December 2002 TOSHIBA TEC 3 - 1 e-STUDIO160/200/250 COPYING PROCESS
3. COPYING PROCESS
3.1 Copying Process
Charging: Negatively charges the surface of
the photosensitive drum.
Original exposure: Images are converted to
optical signals.
Scanning: Image optical signals are con-
verted to electrical signals.
Printing: Image electrical signals are con-
verted to optical signals (for laser emission)
and exposed on the photosensitive drum.
Development: toner adheres to the sur-
face of the photosensitive drum and forms a
visible image.
Transfer bias: Increases transfer efficiency.
Transfer: Transfers the visible image from
the drum onto the transfer (copy) sheet.
Separation: Separates the transfer sheet,
along with the toner, from the drum.
Fixing: Fixes the toner on the transfer sheet
by applying heat and pressure.
Cleaning: Mechanically removes any re-
maining toner on the drum.
Discharger LED array: Discharges any re-
maining charge from the drum.
03001
Fig. 3-1-1
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10
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Scanning
Image processing
CCD
600DPI (7450 pixels)
Orignal exposure
Xenon lamp
14 W : 1900 V rms
for e-STUDIO160 series
1250 V rms
for e-STUDIO200/250 series
Fixing
Heat roller
100V: 900W x 1
200V: 400W x 1
500W x 1
Paper exit
Cleaning
Discharger LED array
Wavelength 660 nm x 15
-637 V DC
for e-STUDIO160
series
Printing
Semiconductor laser
Pw = 3.5 nJ/mm
2
Toner
Carrier
Development
Magnetic roller
Bias -430 V DC
+150 V DC
for e-STUDIO160
series
Paper cassette
(550 sheets)
Paper feed unit
(550 sheets : Option)
Paper feed pedestal
(550 sheets : Option)
Sheet feed bypass
(100 sheets : Option)
Guide bias
+375 V DC
Transfer
H : 5.5 KV
C : 5.2 KV
Separation
H : -4.3 KV
C : -4.1 KV
L : -3.9 KV
Cassette module
(550 sheets : Option)
for e-STUDIO200/250 series
Large capacity feeder
(1250 x 2 sheets : Option)
for e-STUDIO200/250 series
Bias -460 V DC
+150 V DC
for e-STUDIO200/250
series
-674 V DC
for e-STUDIO200/250
series
Charger Charger
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