Sharp Mx 2300n Service Manual

							MX-2300/2700 N/G  DUPLEX SECTION  G – 5 k. Transport roller 10 (Drive)
l. Transport roller 11 (Drive)
1) Open the right door unit.
2) Remove the connector cover ADU inner cover.
3) Remove the ADU cabinet F and the ADU cabinet R.
4) Remove the reverse PG unit.
5) Remove the upper transport fulcrum holder, and remove the
ADU open/close door.
6) Remove each parts, and remove the trasnport roller 10 (drive)
(A) and the trasnport roller 11 (drive) (B).
m. ADU transport path detection 2
1) Open the right door unit.
2) Remove the right door transport PG, the follower pressure
plate, and the ADU waste toner cover.3) Remove the ADU trasnsport path detector 2.
1
1
2A
B 
						

							MX-2300/2700 N/G  DUPLEX SECTION  G – 6
4. Maintenance
✕: Check (Clean, replace, or adjust according to necessity.) {: Clean ▲: Replace U: Adjust ✩: Lubricate †: Shif the position.
No. Parts nameMonochrome 
supply, 
mechanical 
partsWhen 
calling100
K200
K300
K400
K500
K600
K700
K800
K900
K1000
K11 0 0
K1200
KRemark/Refer to 
the Parts Guide. 
Block/Item No. 
(Only the 
replacement parts 
are described.)
1 Transport rollers Mechanism parts{ {{{{{{{{{ { { {
2 Discharge brush✕ ✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕
3Gears✕ ✕✕✕✕✕✕✕✕✕ ✕ ✕ ✕When checking, 
apply to the 
necessary positions. 
(Specified positions)
2
2
1 
						

