General Description Of Copying Process - Toshiba e-STUDIO281c Service Manual

3.2

General Description of Copying Process

2
Original exposure
Xenon lamp
16 W
5-2
Color development
Magnetic roller bias
- 400V (- 100 to -900V ) DC
1.0 kV/10kHz AC
3
Data reading (scanning)
CCD
600dpi, 7450 pixels
Image processing
(1) Charging: Places a negative charge on the
surface of the photoconductive drum.
(2) Original exposure: Converts images on the
original into optical signals.
(3) Data reading: The optical image signals are
read into CCD and converted into electrical
signals.
(4) Data writing: The electrical image signals
are changed to light signals (by laser emis-
sion) which expose the surface of the photo-
conductive drum.
(5) Development: Negatively-charged toner is
made to adhere to the photoconductive
drum, producing a visible image.
e-STUDIO281c/351c/451c COPY PROCESS
6
1st transfer
1800V ( 400 to 4000V )
Photocon-
ductive drum
Toner
Carrier
5-1
Black development
Magnetic roller bias
- 400V (- 100 to -900V ) DC
1.2 kV/10kHz AC
Fig.3-3
9
Cleaning
-1000 V
10
Discharging ( LED array )
Wavelength 660nm x 14pcs.
1
Charger (grid voltage)
-600V ( -300 to -1200V )
4
Data writing
Semiconductor laser
Pw=4.0 nJ/mm
2
(6) 1st transfer: Transfers the visible image
(toner) on photoconductive drum to the
transfer belt.
(7) 2nd transfer: Transfers the visible image
(toner) on the transfer belt to paper.
(8) Fusing: Fuses the toner image to the paper
by applying heat and pressure.
(9) Blade cleaning: While scraping off the resid-
ual toner from the drum by the blade, this
blade also eliminates the (+) residual charge
on the drum left after image transfer.
(10) Discharging: Eliminates the residual (–)
charge from the surface of the photocon-
ductive drum.
3 - 2
Paper exit
8
Fusing
IH coil
700 to 1300 W
7
2nd transfer
( + ) 1000V ( 500 to 4800V )
(-)- 1000V ( -100 to –2000V )
Bypass feeding
Drawer feeding
PFP/LCF feeding
June 2005 © TOSHIBA TEC