Sharp MX-6240N / MX-7040N (serv.man32) Service Manual ▷ View online
MX-7040N OPERATIONAL DESCRIPTIONS 13 – 25
B. Operational descriptions
(1)
Outline
Image data sent from the image process circuit through the PCU
are converted into laser beams which are radiated to the surface of
the OPC drum.
are converted into laser beams which are radiated to the surface of
the OPC drum.
In this model, 4-laser system is employed where 4-laser diodes for
each color are radiated. The LSU unit is composed of the optical
element from laser to the polygon mirror, the primary system
including the mirror which assures light path, and the main scan-
ning system.
each color are radiated. The LSU unit is composed of the optical
element from laser to the polygon mirror, the primary system
including the mirror which assures light path, and the main scan-
ning system.
(2)
Composition
Primary system
Scanning system
* Though four laser beams are actually radiated for one color, they
are illustrated as one beam.
Main scanning direction
* Though four laser beams are actually radiated for one color, they
are illustrated as one beam.
(3)
Outline of LSU specifications
LD1 - 4
LD1 - 4
LD1 - 4
LD1 - 4
Scanning width:
310mm
Resolution:
1200dpi
Beam diameter:
Main scan = 50 to 80µm, Sub scan = 50 to 80µm
Laser power:
Max. 0.350
W/1beam
LD wavelength:
775 to 790nm
C
M
Y
BK
REAR
FRONT
LD1 - 4
Scanning
direction
direction
MX-7040N OPERATIONAL DESCRIPTIONS 13 – 26
7. OPC drum section
A. Electrical and mechanical relation diagram
DM_Y
DHPD_Y
CCMD_Y
DL2_Y
DL_Y
DL2_M
DL2_C
DL2_K
DL_M
DL_C
DL_K
CCHPD_M
CCHPD_C
CCHPD_K
CCMD_M
CCMD_C
CCMD_K
DHPD_M
DHPD_C
DHPD_K
DM_M
DM_C
DM_K
CCM_K
CCM_C
CCM_M
CCM_Y
CCHPD_Y
GB-K
MC-K
MC-C
GB-C
MC-M
GB-M
MC-Y
GB-Y
1
4
5
5
5
5
1
1
1
2
2
2
2
3
3
3
3
12
13
14
15
16
17
13
14
15
16
17
20
21
21
23
22
(NC)
5VNPD+R
P-GND
DM_C_CK
DM_C_D
DM_C_CK
DM_C_D
DHPD_C
24V3
GND
DM_C_CK
DM_C_D
DM_C_D
(NC)
23CSR-8PK
5VNPD+R
P-GND
DHPD_C
24V3
GND
DM_C_CK
1
2
6
8
9
11
10
10
3
7
1
11
10
9
2
3
4
5
6
3
4
5
6
1-179228-1
11XR-6H-P
5
4
3
2
1
7
6
DM_C_LD
24V3
P-GND
(NC)
P-GND
(NC)
(NC)
DM_C_CK
DM_C_D
CW/CCW
DM_C_D
CW/CCW
1
11
10
9
2
3
4
5
6
3
4
5
6
24V3
P-GND
DM_M_CK
DM_M_D
P-GND
DM_M_CK
DM_M_D
5VNPD+R
GND
DHPD_M
1
11
10
9
2
3
4
5
6
3
4
5
6
24V3
P-GND
P-GND
5VNPD+R
GND
DHPD_M
DM_M_D
DM_M_CK
B23B-CSRK
1
2
6
8
9
11
10
10
3
7
1-179228-1
11XR-6H-P
CN-19
5
4
3
2
1
7
6
24V3
DM_M_LD
