Copy Process; General Description - Toshiba e-STUDIO520 Service Manual

3.

COPY PROCESS

3.1

General Description

Discharging
(1) Charging:
Negatively charges the surface of the pho-
toconductive drum.
p
(2) Original exposure:
Converts images on the original into optical
signals.
p
(3) Scanning:
Converts image optical signals into electri-
cal signals.
p
(4) Writing:
Converts image electrical signals into opti-
cal signals (laser emission) and exposes
them to the surface of the photoconductive
drum.
p
(5) Development:
Makes the negatively-charged toner
adhere to the photoconductive drum and
forms a visible image.
p
March 2005 © TOSHIBA TEC
( 2 ) ( 3 )
Scanning
Original exposure
Xenon lamp CCD
29W 600 dpi,7500 pixel
( 1 ) Charging ( grid voltage )
-500V ( -300V~-900V )
( 10 )
Discharge
LED array
( Wavelength 660nm x14pcs )
( 9 )
Blade cleaning
( 8 )
Brush cleaning
( 7 )
Fusing
Fuser roller
Transfer/Separation
( 6 )
700~1450W
Cleaning brush + Blade
Fig.3-1
(6) Transfer:
(7) Fusing:
(8) Brush cleaning:
(9) Blade cleaning:
(10)Discharging:
3 - 1
Image processing
( 4 )
Writing
Semiconductive laser
2 ( 520/600/720 )
Pw=3.9 nJ/mm
( 850 )
Pw=3.0 nJ/mm 2
Toner
Carrier
( 5 )
Development
Magnetic roller
Bias
-394V ( -200~-800 ) DC+AC
Bypass feeding
Drawer feeding
LCF feeding
70 µA ( 520/600/720 )
85 µA ( 850 )
5 µA
Transfers the visible image on the photo-
conductive drum onto paper.
Separation:
Separates the paper from the drum
together with the toner.
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Fuses the toner onto the paper by applying
heat and pressure.
p
Cleans dirt and paper dust on the drum.
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Forcibly removes the residual toner on the
drum.
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Discharges any remaining negative charge
on the drum.
e-STUDIO520/600/720/850 COPY PROCESS
3