Sharp AR-C150 (serv.man5) Service Manual ▷ View online
(3) Operation of the transfer section (transfer)
a. Outline
This section transfers toner images formed on the OPC drum to the paper.
IMAGE TRANSFER(Y)
CLEANING
DISCHARGE(Y)
IMAGE TRANSFER BELT
TRANSFER
ROLLER(Y)
CLEANING BLADE
WASTE TONER
BOTTLE
DISCHARGE(M)
TRANSFER
ROLLER(M)
IMAGE TRANSFER(C)
DISCHARGE(C)
TRANSFER
ROLLER(C)
IMAGE TRANSFER(K)
DISCHARGE(K)
TRANSFER
ROLLER(K)
TRANSFER BELT
MOTOR
2
2
2
2
TRANSFER UNIT
LIFT MOTOR
IMAGE TRANSFER(M)
DISCHARGE(M)
TRANSFER
ROLLER(M)
ROLLER(M)
PCU
SUB
PWB
CNE
(12pin)
CNA
(34pin)
CNB
(8pin)
CNC
(7pin)
TRANSPORT BELT SECTION
BLUM
BLUD
BPSS
BPSS
HUD
PPD1
PSM
HVu(TC)
WTD
TO
PROCESS
SECTION
CALS
PCS
PCU
PWB
PCU
SUB
PWB
PROCESS SECTION
CN111
(34pin)
CN104
(28pin)
CN401
(6pin)
CN111
(34pin)
CN104
(28pin)
CNB
(8pin)
CN702
(40pin)
DCPS
HV PWB
(TC)
BELT UNIT
HV PWB
(MC)
TC K
MC HOLDER UNIT
MC
PWB
MC K
TC C
TC M
TC M
TC Y
OZFM
LSUFM
VFM
TFD
WASTE TONER UNIT
VENTILATION
FAN DUCT UNIT
GB K
DV Bias K
MC C
GB C
GB C
DV Bias C
MC M
GB M
GB M
DV Bias M
MC Y
GB Y
GB Y
DV Bias Y
AR-C150
2 – 27
b. Major parts functions and operations
No.
Parts
Note
Code
Signal
name
Name
Type
Function/Operation
Active
condition
1
Transfer unit
Transfers toner from the OPC
drum to paper.
drum to paper.
2
Transfer belt
separation pawl
separation pawl
Separates paper from the
transfer belt mechanically.
transfer belt mechanically.
3
BPSS
BPSS
Separation pawl
solenoid
solenoid
Drives the separation solenoid.
4
Transfer belt drive
roller
roller
Drives the transfer belt.
5
Transfer discharge
electrode
electrode
Discharges electric charges of
the transfer belt.
the transfer belt.
4 pcs (Y, M, C, K)
6
Transfer roller
Applies a transfer voltage to
the transfer belt.
the transfer belt.
4 pcs (Y, M, C, K)
7
Lift cam
Transmits the transfer belt lift
motor power to the transfer
unit.
motor power to the transfer
unit.
Lifted up in color print mode,
and lifted down in
monochrome mode.
and lifted down in
monochrome mode.
8
PCS
PCS
Image density
sensor
sensor
Photo sensor
(Photo reflection)
(Photo reflection)
Detects toner patch density in
image density correction.
image density correction.
Analog input
9
BLUM
BLUM
Transfer belt motor
Stepping motor
Lifts the transfer belt unit.
10 CALS
CALS
Sensor switch
solenoid
solenoid
Selects the image density
sensor.
sensor.
Switches the sensor angle
depending on detection of
color toner patch density or
black toner patch density.
depending on detection of
color toner patch density or
black toner patch density.
11
TC high voltage
power PWB
power PWB
Generates the high voltage for
transfer.
transfer.
12
Transfer belt
Transfers toner images on the
OPC drum onto paper.
OPC drum onto paper.
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
18
19
20
13
21
22
13
14
16
10
8
12
15
5
6
4
3
2
17
7
5
5
5
6
6
6
23
24
25
26
27
AR-C150
2 – 28
No.
Parts
Note
Code
Signal
name
Name
Type
Function/Operation
Active
condition
13
Waste toner tank
Collects toner of toner patch
used in image density
correction.
used in image density
correction.
14
Transfer belt
cleaning blade
cleaning blade
Cleans toner of toner patch
used in image density
correction.
used in image density
correction.
15
Transfer belt idle
roller
roller
Applies a tension to the
transfer belt.
transfer belt.
16
Transfer belt
cleaning pad
cleaning pad
Cleans the back of the transfer
belt.
belt.
17 BLUD
BLUD
Transfer belt
position sensor
position sensor
Photo sensor
(Photo
transmission)
(Photo
transmission)
Detects that the transfer belt is
lifted up or down.
lifted up or down.