P-GND
DM_M_CK
DM_M_D
CW/CCW
DM_M_D
CW/CCW
(NC)
(NC)
PAP-07V-S
B7B-PASK-1
1
11
10
9
8
7
2
3
4
5
6
3
4
5
6
23
22
24
25
26
27
28
29
30
31
25
26
27
28
29
30
31
31CSR-8PK
B31B-CSRK
CN-20
12
13
14
15
16
17
18
19
20
21
13
14
15
16
17
18
19
20
21
2
2
2
1
3
PHR-3
PHR-3
1
3
S
P
QR/P8-8*-C
1
2
5
6
4
3
3
7
8
1
2
5
6
4
3
3
7
8 (NC)
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
PHR-3
1
3
1
10
9
8
7
2
3
4
5
6
3
4
5
6
1
2
5
6
8
9
10
4
3
3
7
1
11
10
9
8
7
2
3
4
5
6
3
4
5
6
1
2
5
6
8
9
11
10
10
4
3
3
7
1-179228-1
1-179228-0
10XR-6H-P
11XR-6H-P
1
10
9
8
7
2
3
4
5
6
3
4
5
6
1
2
5
6
8
9
10
4
3
3
7
10XR-6H-P
1-179228-0
2
PHR-3
1
3
S
P
QR/P8-8*-C
1
2
5
6
4
3
3
7
8
1
2
5
6
4
3
3
7
8
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
PROCESS UN (MAGENTA)
PROCESS UN (YELLOW)
5
4
3
2
1
7
6
(NC)
2
PHR-3
1
3
2
1
3
PHR-3
PCU PWB
2
2
2
1
3
PHR-3
PHR-3
1
3
S
P
QR/P8-8*-C
1
2
5
6
4
3
3
7
8
1
2
5
6
4
3
3
7
8
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
PHR-3
1
3
1
10
9
8
7
2
3
4
5
6
3
4
5
6
1
2
5
6
8
9
10
4
3
3
7
GND
5VNPD+R
GND
5VNPD+R
CCMD_C
CCM_C_A
CCM_C_B
CCM_C_B
DL_C
CCHPD_C
DL2_C
GND
CCHPD_K
CCHPD_K
GND
GND
5VNPD+R
GND
GND
DL_K
DL2_K
GND
5VNPD+R
5VNPD+R
GND
5VNPD+R
CCMD_C
CCM_C_A
CCM_C_B
CCM_C_B
DL_C
CCHPD_C
22
23
24
25
26
27
28
29
23
24
25
26
27
28
29
31
30
DL2_C
GND
5VNPD+R
(NC)
(NC)
(NC)
(NC)
DL_K
DL2_K
CCHPD_K
DL2_K
CCHPD_K
1
11
10
9
2
3
4
5
6
3
4
5
6
P-GND
DM_K_CK
DM_K_D
DM_K_CK
DM_K_D
DHPD_K
5VNPD+R
GND
1
2
6
8
9
11
10
10
3
7
1
11
10
9
2
3
4
5
6
3
4
5
6
P-GND
DM_K_CK
DM_K_D
DM_K_CK
DM_K_D
DHPD_K
24V3
5VNPD+R
GND
B31B-CSRK
31CSR-8PK
1-179228-1
1-179228-0
10XR-6H-P
11XR-6H-P
1
10
9
8
7
2
3
4
5
6
3
4
5
6
1
2
5
6
8
9
10
4
3
3
7
CCMD_K
GND
GND
5VNPD+R
CCM_K_A
CCM_K_B
GND
DL_K
CCM_K_A
CCM_K_B
GND
DL_K
5VNPD+R
CCHPD_K
DL2_K
1-179228-0
10XR-6H-P
CCMD_K
GND
5VNPD+R
CCM_K_A
CCM_K_B
GND
DL_K
GND
5VNPD+R
CCM_K_A
CCM_K_B
GND
DL_K
5VNPD+R
CCHPD_K
12
13
14
15
16
17
18
19
20
21
13
14
15
16
17
18
19
20
21
DL
2_K
CN-18
2
PHR-3
1
3
S
P
QR/P8-8*-C
1
2
5
6
4
3
3
7
8
1
2
5
6
4
3
3
7
8
(NC)
GND
5VNPD+R
(NC)
(NC)
(NC)
(NC)
DL_C
DL2_C
CCHPD_C
DL2_C
CCHPD_C
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
(NC)
GND
GND
DL_C
GND
DL_C
PROCESS UN (CYAN)
PROCESS UN (BLACK)
5
4
3
2
1
7
6
DM_K_LD
24V3
P-GND
P-GND
(NC)
(NC)
DM_K_CK
DM_K_D
CW/CCW
DM_K_CK
DM_K_D
CW/CCW
PAP-07V-S
B7B-PASK-1
2
GND
GND
DL2_C
GND
DL2_C
PHR-3
1
3
2
1
3
PHR-3
GND
5VNPD+R
CCHPD_C
24V3
P-GND
