Sharp AL-840 (serv.man5) Service Manual ▷ View online
<3> Transfer, separation section
No.
Parts
Note
Name
Function/operation
1
Transfer roller
Transfers toner images on the OPC drum onto the paper.
2
Transfer roller
electrode
electrode
Connects the transfer roller and the transfer voltage output (high voltage PWB).
3
Pressure spring
Applies pressure to the transfer roller, paper, and the OPC drum to improve
transfer efficiency.
transfer efficiency.
4
Separation electrode
Reduces paper charging potential to facilitate separation of paper.
5
Earth electrode
Connects the separation electrode and the earth (high voltage PWB).
1)
3)
2)
5)
4)
1)
4)
3)
5 – 9
e. Fusing, paper exit section
No.
Parts
MODEL
Note
Code
Signal name
Name
Type
Function/operation
Active condition
1
Heat roller
Heats toner on the paper
and fuses onto the paper.
and fuses onto the paper.
LOW (0V) when
paper is
detected.
paper is
detected.
2
POUT
POUT IN
Paper exit detector
Photo transmission
sensor
sensor
Detects paper exit.
3
RTH IN
Fusing temperature
sensor
sensor
Thermistor
Detects the heat roller
surface temperature.
surface temperature.
4
Temperature fuse 1
(Fusing section)
(Fusing section)
Mold
Assures safety in
overheating.
overheating.
5
Temperature fuse 2
(Fusing section)
(Fusing section)
Mold
Assures safety in
overheating.
overheating.
6
HL
Heater lamp
Halogen lamp
Heats the heat roller.
100V series 10V 500W
120V series 120V 500W
200V series 230V 500W
7
Pressure roller
Applies a pressure to the
heat roller and paper to
improve fusing efficiency.
heat roller and paper to
improve fusing efficiency.
8
Paper exit roller
Discharges paper after
fusing.
fusing.
9
Separation pawl
Separates paper from
the fusing roller
mechanically.
the fusing roller
mechanically.
10
Paper exit roller
Discharges paper
outside the machine
after fusing.
outside the machine
after fusing.
11
Pressure spring
Applies a pressure to the
heat roller, paper, and
pressure roller to
improve transfer
efficiency.
heat roller, paper, and
pressure roller to
improve transfer
efficiency.
7)
8)
11)
9)
1)
9)
10)
5)
4)
3)
2) POUT
6)
7)
8)
11)
1)
11)
10)
9)
6)
3)
2) POUT
4)
5)
5 – 10
f. Drive section
No.
Parts
Note
Code
Signal name
Name
Type
Function/operation
1
MM
Main motor
Stepping motor
(+24V)
(+24V)
Drives the paper feed section, the paper
transport section, the fusing section, and
the image process section.
transport section, the fusing section, and
the image process section.
2
Paper feed section drive
gear
gear
Transmits the main motor power to the
paper feed section.
paper feed section.
3
Imaging process, fusing
section drive gear
section drive gear
Transmits the main motor power to the
imaging process section and the fusing
section.
imaging process section and the fusing
section.
g. Printer section
No.
Parts
MODEL
Note
Name
Type
Function/operation
1
ICU PWB
Converts print data sent from the host
into bit image.
into bit image.
Printer models only
2
Printer interface
connector
connector
IEEE1284 parallel interface
Connects with the host computer
(parallel interface)(IEEE1284)
(parallel interface)(IEEE1284)
Allows connection with two
host computer(s). Printer
models only
host computer(s). Printer
models only
2)
1)
3)
1)
2)
5 – 11
h. Cross sectional view
No.
Parts
Model
Note
Code
Signal name
Name
Type
Function/operation
Active condition
1
Fusing temperature
sensor
sensor
Thermistor
Detects the heat roller surface
temperature.
temperature.
Analog signal (2.0
∼
5.0V)
2
No. 3 mirror (LSU)
Leads the laser beam to the
OPC drum.
OPC drum.
3
No. 1 mirror (LSU)
4
No. 2 cylindrical lens
Corrects the laser beam
deflection caused by variations
in the surface angle of the
scanning mirror. Also prevents
agaist dirt in the optical section.
deflection caused by variations
in the surface angle of the
scanning mirror. Also prevents
agaist dirt in the optical section.
5
OPC drum
OPC
Forms latent electrostatic
images.
images.
6
Laser scanner
Scans laser beams to perform
imaging.
imaging.
7
frror (No. 2 mirror)
(LSU)
(LSU)
Corrects the laser beam form
and pitch.
and pitch.
8
Laser diode
Generates the laser beam.
(Controls ON/OFF for imaging.)
(Controls ON/OFF for imaging.)
9
PE SENSOR
PEMP IN
Paper empty
detector
detector
Photo
transmission
sensor
transmission
sensor
Detects paper on the paper tray.
LOW (0V) when
paper is detected.
paper is detected.
10
Paper pressure
spring
spring
Presses paper onto the paper
feed roller at a proper pressure.
feed roller at a proper pressure.
11
Paper pressure plate
Presses paper onto the paper
feed roller at a proper pressure.
feed roller at a proper pressure.
12
Paper feed roller
Feeds paper.
13
Paper separator
Separates paper in paper feed.
29)
35)
28) MHPS
30) SL SENSOR
31)
34)
32)
33) CCD SENSOR
1)
2)
3)
4)
5)
6)
7)
8)
9) PE SENSOR
10)
11)
12)
13)
14) PIN SENSOR
15)
16)
17)
22)
21)
23)
24) POUT
25)
26)
18)
36)
5 – 12
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