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MX-7000N  PHOTOCONDUCTOR SECTION  J – 3

CFM

Charger air inlet fan motor

Sends air to the charge unit of OPC drum unit (BK)

TBBOX

Waste toner box sensor

Detects the installation state of the waste toner box

TNFD

Waste toner full detection

Detects the waste toner full

WTM

Waste toner drive motor

Stirs waste toner

1

Waste toner transport screw

Transports the waste toner to the transport pipe

2

Waste toner transport pipe

Transports the waste toner to the waste toner box

3

Waste toner transport screw

Transports the waste toner from the waste toner pipe to the waste toner box

4

Waste toner box

Receives waste toner when copying or printing, and collects it

TNFD

TBBOX

WTM

CFM

1

1

2

3

4

CN5

P

SM-7pin

R

P

DF1B-20DE

S

P

DF1B-34DE

S

CN3

S8B-ZR-SM4

PAP

PA-3pin

PALR

PCU

PWB

B34B-PNDZS-1

CN8

GP1A71L3

PHR-3

B40B-PNDZS-1

CN6

QSW-Z0538

PHR-3

B40B-PNDZS-1

2

5VNPD

3

12

P-GND

12

1

D-GND

TNFD

28

P-GND

8

CFM

8

10

CFM

26

CFM_LD

/WTM_CLK

3

4

/WTM_D

4

P-GND

1

/WTM_LD

1

2

/WTM_CW

2

3

13

CFM

24

28

28

26

24

24

20

5VNPD(LED)

TNFD

33

34

D-GND
5VNPD

30

9

D-GND

19

TBBOX

2

GND

/WTM_LD

14

/WTM_CW

12

5

7

/WTM_D

7

5

/WTM_CLK

11

1

3

/WTM_CW

3

1

/WTM_LD

5V3

9

18

/WTM_LD

2

/WTM_CW

3

5V3

5

6

P-GND

/WTM_CLK

/WTM_D

INT24V2

8

P-GND

7

4
5

5V3

6

7

4
2

INT24V2

INT24V2

7

6

13

P-GND

11

5

CFM_LD

10

9

16

/WTM_CLK

/WTM_D

16

/WTM_CLK

16

INT24V2

12

/WTM_LD

12

14

/WTM_CW

14

18

/WTM_D

18

4

P-GND

4

2

INT24V2

2

CFM_LD

2

P-GND

3

3

CFM

2

1

1

P-GND

26

CFM_LD

D-GND

2

TBBOX

3

5VNPD(LED)

1

DF11-8DP-SP1

(B)

5

5

5VN

5

5VN

5VN

1

5VN

6

MX-7000N  PHOTOCONDUCTOR SECTION  J – 4

The OPC drum surface is negatively charged by the charge unit.
The laser beam images are radiated to the OPC drum surface by
the laser (writing) unit to form latent electrostatic images.
1)

The OPC drum surface is negatively charged by the charge
unit.

The charge unit is provided with the screen grid. The OPC
drum is charged at a voltage virtually same as the voltage
applied to the screen grid.

2)

Laser lights are radiated to the OPC drum surface by the laser
(writing) unit to form latent electrostatic images.

When laser lights are radiated to the OPC drum CGL, negative
and positive charges are generated.
Positive charges generated in CGL are attracted to the nega-
tive charges on the OPC drum surface. At the same time, neg-
ative charges are attracted to positive charges in the aluminum
layer of the OPC drum.
Therefore, positive charges and negative charges are bal-
anced out on the OPC drum and in the aluminum layer, reduc-
ing positive and negative charges to decrease the OPC drum
surface voltage.
Electric charges remain at a position where laser lights are not
radiated.
As a result, latent electrostatic images are formed on the OPC
drum surface.

3)

After transfer operation, remaining toner is removed by the
cleaning blade.
Toner removed from the OPC drum surface is transported to
the waste toner section by the waste toner transport screw.

4)

The whole surface of the OPC drum is discharged.

By radiating the discharge lamp light to the discharge lens,
light is radiated through the lens to the OPC drum surface.
When the discharge lamp light is radiated to the OPC drum
CGL, positive and negative charges are generated.
Positive charges generated in CGL are attracted to the nega-
tive charges on the OPC drum surface. On the other hand,
negative charges are attracted to positive charges in the alumi-
num layer of the OPC drum.
Therefore, positive and negative charges are balanced out on
the OPC drum surface and in the aluminum layer, reducing
positive and negative charged to decrease the surface voltage
of the OPC drum.

Aluminum

layer

OPC drum

CTL

CGL

High voltage unit

Main corona unit

Screen grid

Aluminum
layer

OPC drum

Laser lights

OPC drum

CGL
CTL

CGL

CGL

Aluminum

layer

Aluminum

layer

CTL

CTL

lens

MX-7000N  PHOTOCONDUCTOR SECTION  J – 5

1)

Remove the development unit (CL). (Refer to the "[L] DEVEL-
OPING SECTION".)

2)

Hold the lock lever (A), and pull out OPC drum unit (CL) gently,
and remove OPC drum unit (CL) (B) while supporting the lower
section with both hands.

1)

Remove the development unit (CL). (Refer to the "[L] DEVEL-
OPING SECTION".)

2)

Remove the OPC drum unit (CL). (Refer to the "(1) OPC durm
unit (CL)".)

3)

Remove the screws (A), and remove the fixing shaft (B).

4)

Slide the drum (CL) to the front side, and lift the OPC drum
rear side (C), and remove the drum (CL) (D) from the hole in
the front section.
* When installing, apply stearin acid to the drum (CL) surface

(E).

A

OPC drum unit (CL) 

J - 5

B

OPC drum unit (BK) 

J - 7

C

Waste toner section

J -12

1

OPC drum 
unit (CL) 

a

Drum (CL)

▲

J - 5

b

Charge unit

▲

J - 6

c

Side seal F (CL)

✕

J - 6

d

Side seal R (CL)

✕

e

Toner reception seal (CL)

✕

f

Cleaner blade (CL)

▲

g

Toner mixing sheet

▲

1

OPC drum unit (CL) 

1

OPC drum unit (CL) 

a

Drum (CL)

▲

MX-7000N  PHOTOCONDUCTOR SECTION  J – 6

1)

Remove the development unit (CL). (Refer to the "[L] DEVEL-
OPING SECTION".)

2)

Remove the OPC drum unit (CL). (Refer to the "(1) OPC durm
unit (CL)".)

3)

Remove the drum (CL). (Refer to the "a. Drum (CL)".)

4)

Remove the screws (A), and remove the cover (B).

5)

Remove the lock pawl (C) with a screwdriver, and remove the
MC cleaner shaft (D).

6)

Disengage the pawl (E), and remove the cover (F). Remove
the Charge unit (G).
* When installing the cover (F), be careful so that the other

side of the side with the pawl doesn't separate.

1)

Remove the development unit (CL). (Refer to the "[L] DEVEL-
OPING SECTION".)

2)

Remove the OPC drum unit (CL). (Refer to the "(1) OPC durm
unit (CL)".)

3)

Remove the drum (CL). (Refer to the "a. Drum (CL)".)

4)

Remove the Charge unit. (Refer to the "b. Charge unit".)

5)

Remove the side seal F (CL) (A), the side seal R (CL) (B), and
the toner reception seal (CL) (C).

1

OPC drum unit (CL) 

b

Charge unit (CL)

▲

1

OPC drum unit (CL) 

c

Side seal F (CL)

✕

d

Side seal R (CL)

✕

e

Toner reception seal (CL)

✕

f

Cleaner blade (CL)

▲

g

Toner mixing sheet

▲