Toshiba 4580, Service Manual

Page: 49 / 379

Mar. 2000 © TOSHIBA TEC 3 - 1A 8070/6570/5570/4580 COPYING PROCESS
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3. COPYING PROCESS
3.1 Copying Process
6
Transfer/separation: Transfers the visible im-
age from the drum onto the transfer (copy)
sheet.
Simultaneously separates the transfer sheet
and toner from the drum.
7
Fixing: Fixes the toner on the transfer sheet by
applying heat and pressure.
8
Fur brush cleaning: Dirt and paper dust is
cleaned from the drum.
9
Cleaning: Mechanically removes any remain-
ing toner on the drum.
10
Discharger LED array: Discharges any remain-
ing – charge from the drum.
1
Charging: Negatively charges the surface of the
photosensitive drum.
2
Original exposure: Images are converted to
optical signals.
3
Scanning: Image optical signals are converted
to electrical signals.
4
Printing: Image electrical signals are converted
to optical signals (for laser emission) and ex-
posed on the photosensitive drum.
5
Development: – toner adheres to the surface
of the photosensitive drum and forms a visible
image.
–650V
Charger
Scanning
CCD
Separation/Transfer
50
µ
A
Cleaning brush + Blade
5
µ
A
Halogen lamp
Original exposure
180 W
Fixing
Heat roller
•
700 W x 1
•
600 W x 1
600 dpi, 7500-pixels
Discharger LED array
Wavelength 660 nm x 16
Blade cleaning
Paper exit
Development
Manual paper supply
(100 sheets)
PFP
(500 sheets each)
LCF
(4000 sheets)
Image processing
Toner
Carrier
Magnetic roller
Bias –400 VDC+AC
Printing
Semiconductor laser
Pw = 4.7 nJ/mm 2
Fur brush cleaning