Toshiba e-studio550 Service Manual page 45

3. COPY PROCESS
3. 1. General Description
2
10
LED array (wavelength 660nm x 16)
Blade cleaning
9
Fur brush cleaning
8
7
Discharging
Fuser roller
700~1450W
(1) Charging: Negatively charges the surface of the
photoconductive drum.
(2) Original exposure: Converts images 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.
JUNE 2002 © TOSHIBA TEC
Original exposure
Xenon lamp
29W
1
Charging
-733V (grid voltage)
Discharging
Fusing
mage processing
I
Scanning
3
CCD
600dpi, 7500pixel
– –
–
–
–
–
–
–
–
–
–
–
– –
+ + + +
Transfer/Separation
80µA
Cleaning brush + Blade
5µA
(6) Transfer: Transfers the visible image on the
photoconductive drum onto a paper.
Separation: Separates the paper from the drum
together with the toner.
(7) Fusing: Fuses the toner on the paper by applying
heat and pressure.
(8) Fur brush cleaning: Cleans dirt and paper dust
on the drum.
(9) Blade cleaning: Forcibly removes the residual
toner on the drum.
(10) Discharging: Discharges any remaining
negative charge on the drum.
3 - 1
Writing
4
Semiconductor laser
Pw=3.8nJ/mm
Toner
Carrier
–
– 5
Development
–
+
+ +
+
–
Magnetic roller
– +
+ +
–
+
Bias -500VDC+AC
–
–
Bypass feeding
Cassette feeding
6
LCF feeding
e-STUDIO550/650/810 COPY PROCESS
2