DM_Y_CK
DM_Y_D
P-GND
DM_Y_CK
DM_Y_D
DVC_Y
24V3
DHPD_Y
GND
5VNPD+R
24V3
DHPD_Y
GND
5VNPD+R
CCMD_Y
GND
5VNPD+R
GND
5VNPD+R
CCM_Y_B
CCM_Y_A
5VNPD+R
CCHPD_Y
GND
DL_Y
DL2_Y
DL_Y
DL2_Y
CCMD_M
5VNPD+R
CCM_M_B
CCM_M_A
5VNPD+R
GND
DL_M
GND
DL2_M
CCHP_M
CCHP_M
DM_Y_CK
5VNPD+R
P-GND
24V3
DM_Y_D
DVC_Y
24V3
DHPD_Y
GND
24V3
DHPD_Y
GND
5VNPD+R
CCM_Y_B
CCM_Y_A
5VNPD+R
CCHPD_Y
CCMD_Y
GND
GND
GND
DL_Y
DL2_Y
DL_Y
DL2_Y
5VNPD+R
CCM_M_B
CCM_M_A
5VNPD+R
CCMD_M
GND
GND
GND
DL_M
DL2_M
CCHP_M
DL_M
DL2_M
CCHP_M
(NC)
GND
DL_Y
DL2_Y
GND
DL_Y
DL2_Y
5VNPD+R
CCHPD_Y
(NC)
(NC)
(NC)
24V3
P-GND
(NC)
DM_Y_CK
DM_Y_D
CW/CCW
DM_Y_LD
P-GND
(NC)
DM_Y_CK
DM_Y_D
CW/CCW
DM_Y_LD
GND
GND
DL_Y
GND
DL_Y
GND
GND
DL2_Y
GND
DL2_Y
GND
5VNPD+R
CCHPD_Y
GND
GND
DL_M
GND
DL_M
GND
GND
DL2_M
GND
DL2_M
GND
5VNPD+R
CCHPD_M
(NC)
GND
DL_M
DL2_M
GND
DL_M
DL2_M
5VNPD+R
CCHPD_M
(NC)
(NC)
(NC)
DM_K_LD
CW/CCW
DM_K_LD
CW/CCW
DM_Y_LD
CW/CCW
CW/CCW
DM_Y_LD
DM_Y_LD
DM_M_LD
CW/CCW
DM_C_LD
DM_M_LD
CW/CCW
DM_C_LD
DM_C_D
CW/CCW
CW/CCW
PAP-07V-S
B7B-PASK-1
PAP-07V-S
B7B-PASK-1
CW/CCW
24V3
7-292254-1
7-292254-0
7-292254-0
7-292254-0
7-292254-0
7-292254-1
7-292254-1
7-292254-1
1
3
5
7
9
3
5
7
9
11
13
15
17
19
13
15
17
19
GND
INT24V2
24V3
PNDP-40V-Z
B40B-PNDZS
CN-23(1/3)
/MC_LD2
/MC_DATA
/MC_CLK
/MC_LD
/MC_CLK
/MC_LD
HV_REM_MC
MCBKERR
MCCLERR
MCBKERR
MCCLERR
2
179228-3
D-GND
5VNPD+R
5VNPD+R
DHPD_C
1
3
179228-3
2
1
3
DHPD_M
5VNPD+R
D-GND
2
1
3
179228-3
DHPD_Y
D-GND
5VNPD+R
D-GND
5VNPD+R
2
1
3
179228-3
CCMD_Y
D-GND
5VNPD+R
5VNPD+R
1
3
3
CN-1
S3B-PH-K-S
S3B-PH-K-S
PHR-3
CCM_Y_A+
CCM_Y_B-
CCM_Y_B-
2
1
3
179228-3
CCMD_M
5VNPD+R
D-GND
1
3
3
CN-1
S3B-PH-K-S
S3B-PH-K-S
PHR-3
CCM_M_A+
CCM_M_B-
CCM_M_B-
1
3
3
CN-1
S3B-PH-K-S
CCM_C_A+
CCM_C_B-
CCM_C_B-
PHR-3
CN-1
1
3
3
S3B-PH-K-S
CCM_K_A+
CCM_K_B-
CCM_K_B-
PHR-3
2
1
3
179228-3
D-GND
DHPD_K
5VNPD+R
2
1
3
179228-3
D-GND
CCMD_K
5VNPD+R
2
1
3
179228-3
D-GND
CCMD_C
5VNPD+R
SRA-21T-3
SRA-21T-3
SRA-21T-3
SRA-21T-3
SRA-21T-3
SRA-21T-3
SRA-21T-3
SRA-21T-3
8
2
1
3
4
5
6
7
4
5
6
7
9
GND
CN-1
10
INT24V2
/MC_DATA
/MC_CLK
/MC_LD
/MC_LD2
HV_REM_MC
MCBKERR
MCCLERR
24V3
/MC_CLK
/MC_LD
/MC_LD2
HV_REM_MC
MCBKERR
MCCLERR
24V3
B10B-PASK-1
PAP-10V-S
VHR-2N
PS-250
VHR-2N
PS-250
VHR-2N
PS-250
VHR-2N
PS-250
MC-K
GB-K
GB-C
MC-C
MC-M
GB-M
MC-Y
GB-Y
1
1
1
1
MC PWB
MX-7040N OPERATIONAL DESCRIPTIONS 13 – 27
B. Operational descriptions
The OPC drum surface is negatively charged by the main charger.
