Copy Process; General Description - Toshiba e-STUDIO555 Service Manual

3.

COPY PROCESS

3.1

General Description

Discharging
(1) Charging:
Negatively charges the surface of the
photoconductive drum.
↓
(2) Original exposure:
Converts images on the original into optical
signals.
↓
(3) Scanning:
Converts image optical signals into
electrical signals.
↓
(4) Writing:
Converts image electrical signals into
optical signals (laser emission) and
exposes them to the surface of the
photoconductive drum.
↓
(5) Development:
Makes the negatively-charged toner
adhere to the photoconductive drum and
forms a visible image.
↓
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( 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
700~1450W ( 6 )
Fig. 3-1
(6) Transfer:
(7) Fusing:
(8) Brush cleaning:
(9) Blade cleaning:
(10)Discharging:
3 - 1
Image processing
( 4 )
Writing
Semiconductive laser
( 555/655 )
Pw=3.9 nJ/mm 2
2 (755/855)
Pw=3.0 nJ/mm
Toner
Carrier
( 5 )
Development
Magnetic roller
Bias
-394V ( -200~-800 ) DC+AC
Bypass feeding
Drawer feeding
Transfer/Separation
LCF feeding
70 µA (555/655/755)
85 µA (855)
Cleaning brush + Blade
5 µA
Transfers the visible image on the
photoconductive drum onto paper.
Separation:
Separates the paper from the drum
together with the toner.
↓
Fuses the toner onto the paper by applying
heat and pressure.
↓
Cleans dirt and paper dust on the drum.
↓
Forcibly removes the residual toner on the
drum.
↓
Discharges any remaining negative charge
on the drum.
e-STUDIO555/655/755/855
COPY PROCESS
3