							MX-2300/2700 N/G  LSU SECTION  H – 1 MX2700N
Service Manual [H] LSU SECTION
1. Electrical and mechanism relation diagram
CN11 B7P-PH-K-SCN8 CN21
B4P-PH-K-R
S6B-XA B6B-XA
CN2 B12B-PHDSS-BCN7 CN13
CN1 B34B-PHDSS-B
S20B-PHDSS-B B20B-PHDSS-B
CN9 CN14
S22B-PHDSS-B B22B-PHDSS-B
CN4 B6P-PH-K-S PSM2P RCN10
B5P-PH-K-S 1
4
/LSUSS_B24V3
2
19
20
21
22 124V31
2
D-GND
ECLK_LSU_P
ECLK_LSU_N17 /LSUSS_B
21
22 20 15
17
18
194
105
1611
12
13
14
15
16VSYNC_Y_N 1
20
3CH0_N
CH0_P
D-GND 19
1
2
14 13 D-GND CH0_N
D-GND
D-GND
CLCLK_PCH2_P
CH3_P CH3_N
D-GND
ECLK_LSU_P
ECLK_LSU_ND-GND
D-GNDHSYNC_LSU_P HSYNC_LSU_ND-GNDVSYNC_K_P VSYNC_K_N
VSYNC_C_P
VSYNC_C_N
6D-GND
3.3V
D-GND
5VN
24V1
P-GND 1
2
3
4
24V1 55
P-GND 6 D-GND 3
5VN 4 D-GND 1
3.3V 2
129 2
3
4
LSU PWB
10
11 D-GND
CLCLK_NCH2_N20 19
CH1_N
CH1_P
9 5
6
7
86
7
8
CLCLK_P
CH3_N
CH3_P
D-GNDCH2_P
D-GND
D-GND
CLCLK_ND-GND
CH1_N
CH1_P
CH2_N CH0_P16
17
18
1
VSYNC_M_N
VSYNC_Y_P VSYNC_M_P
VSYNC_Y_N
15
16
17
18 11
12
13
14VSYNC_M_N
VSYNC_M_PVSYNC_Y_P 2
3
4
5
6
7
8VSYNC_K_N
VSYNC_K_P
VSYNC_C_P
VSYNC_C_Nn TRANS_DATAD-GNDLSUASIC_RSTn RSV_DATJOBEND_INTLSUTH1
LSUTH2 8
9
10
11n TRANS_RST9
10 4
13
14
15 125
6
7
LSUTH2 nRSV_DAT
n TRANS_RSTJOBEND_INTLSUTH1 nSCK_LSUn TRANS_DATAD-GNDLSUASIC_RSTINT5V
D-GND
D-GND
D-GND1
2
3D-GND
n SCK_LSUINT5V
D-GND 6
5
11
12LSUTH1
D-GND
LSUTH2
1 6
/START
P-GND
24V1 /BREAK LDCHK_Y
nLDERR_Y
4
2 /START
P-GND
5
3POLYCLK
/LOCK D-GND
Vref_Y
24V1 /BREAK
6 1
POLYCLK
/LOCK2
3
4
5 3
4 LSUTH1
D-GND
/SH_Y
/ENB_Y
DT_Y-
DT_Y+
LDCHK_M
n LDERR_MD-GND
INT5V
DT_M-
DT_M+
D-GND
Vref_M D-GND
INT5V
/SH_M
/ENB_M
D-GND
Vref_C
LDCHK_C
n LDERR_C/SH_C
/ENB_C
DT_C-
DT_C+ 26
32
34
33 29
31
30
28
22
21 27
25
18
16
14
20 15
13
17
19
2
8
10
9 5
7
6
4 4
3
2
1 8
7
6
5
D-GND
Vref_Y
LDCHK_Y
n LDERR_Y/SH_Y
/ENB_Y
DT_Y-
DT_Y+10
9
LDCHK_M
n LDERR_M2
1 D-GND
INT5V
10
9
8
7
6
5
4
3 DT_M-
DT_M+
D-GND
Vref_M D-GND
INT5V
/SH_M
/ENB_M
4
3
2
1 8
7
6
5
D-GND
Vref_C
LDCHK_C
n LDERR_C/SH_C
/ENB_C
DT_C-
DT_C+
SK_K
n LDERR_K D-GND
INT5V10
93
1D-GND
INT5V
10
9D-GND
INT5V
/SH_K
/ENB_K
DT_K-
DT_K+
D-GND
Vref_K
2
13
1
5
7
6
4
2
8
SK_K
n LDERR_K10
9
8
7
6
5
4
3 DT_K-
DT_K+
D-GND
Vref_K D-GND
INT5V
/SH_K
/ENB_K5VN
D-GND
nBD
D-GND 4
3
2
1 1
2
3
4 5VN
D-GND
nBD
D-GND
MOTHER PWB
PCU PWB
D-GND
18HSYNC_LSU_N
HSYNC_LSU_PD-GND
PGM
1
LSUSS
2
3
467 5
14
89 11
1312
9
10
10
10
10
9 
						

							MX-2300/2700 N/G  LSU SECTION  H – 2
2. Operational descriptions
A. LSU section
(1) Outline
Image data sent from the image process circuit through the mother
are converted into laser beams to be radiated onto the OPC drum
surface. The LSU unit is composed of the primary system including
optical elements such as lasers and the polygon mirror and the mir-
ror which assures the optical path and the scan system which
includes the optical elements including the polygon mirror and the
mirror which assures the optical path. 
(2) Composition
(Primary system)(Scan system)
(On the polygon mirror)
(3) Outline of LSU specifications
Signal name Name Function/Operation
PGM Polygon motor Laser beam is reflected at the constant speed rotation.
No. Name Function/Operation
1 LD PWB (K) Controls laser beam flashing and the output value.
2 LD PWB (C)
3 LD PWB (M)
4 LD PWB (Y)
5 Cylindrical lens Converges laser beams and focus. 
6fθ lens 1 Laser beams are refracted so that the laser scan speed on the OPC drum is even in both ends and at the center.
7fθ lens 2
8 Reflection mirror Secures the path for laser beams.
9 Cylindrical lens Converges laser beams, and focus on the OPC drum.
10 OPC drum Forms electrostatic latent images according to laser beams.
11 Convergence lens for BD Converges laser beams to the BD PWB.
12 BD PWB Detects the timing for starting laser scanning.
13 LSU CNT PWB Laser beams are controlled and the polygon motor control signal is generated according to the PCU PWB control 
signal and image data. 
14 LSU therminstor Measures the temperature in LSU.
ModelNumber of 
mirror 
surfacesRotating 
speedBearing Remark
MX-2700N/G 7 surfaces 25106rpm OIL
Effective scan width: 307mm
Resolution: 600dpi
Beam diameter: Main scan = 50 to 65µm,  Sub scan =  60 to 75µm
Laser power: Max. 0.65mW
LD wavelength: 770 to 795nm 
						

