Copy Process; General Description Of Copying Process - Toshiba e-STUDIO350 Service Manual

3. COPY PROCESS

3.1 General Description of Copying Process

(2) Original exposure
Xenon lamp
16W
(3)
Data reading(scanning)
CCD
600 dpi,7400 pixel
Image processing
(4)
(1) Charging: Applies 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 signals are converted
into electrical signals.
(4) Data writing: The electrical signals are converted
into light signal (laser emission) which exposes the
surface of the photoconductive drum.
(5) Development: Negatively-charged toner adheres
to the photoconductive drum and forms visible
image.
November 2003 © TOSHIBA TEC
(11) Discharging
Discharge LED (red)
Wavelength 660nm x14pcs
(1) Charging
–790V
(grid voltage)
Data writing
Semiconductive laser
Pw=4.3 nJ/mm
2
(5)
Development
Magnetic roller
Bias –550VDC
+150VDC
Fig.3-101
(6) Transfer bias: Improves transfer efficiency.
(7) Transfer: Transfers the visible toner image on
(8) Separation: Separates paper with the toner
(9) Fusing: Fuses the toner image onto the pa-
(10) Cleaning : Scrapes off the residual toner from
(11) Discharging : Eliminates the residual nega-
3 - 1
Paper exit
(9)
Fusing
Induction heating (IH)method
700~1240W
(10)
Cleaning
Blade method
(8)
Separation
ACH
C
L
DC
1kHz
(7) Transfer
H 286 uA
C 286 uA
L 137 uA
Transfer bias
(6) DC+580V
Bypass feeding
Toner
(100 sheets)
Carrier Drawer feeding
(upper/lower)
(550 sheets)
PFP (upper/lower)
(550 sheets) or
LCF
(1250 sheets x 2)
the photoconductive drum onto paper.
image from the photoconductive drum.
per by applying heat and pressure.
the drum.
tive charge from the surface of the
photoconductive drum.
e-STUDIO350/450 COPY PROCESS
5.5kV
4.0kV
2.5kV
-100V
3