L when lifting
up H when
lifting down
up H when
lifting down
18 BTM
BTM
Transfer belt drive
motor
motor
Stepping motor
Drives the transfer belt.
19 PSM
PSM
Resist roller drive
motor
motor
Stepping motor
Drives the resist roller and
controls ON/OFF.
controls ON/OFF.
20 HUD
HUD
Temperature sensor
Detects humidity in the
machine.
machine.
Analog input
Each correction of image
process section is made
according to this sensor data.
process section is made
according to this sensor data.
21
PCU sub PWB
Controls the image process
section.
section.
22
Oil pump
Supplies fusing oil to the fusing
roller.
roller.
23 PPD1
PPD1
Paper detector in
front of resist roller
front of resist roller
Photo sensor
(Photo
transmission)
(Photo
transmission)
Detects paper in front of the
resist roller.
resist roller.
L with paper
presence
presence
This detector signal serves
as the paper transport timing
control signal to the transfer
section.
as the paper transport timing
control signal to the transfer
section.
24
Upper resist roller
Transports paper to the
transfer section.
transfer section.
25
Lower resist roller
Transports paper to the
transfer section.
transfer section.
The operation timing is
controlled by the resist roller
motor.
controlled by the resist roller
motor.
26 BELTCH1 BELTCH1 Transfer belt
installation
detection switch
(+24V)
detection switch
(+24V)
Micro switch
Turns ON/OFF the +24V
power line from the DC main
power PWB to the PCU PWB.
power line from the DC main
power PWB to the PCU PWB.
ON when the
transfer unit
operation is
allowed.
transfer unit
operation is
allowed.
27 BELTCH2 BELTCH2 Transfer belt
installation
detection switch
(+5V)
detection switch
(+5V)
Micro switch
Turns ON/OFF the +5V power
line from the DC main power
PWB to the PCU PWB.
line from the DC main power
PWB to the PCU PWB.
ON when the
transfer unit
operation is
allowed.
transfer unit
operation is
allowed.
c. Details of operation
<1> Image transfer
A high positive voltage is applied to the transfer roller to positively
charge the transfer belt and the paper on it, attracting negatively
charged toner images on the OPC drum to the paper.
charge the transfer belt and the paper on it, attracting negatively
charged toner images on the OPC drum to the paper.
<2> Lifting
Since all the color toner images must be transferred in color printing,
all the OPC drums (Y/M/C/K) must be in close contact with the trans-
fer belt. Therefore, the transfer unit performs transfer operation in the
lift up position.
all the OPC drums (Y/M/C/K) must be in close contact with the trans-
fer belt. Therefore, the transfer unit performs transfer operation in the
lift up position.
While in monochrome print, there is no need to transfer Y/M/C toner
images, and the Y/M/C OPC drums are separated from the transfer
belt. Therefore, the transfer unit performs transfer in the loft down po-
sition. Lifting is performed by the lift motor and the lift cam.
images, and the Y/M/C OPC drums are separated from the transfer
belt. Therefore, the transfer unit performs transfer in the loft down po-
sition. Lifting is performed by the lift motor and the lift cam.
In the above operation, the transfer unit position is detected by the
transfer unit sensor.
transfer unit sensor.
AR-C150
2 – 29
<3> Transfer belt discharge
After completion of one cycle of transfer operation, the potential of the
transfer belt is reduced by the discharge electrode to make the next
cycle of transfer operation. (Initializing)
transfer belt is reduced by the discharge electrode to make the next
cycle of transfer operation. (Initializing)
<4> Separation
The paper passed through the transfer section is separated from the
transfer belt mechanically. The separation pawl is driven by the sepa-
ration solenoid.
transfer belt mechanically. The separation pawl is driven by the sepa-
ration solenoid.
<5> Cleaning
The transfer belt is cleaned by the transfer belt cleaning blade.
<6> Others
∗
The transfer belt is driven by the transfer motor.
∗
The high voltage for transfer is generated by the high voltage PWB
(TC).
(TC).
∗
The transfer voltage is varied depending on the paper kind,
temperature and humidity to perform constant transfer operation.
temperature and humidity to perform constant transfer operation.
∗
The transfer unit is provided with the humidity sensor, and the
sensor detection result is reflected on the correction operation of
the image forming section.
sensor detection result is reflected on the correction operation of
the image forming section.
∗
When the lock lever of the transfer unit is released, the micro
switch is turned off to cut the power line to the transfer unit.
switch is turned off to cut the power line to the transfer unit.
∗
The image density sensor is used to detect the toner patch density
on the transfer belt during correction of the image forming section.
on the transfer belt during correction of the image forming section.
(4) Operation of the toner hopper section (toner supply)
Lift cam
Lift cam
Lift sensor
Lift motor
Lift sensor
AR-C150
2 – 30
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