							MX-2300/2700 N/G  LSU SECTION  H – 3
3. Disassembly and assembly
A. LSU section
(1) LSU
1) Remove the left cabinet rear lower and the left cabinet. (Refer
to Left Cabinet Rear Lower and Left Cabinet in External Outfit
Section.)
2) Remove the waste toner box.
3) Remove the LSU left plate PA.4) Remove the LSU slant adjustment  plate screw (A), and loosen
the screw (B). 
Remove the LSU shaft fixing plate. Remove the screws.
5) Shift the front side of the LSU shaft from (A) to (B), and remove
the LSU shaft.
6) Disconnect the connector, and remove the LSU.
a. Dust-proof glass
1) Remove the waste toner box.
2) Remove the LSU cleaning stick from the front cover.
Unit Parts Maintenance
(1) LSU a Dust-proof glass{
b Polygon motor
(2) Others a LSU shutter solenoid
b Cleaning base{▲
(1)
(1)-b(2)-a
(2)-b
(1)-a
1
2
1
2
1
2
A
B
B
A
2
3
1 
						

							MX-2300/2700 N/G  LSU SECTION  H – 4 3) Insert the LSU cleaning rod and slide it back and forth a few
times to clean the dust-proof glass.
b. Polygon motor
1) Remove the LSU.
2) Remove the screws, and remove the LSU CNT PWB cover R.
3) Remove the screws, then lift up the LSU CNT PWB cover F
(A).
Remove the screws, and lift up the polygon motor unit (B).4) Remove the connector and the screws, then remove the poly-
gon motor.
* When installing, do not touch the moving section of the poly-
gon mirror and the mirror surface.
(2) Others
a. LSU shutter solenoid 1
1) Remove the LSU.
2) Remove the connector and the screws, then remove the LSU
shutter solenoid unit.
* When installing, the shutter U-groove is engaged with the
shutter lever arm shaft section (A). 
3) Remove the screws, and remove the LSU shutter solenoid 1.
* When installing, engage the solenoid pin with the shutter
lever arm. 
A
B1
2
A 
						

							MX-2300/2700 N/G  LSU SECTION  H – 5 b. Cleaning base
1) Remove the waste toner box.
2) Remove the LSU cleaning stick from the front cover.
3) Remove the cleaning base from the LSU cleaning rod. 
4. Maintenance
A. LSU section
✕: Check (Clean, replace, or adjust according to necessity.) {: Clean ▲: Replace U: Adjust ✩: Lubricate †: Shif the position.
No. Parts nameMonochrome 
supply, 
mechanical 
partsWhen 
calling100
K200
K300
K400
K500
K600
K700
K800
K900
K1000
K11 0 0
K1200
KRemark/Refer to the 
Parts Guide. Block/
Item No. (Only the 
replacement parts are 
described.)
1 Dust-proof glass Mechanism 
parts{ {{{{{{{{{ { { {
2 Cleaning base✕ ▲▲▲▲▲▲▲▲▲ ▲ ▲ ▲(P/G No.: [2]-35)
1
2 
						

