MX-M850 (serv.man19). Details of Each Section - H Image Process Section — Sharp Copying Equipment Service Manual (repair manual)

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MX-M850 (serv.man19)
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Service Manual
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Device
Copying Equipment / Details of Each Section - H Image Process Section
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mx-m850-sm19.pdf
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View Sharp MX-M850 (serv.man19) Service Manual online

MX-M1100  IMAGE PROCESS SECTION  H – 1
MX-M1100
Service Manual
 
[H] IMAGE PROCESS SECTION
1. Image process section operations 
A. General
The optical dot image outputted from the LSU is converted into a visible toner image and transferred onto paper. 
The image process section is composed of multiple sections and is controlled by the PCU PWB. 
There are three models available in this series. Each model has a different process speed with a different print speed.  
B. Process section composition
Model
Process speed
85-sheet machine
400mm/sec
95-sheet machine
540mm/sec
110-sheet machine
540mm/sec
Section name
General of operations
Charge section 
This section charges the OPC drum surface negatively with the main charger. 
Exposure section
This section radiates laser beams onto the negatively charged OPC drum surface to form an electrostatic latent 
image. 
Developing section
This section attaches toner to the electrostatic latent image generated in the exposure section, converting the 
image into a visible one. 
Toner bottle section 
This section supplies toner to the hopper. 
Toner hopper section 
This section supplies toner to the developing section. 
Pre-transfer discharge section
This section radiates light onto the OPC drum after development to discharge negative electric charges on the 
OPC drum, improving the transfer efficiency and the separation performance. 
Transfer section
This section applies a high positive voltage to paper to transfer the toner image on the OPC drum onto paper. 
Separation section 
This section separates paper from the OPC drum mechanically by the separation pawl when paper is not 
separated from the OPC drum naturally. 
Photoconductor cleaning section
This section removes residual toner from the OPC drum surface by the cleaning blade after transfer operation.
Charge section
Exposure section
Developing section
Toner bottle section
Toner hopper section
Pre-transfer
discharge section
Transfer section
Discharge section
Process
control
device
Surface potential sensor
Temperature
humidity sensor
Toner density sensor
Toner sensor
CRUM
Photoconductor
cleaning
section
Waste toner
transport
collect section
Image density sensor
Waste toner
transport collect
section
Separation section
MX-M1100  IMAGE PROCESS SECTION  H – 2
C. Image process section major parts
Discharge section 
This section radiates light onto the OPC drum by the discharge lamp to discharge the whole surface of the OPC 
drum, resetting the surface potential of the OPC drum to the initial level. 
Waste toner transport collect section 
This section cleans unnecessary residual toner from the OPC drum and transport it to the waste toner collection 
section. It cleans unnecessary residual toner in the transfer section and transports it to the waste toner collection 
section. 
Process control device
This section controls each voltage and the toner density control level and keeps them to the proper levels based 
on the outputs of the front surface potential sensor, the image density sensor, and the temperature/humidity 
sensor. 
Section name
General of operations
PCU
PWB
Transfer high voltage unit
Sub high voltage unit
THVCL
MHV
GB
Developing
mode
-500v
-500v
(85) (95/110)
+200v
+150v
-400v/-600v
Cleaning
mode
Cleaning
mode
Cleaning
mode for
transfer belt
Cleaning
mode for
cleaning roller
Transfer
mode
Transfer high voltage unit
THV
DVBS
DESS
DESS
HUS-CL/TH-CL
HUS-CL/TH-CL
PTDL
PTDL
DL
DL
TCS
TFSD
TFSD
CRUM
CRUM
PCS
PCS
30-40
μA
AC4.5kv
(p-p)
8
9
20
19
21
18
1
2 3
10
22
23
22
12
11
14
17
15
16
13
15
5
4
6
6
7
MX-M1100  IMAGE PROCESS SECTION  H – 3
No.
Name
Function / Operation
1
Main charger unit
Charges the OPC drum surface evenly and negatively by negative discharge.
2
OPC drum
Forms electrostatic latent images by laser beams, and converts them into toner images through the development 
operation. 
3
Laser beam
Forms electrostatic latent images on the OPC drum. Radiated from the LSU. 
