Sharp AR-810 (serv.man7) Service Manual ▷ View online
AR-651/810 COPY PROCESS 3 - 9
(9) Discharging
Discharging is a process of eliminating any (–)
charge remaining on the OPC drum before the next
charging process begins.
If discharging does not occur, the following
phenomenon could occur:
The (–) charge remains on the photoconductive
drum.
Uneven charge is applied to the drum during the
next copy.
훹
The next copy has a double image. (Preceding image
appears.)
Solution :
Expose the entire surface of the OPC drum to the
light by the discharge LED array.
훹
The OPC drum becomes electrically discharged.
훹
All the (–) charges remaining on the OPC drum are
conducted to the ground.
훹
The preparation for the next copy is completed.
Dischage LED array
Drum
훹
AR-651/810 COPY PROCESS 3 - 10
3. 3. Comparison of Copy Process to AR-650/800
Process
1. Photoconductive drum
(1) Sensitivity
(2) Surface potential
2. Charging
3. Surface potential controlling
4. Writing
(1) Light source
Semiconductor laser (adjustment
Same as AR-650/800
not required)
(2) Light amount
4.0 nJ/mm
2
3.8nJ/mm
2
5. Image density control
Image quality sensor
Same as AR-650/800
6. Development
(1) Magnetic roller
(1) Magnetic roller
Two magnetic rollers
Same as AR-650/800
(2) Auto-toner
Magnetic bridge-circuit method
Same as AR-650/800
(3) Toner supply
Toner hopper system
Toner cartridge system
(There is a toner recycle system.)
(4) Toner-empty detection
Density detection method/lever joint
Density detection system
use
(5) Toner
T-6570/6570E
T-6510/6510E/6510D
(6) Developer material
D-6570J
D-6510
(7) Developer bias
DC-400V + AC
DC-500V + AC
7. Transfer
(1) Transfer
Transfer belt
Transfer belt
(Electrical resistance is lower than
AR-650/800.)
(2) Power supply roller
Power supply roller
Power supply roller
Separation auxiliary roller
Separation auxiliary roller
8. Separation
Transfer belt charging
Same as AR-650/800
Separation finger applied
Same as AR-650/800
9. Discharging
(1) Discharging position
Discharge by exposure after cleaning Same as AR-650/800
(2) Discharge lamp
Discharge by red LED
Same as AR-650/800
(3) Pre-cleaning discharge
None
Same as AR-650/800
10. Cleaning
(1) System
Blade + Brush
Same as AR-650/800
(2) Recovered toner
Not acceptable
Reuse (by the toner recycle system)
11. Cleaning brush bias
Earth
Varistor 430V
AR-650/800
AR-651/810
OD-6570 (OPC drum)
OD-6510 (OPC drum)
Highly sensitized drum
Same as AR-650/800
–650 V (grid voltage –720V)
–700 V (grid voltage –733V)
Scorotron method (constant current)
Same as AR-650/800
Grid output variable
Same as AR-650/800
None
Surface potential sensor
AR-651/810 COPY PROCESS 3 - 11
Process
AR-650/800
AR-651/810
12. Fusing
(1) System
Same as AR-650/800
· Fuser roller:
· Fuser roller:
Fluoroplastic-coated roller (ø60)
Fluoroplastic-coated roller (ø60)
· Pressure roller:
· Pressure roller:
PFA tube roller (ø60)
PFA tube roller (ø60)
(2) Cleaning
· Fuser roller cleaning roller (ø33)
· Cleaning web (for fuser roller cleaning)
· Cleaning felt roller (ø27)
· Pressure roller cleaning felt roller (ø28) · Pressure roller cleaning felt roller
· Cleaning metal roller
· Pressure roller cleaning metal roller
(3) Heater
(Lamp rating: 800W + 300W)
ON/OFF control by thermistor
Same as AR-650/800
AR-651/810 COPY PROCESS 3 - 11
Process
AR-650/800
AR-651/810
12. Fusing
(1) System
Same as AR-650/800
· Fuser roller:
· Fuser roller:
Fluoroplastic-coated roller (ø60)
Fluoroplastic-coated roller (ø60)
· Pressure roller:
· Pressure roller:
PFA tube roller (ø60)
PFA tube roller (ø60)
(2) Cleaning
· Fuser roller cleaning roller (ø33)
· Cleaning web (for fuser roller cleaning)
· Cleaning felt roller (ø27)
· Pressure roller cleaning felt roller (ø28) · Pressure roller cleaning felt roller
· Cleaning metal roller
· Pressure roller cleaning metal roller
(3) Heater
(Lamp rating: 800W + 300W)
ON/OFF control by thermistor
Same as AR-650/800