The laser beam images are radiated to the OPC drum surface by
the laser (writing) unit to form latent electrostatic images.
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 main
charger.
charger.
The main charger grid is provided with the screen grid. The
OPC drum is charged at a voltage virtually same as the volt-
age applied to the screen grid.
OPC drum is charged at a voltage virtually same as the volt-
age 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.
(writing) unit to form latent electrostatic images.
When laser lights are radiated to the OPC drum CGL, negative
and positive charges are generated.
and positive charges are generated.
Positive charges generated on the CGL are attracted by the
negative charges on the OPC drum surface. On the other
hand, negative charges are attracted by the positive charges in
the aluminum layer of the OPC drum.
negative charges on the OPC drum surface. On the other
hand, negative charges are attracted by the 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.
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.
radiated.
As a result, latent electrostatic images are formed on the OPC
drum surface.
drum surface.
3)
After transfer operation, remaining toner is removed by the
cleaning blade.
cleaning blade.
Toner removed from the OPC drum surface is transported to
the waste toner section by the waste toner transport screw.
the waste toner section by the waste toner transport screw.
Signal name
Name
Function/Operation
CCHPD_KCMY
Charger cleaner home position sensor (K, C, M, Y)
Detects the charger cleaner home position.
CCMD_KCMY
Charger cleaner shift sensor (K, C, M, Y)
Detects and controls shift of the charger cleaner.
DHPD_KCMY
OPC drum rotation sensor (K, C, M, Y)
Detects rotation and the phase of the OPC drum.
DL
Discharge lamp
Discharges the OPC drum surface.
DL2
After-transfer discharge lamp
Discharges the OPC drum surface immediately after transfer.
DM_KCMY
Drum motor
Drives the cyan OPC drum.
GB
Grid bias
The OPC drum surface potential is controlled.
MC
Main charger
The OPC drum surface is charged negatively.
No.
Name
Function/Operation
1
OPC drum
Latent electrostatic images are formed.
2
Cleaning blade
Cleans and remove residual toner from the OPC drum surface.
3
Waste toner transport screw
Transports remaining toner in the OPC drum unit to the waste toner collection section.
4
Discharge lamp
Reduces the surface potential of the OPC drum.
5
After-transfer discharge lamp
Reduces the surface potential of the OPC drum immediately after transfer.
Aluminum
layer
OPC drum
CTL
CGL
High voltage unit
Main corona unit
Screen grid
Aluminum
layer
layer
OPC drum
OPC drum
CGL
CTL
CTL
Laser beams
MX-7040N OPERATIONAL DESCRIPTIONS 13 – 28
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.
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.
CGL, positive and negative charges are generated.
Positive charges generated on the CGL are attracted by the
negative charges on the OPC drum surface. On the other
hand, negative charges are attracted by the positive charges in
the aluminum layer of the OPC drum.
negative charges on the OPC drum surface. On the other
hand, negative charges are attracted by the positive charges in
the aluminum 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.
the OPC drum surface and in the aluminum layer, reducing
positive and negative charged to decrease the surface voltage
of the OPC drum.
CGL
CGL
Aluminum
layer
layer
Aluminum
layer
layer
CTL
CTL
Lens
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