4
Developer roller
Composes a magnetic brush with developer, and forms toner images on the OPC drum. 
5
Developing doctor
Controls the thickness and the quantity of developer and toner on the MG roller to the proper levels. 
6
Toner mixing roller 
(Developing section)
Mixes and circulates developer (carrier) and toner to uniformize the toner density and to charge toner negatively.
7
Toner supply roller 
Supplies toner from the toner hopper to the developing unit. 
8
Toner mixing roller 
(Toner hopper section) 
Mixes toner in the toner hopper.
9
Toner bottle
The toner bottle itself rotates to supply toner to the toner hopper unit. 
10
Transfer idle roller 
Applies a tension to the transfer belt.
11
Transfer belt
Transfers toner images from the OPC drum to paper. 
12
Transfer roller
Applies a voltage to transfer toner from the OPC drum to paper.
13
Transfer drive roller
Drives the transfer belt. 
14
Transfer tension roller
Applies a proper tension to the transfer belt. 
15
Transfer cleaning blush
Remove and clean unnecessary residual toner from the transfer belt after transfer. 
16
Transfer cleaning blade
Remove and clean unnecessary residual toner from the transfer belt after transfer. 
17
Waste toner transport screw 
(Transfer section)
Transports waste toner in the transfer unit to the waste toner collection section.
18
OPC drum separation pawl
Separates paper from the OPC drum. 
19
Photoconductor cleaning blade
Remove and clean unnecessary residual toner from the OPC drum. 
20
Photoconductor cleaning brush 
roller 
Remove and clean unnecessary residual toner from the OPC drum. 
21
Waste toner transport screw 
(Photoconductor cleaning section)
Transports waste toner in the transfer unit to the waste toner collection section.
22
Main high voltage PWB
Outputs the developing bias voltage, the main charger voltage, the transfer voltage, and the transfer cleaning 
voltage. 
23
Sub high voltage PWB
Outputs the transfer cleaning voltage. 
Code
Name
Function / Operation
Type
DESS
Surface potential sensor
Detects the drum surface potential after exposure or after non-exposure. 
Feed-back type surface 
potential sensor
TCS
Toner density sensor
Detects the toner density in the developing unit. The transmission-type magnetic 
sensor is employed. 
Magnetic sensor
HUS-CL /
TH -CL
Temperature humidity sensor
Detects the temperature and the humidity in the image process section. The detection 
result is reflected on the process control. 
Humidity sensor / 
Thermistor
TFSD
Toner sensor
Detects the toner remaining quantity in the toner hopper. The signal will be used in 
process control. 
Piezoelectric sensor
PTDL
Transfer front discharge lamp
Reduces the OPC drum potential before transfer to improve the transfer efficiency. 
LED
DL
Discharge lamp
Discharges the residual potential on the OPC drum by the lamp light. 
LED
PCS
Image density sensor
Detects the toner patch density on the OPC drum for the process control operation. 
Reflection type sensor
CRUM
CRUM chip
Saves various information of the toner bottle. 
Memory IC
MX-M1100  IMAGE PROCESS SECTION  H – 4
D. Image process section electric circuit diagram
-500v
-500v
(85) (95/110)
+200v
+150v
-400v/-600v
30-40
μA
AC4.5kv
(p-p)
PCU
PWB
Transfer high voltage unit
Sub high voltage unit
THVCL
MHV
GB
Developing
mode
Cleaning
mode
Cleaning
mode
Cleaning
mode for
transfer belt
Cleaning
mode for
cleaning roller
Transfer
mode
Transfer high voltage unit
THV
DVBS
DESS
DESS
HUS-CL/TH-CL
HUS-CL/TH-CL
PTDL
PTDL
DL
DL
TCS
TFSD
TFSD
CRUM
CRUM
PCS
PCS
MX-M1100  IMAGE PROCESS SECTION  H – 5
E. Image process section actual wiring diagram
1 DVBS
2
B2P-VH
DVBS
DSW-F-HV
B16B-PASK
DF1B-28DES-2.5RC
DF1B-28DEP-2.5RC
CN1
1
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
XTHV+PWM
7
19 XTHV+PWM 19
XTHV+REM
8
20 XTHV+REM 20
XTHV-PWM
9
21 XTHV-PWM 21
XTHV-REM 10
22 XTHV-REM
22
XTHVACPWM 11
23 XTHVACPWM 23
XTHVACREM 12
24 XTHVACREM 24
XDVPWM
13
25 XDVPWM
25
XDVREM
14
26 XDVREM
26
HVREMout
15
27 HVREMout
27
+24V_A
16
28 +24V_A
28
1 GB
2
B2P-VH
GB
9
B40B-PNDZS-1
CN-3
DSW-F-HV
11 GND2
13 GND2
15 XGBPWM
17 XMHVREM
19 MHV-T
21 XTHV+PWM
23 XTHV+REM
25 XTHV-PWM
27 XTHV-REM
29 XTHVACPWM
31 XTHVACREM
33 XDVPWM
35 XDVREM
37 HVREMout
39 +24V_A
THV
MHV
PCU
PWB
High voltage
PWB unit
(Main)
2 DSW-F-HV2
4 GND2
6 GND2
DSW-F-HV2
B11B-PASK
CN1
1
GND2
2
16 XTHVCLPWM
GND2
3
18 XTHVCLREM
XTHVCLPWM
8
22 XBHVREM
XTHVCLREM
9
XBHVREM
11
1
B2P-VH
THVCL
2 THVCL
High voltage
PWB unit
(Sub)

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