse bias (positive voltage) is
applied to the developing roller, preventing unnecessary toner from
attaching to the OPC drum. 

By changing the developing bias voltage control signal (XDVPWM)
duty, the polarity and the output voltage are controlled. 

The developing bias voltage ON/OFF is controlled with the signal
XDVREM. 
The toner density sensor (TCS) is provided in the lower section of
the developing section to always detect the toner density. 
This signal is inputted to the PCU PWB, which controls the toner
supply quantity from the toner hopper and the toner bottle so that
the proper density is always maintained. 

1)

Open the front cover (a), and pull out the toner tray (b) slightly.

COPY

-500v

PRINTER

-500v

FAX

-500v

When not developing

+150v

OPC drum

CTL

CGL

Aluminum
layer

TCS

Developing
mode

Cleaning
mode

DVBS

-500v

+150v

Development unit

A

ATC sensor

K - 3/a

A

a

b

MX-M1100  DEVELOPING SECTION  K – 3

2)

Remove the screw (a), and remove the cover (b).

3)

Remove the blue screw (a), and remove the plate (b).

4)

Slide the developing unit (a) to the right, and pull it out until it
stops.

5)

Hold the handle (a) of the developing unit, and lift it up to
remove completely.
* When placing the developing unit, use the stand (b) and

place the unit on it.

1)

Remove the development unit

2)

Disconnect the connector (a), and remove the screw (b).
Remove the cover (c).
* Use extra care not to foul the connecter (a) terminal section. 

3)

Disconnect the connector (a), and remove the screw (b).
Remove the ATC sensor (c).
* Use extra care not to foul the connecter (a) terminal section. 

a

a

b

a

a

a

b

a

b

a

a

b

c

a

b

c