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MX-M1100  PHOTOCONDUCTOR SECTION  i – 1

This section charges the OPC drum with a negative charge. 

1

Charger wire

Charges the OPC drum.

2

Screen grid

Charges the OPC drum evenly.

3

OPC drum

Forms electrostatic latent images by laser beams. Forms toner images from the electrostatic latent images 
through the developing process. 

4

Main high voltage PWB

Outputs the main charger voltage. 

MCCM

Charger wire cleaning 
motor

Drives the charger wire cleaner. 

DC brush motor

MCHPS

Charger wire cleaner 
home position sensor

Detects the home position of the charger wire cleaner. 

Transmission type photo 
sensor

DESS

Surface potential sensor

Detects the OPC drum surface potential after exposure and after non-
exposure. 

Feed-back type drum surface 
potential sensor

DM

OPC drum motor

Drives the OPC drum, the OPC drum cleaner section, and the transfer 
section. 

DC brushless motor

MCHPS1

MCHPS1

MCCM

MCCM

1

2

3

3

1

2

4

DM

DM

DESS

DESS

DESS

DESS

DSW-F-HV

1

B16B-PASK

CN1

13

DSW-F-HV

13

GND2

2

14

GND2

14

GND2

3

15

GND2

15

XGBPWM

4

16

XGBPWM

16

XMHVREM

5

17

XMHVREM

17

MHV-T

6

18

MHV-T

18

HVREMout

15

27

HVREMout

27

+24V_A

16

28

+24V_A

28

1

B2P-VH

GB

2

GB

9

DSW-F-HV

B40B-PNDZS-1

CN-3

11

GND2

13

GND2

15

XGBPWM

17

XMHVREM

19

MHV-T

37

HVREMout

40

CN_LEDin3

MHV

High voltage PWB unit

(Main)

+24V_A

11

36B-PNDZS-1

CN-9

DESS

12

11 +24V_A

11

13

GND2

B40B-PNDZS-1

CN-21

GND2

13

12 DESS

12

GND2

14

13 GND2

13

1

+24V_A

15

+5V_C

14 GND2

14

2

DESS

3

GND2

17

XDM

4

GND2

19

DMCLK

21

DM-T

MCCMA

21

MCCMB

22

MCHPS1

23

GND2

24

+5V_MCHPS1

25

24 MCCMA

24

25 MCCMB

25

26 MCHPS1

26

27 GND2

27

28 +5V_MCHPS1 28

1

MCCMB

1

2

MCCMA

2

1

MCCMA

1

2

MCCMB

2

3

MCHPS1

3

1

MCHPS1

4

GND2

4

2

GND2

5

+5V_MCHPS1

5

3

+5V_MCHPS1

PCU PWB

3

GND1

B10B-PASK-1(LF)(SN)

CN7

8

+38V0

HL PWB

38V0

1

GND1

2

GND2

1

+5V_C

2

XDM

3

DMCLK

4

DM-T

5

5

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

GND1

5

6 +38V0

6

MX-M1100  PHOTOCONDUCTOR SECTION  i – 2

The screen grid is attached to the main charger unit, and the OPC
drum is charged at a voltage virtually similar to the voltage applied
to the screen grid.

The front surface potential on the OPC drum is detected after
charging and exposure. The drum surface is detected by potential
sensor to ensure its specified charge level.
The output (DESS) of the drum surface potential sensor is inputted
to the PCU PWB. The main charger grid voltage control signal
(XGBPWM) duty is varied by the PCU PWB so that the OPC drum
surface potential is specified level. 
The main charger ON/OFF is controlled by the signal (XMHVREM).

The main charger wire is cleaned by the charger wire cleaner at the
specified interval. The charger wire cleaner is reciprocated once for
one cleaning operation. 
The cleaning operation can be also executed with Sim. 6-4.
The charger wire cleaner is driven by the charger wire cleaning
motor (MCCM), and the home position of the charger wire cleaner
is detected by the sensor (MCHPS1). 

In this section, laser beams are exposed onto the negatively
charged OPC drum surface to form electrostatic latent images. 
When laser beams are exposing the CGL of the OPC drum, posi-
tive and negative electric charges are generated. The positive
charged generated on the CGL are attracted and shifted by nega-
tive electric charges on the OPC drum surface. On the other hand,
negative charges are attracted and shifted by positive charges in
the aluminum layer of the OPC drum. 
Therefore, positive and negative charges are counterbalanced
each other on the surface and in the aluminum layer of the OPC
drum, reducing positive and negative charges and lowering the
OPC drum surface potential. 
In the section where laser beams are not exposed, negative
charges remain. 
Through this operation, electrostatic latent images are formed on
the OPC drum surface. 

COPY

- 590v

- 610v

PRINTER

- 590v

- 610v

FAX

- 590v

- 610v

MHV

GB

OPC drum

CTL
CGL
Aluminum
layer

Screen grid

Transfer high
voltage unit

PCU
PWB

Transfer high voltage unit

MHV

GB

DESS

DESS

Feed back

Feed back

XABPWM/XMHVREM

XABPWM/XMHVREM

DESS

DESS

MCHPS1

MCHPS1

MCCM

MCCM

OPC drum

Laser beam

CTL

CGL

Aluminum
layer

MX-M1100  PHOTOCONDUCTOR SECTION  i – 3

When paper is not separated from the OPC drum naturally, the separation pawl separates paper mechanically. 

1

OPC drum separation pawl

Separates paper from the OPC drum. 

2

Separation pawl oscillation shaft drive cam 

Converts the drive power of the OPC drum motor into the reciprocating rotation power of the separation 
pawl oscillation shaft. 

PSPS

Separation pawl solenoid

Drives the separation pawl. 

Solenoid

PSPS

PSPS

1

1

1

1

2

2

1

1

2

2

PCU PWB

1 XPSPS

1

2 XPSPS

2

2

SMR-07V-B/SMP-07V-BC

+24V_A

2

1 +24V_A

SMR-02V-N/SMP-02V-NC

1

XPSPS

36B-PNDZS-1

CN-9

2

1 XPSPS

1

+24V_A

3

2 +24V_A

2

MX-M1100  PHOTOCONDUCTOR SECTION  i – 4

When paper is not separated from the OPC drum naturally, the separation pawl separates paper mechanically. 
The separation pawl is driven by the separation solenoid (XPSPS), and is in contact with the OPC drum when paper passes through the trans-
fer section. 
In the other cases, the separation pawl is separated from the OPC drum.
In addition, the separation pawl operates in conjunction with the separation solenoid and oscillates back and forth.

PSPS

PSPS

PSPS

PSPS