							MX-2300/2700 N/G  PHOTOCONDUCTOR SECTION  i – 1 MX2700N
Service Manual [i] PHOTOCONDUCTOR SECTION
1. Electrical and mechanism relation diagram
CN9B3P-PH-K-S
AC
PWBCN1
MC-K GB-KGB-C
B6P-PH-K-SCN26 CN2
1TC_CL 3
GB-MHV_REM 7
MC_YMC 6
1TC_K 5
B32B-PHDSS-B 1TC_YMC 4
GB-YP-GND 2
INT24V2 1
B7P-PH-K-S MC-CMYCN1
INT24V2
7
P-GND 6
1TC_YMC 4
1TC_K 3
MC_YMC 2
HV_REM 1
1TC_CL
5
B7P-PH-K-S
1 INT24V2HV_REM#6
5
4
3
2
1 /HV_DATA#
/HV_CLK#
/HV_LD1#INT24V2
P-GND
/HV_CLK#
/HV_LD1#
HV_REM# 20
21
22
23
24
MC PWB 1st TC PWB
P-GND
/HV_DATA#
DL_BKPHNR-10-H,BU10P-TR-P-H
CN15
53254-0310 DL_C
PHNR-10-H,BU10P-TR-P-H
53254-0310 DL_M
PHNR-10-H,BU10P-TR-P-H
53254-0310 DL_Y
PHNR-10-H,BU10P-TR-P-H
53254-0310
B40B-PADSS-B
9 D-GND 2
9 D-GND 2
DL_M#
D-GND 2
DL_BK# 310 19D-GND
D-GND D-GND D-GND
DL_C#
10 39 1
DL_BK# D-GNDDL_Y# 1
DL_Y# 3
10
DL_C#1
3
1 2
DL_BK# 1DL_C# 21
1D-GND
DL_M# 2 24 D-GND
DL_Y# D-GND
22
14
DL_M# 3
10
1
PCU PWB
23 D-GND
RSM6PCN1
B12B-PH-K-S
DRIVER
SUB PWB
6
8
7 INT24V1
10 4
12 INT24V19
11 INT24V13
DMCLA/ 4
1 6 INT24V1
DMCLB/ DMCLB// DMCLB// 1
3
DMBKA// 55
2 INT24V1 INT24V1 2
3 4 6
1


DMBKA/
1 DMBKB/ DMBKB//DMBKA/
DMBKB//DMBKB/ DMBKA// DMCLA// INT24V1 5
DMCLA// 6INT24V1 5
2 DMCLA/ 4 DMCLB/ 3
2
DL_BK DL_C DL_M
MCGB
DMCL
DMBK
DL_Y
GB
GB
GB2 1 2
MC
MC
MC
1
1
1 
						

							MX-2300/2700 N/G  PHOTOCONDUCTOR SECTION  i – 2
2. Operational descriptions
A. OPC drum section
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.
1) The OPC drum surface is negatively charged by the main
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.
2) LED lights are radiated to the OPC drum surface by the laser
(writing) unit to form latent electrostatic images.
When LED 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. On the other hand,
negative charges are attracted to positive charges in the alumi-
num 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 LED 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.
Signal name Name Function/Operation
DMCL Drum motor (Color) Color photoconductor drive
DMBK Drum motor (Black) Black photoconductor drive
DL Discharge lamp (Y, M, C, BK) Light is passed to the discharge lens to drive the OPC drum surface.
MC Main charge (Y, M, C, K) The OPC drum surface is charged negatively.
GB Grid (Y, M, C, K) The OPC drum surface potential is controlled. 
No. Name Function/Operation
1 OPC drum (Y, M, C, K) Latent electrostatic images are formed. 
2 Cleaning blade Residual toner is cleaned and removed from the OPC drum surface.
Aluminum
layer
OPC drum
CTLCGL
High voltageunit
Main corona unit
Screen grid
LED lights
Aluminum
layerOPC drum
OPC drum
CGL
CTL 
						

							MX-2300/2700 N/G  PHOTOCONDUCTOR SECTION  i – 3 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.
3. Disassembly and assembly
A. Process drum unit
(1) Each color drum unit
1) Open the front cover.
Lens
CGLCGL
Aluminum
layerAluminum
layer
CTLCTL
Unit Parts Maintenance
(1) Drum unit a Drum▲
b Charging unit▲
c Side seal F, R✕
d Toner reception seal✕
e Cleaner blade▲
(2) Others a Waste toner drive motor
b Waste toner full detection switch
(1)-e(1)-a
(1)-d
(1)-c
(1)-b
(1)-c(1)
(2)-a (2)-b