Toshiba DP1600 Service Manual page 50

3. COPYING PROCESS
3.1 Copying Process
Image processing
1
4
Printing
Semiconductor laser
Pw = 3.5 nJ/mm 2
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:
face of the photosensitive drum and forms a
visible image.
December 2000 © TOSHIBA TEC
3
Scanning
CCD
600DPI (7450 pixels)
11
Discharger LED array
Wavelength 660 nm x 15
Charger Charger
-674 V DC
-637 V DC
for DP2000/2500
for DP1600 series
series
Toner
Carrier
Bias -460 V DC
+150 V DC
for DP2000/2500 series
Large capacity feeder
(1250 x 2 sheets : Option)
for DP2000/2500 series
toner adheres to the sur-
2
Orignal exposur
Xenon lamp
14 W : 1900 V rms
for DP1600 series
1250 V rms
for DP2000/2500 series
9
Fixing
Heat roller
Paper exit
100V: 900W x 1
200V: 400W x 1
10
Cleaning
5
Development
Magnetic roller
Bias -430 V DC
+150 V DC
for DP1600 series
Paper cassette
(550 sheets)
Paper feed unit
(550 sheets : Option)
Paper feed pedestal
(550 sheets : Option)
Cassette module
(550 sheets : Option)
for DP2000/2500 series
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 remain-
ing toner on the drum.
Discharger LED array: Discharges any re-
maining
3 - 1
500W x 1
8
Separation
H : -4.3 KV
C : -4.1 KV
L : -3.9 KV
7
Transfer
H : 5.5 KV
C : 5.2 KV
6
Guide bias
+375 V DC
Sheet feed bypass
(100 sheets : Option)
Fig. 3-1-1
charge from the drum.
1600/2000/2500 COPYING PROCESS
03001