Copying Process - Toshiba 4560 Service Manual

3. COPYING PROCESS

3.1 Copying Process
Original exposure
2 Halogen lamp
7
Fixing
Paper exiting
Heat roller
900 W (115V)
1100W (220/240V)
1 Charging : Negatively charges surface of
the photosensitive drum.
2 Exposure : Forms an electrical image on
the drum.
3 Development :
photosensitive drum and forms
a visible image.
4 Transfer bias : Increases transfer efficiency.
5 Transfer : Transfers the visible image
from the drum onto the transfer
(copy) sheet.
Nov. 1997 © TOSHIBA
300 W
LED eraser array
63 LEDs
Charging
1
–705V ±5 V
Discharge lamp
9
1.8W x 9 lamps
8
+
Cleaning
+
Separation
AC 4.15 kV
+DC325V
1 kHz
6
toner adheres to surface of
_ _
_
+
_
_
+ +
Transfer
–5.76 kV DC
5
6 Separation
7 Fixing
8 Cleaning
9 Discharge lamp : Discharges any remaining
3 - 1
Toner
Carrier
_
3
+
_ Black development
Magnetic roller
_
+
Bias: –150 VDC
+
Sheet-bypass feeding
(50 sheets)
Cassette feeding (upper
/lower/PFP)(600 sheets)
LCF feeding
(1500/4000 sheets)
4
Transfer bias
–1200 V DC
: Separates the transfer sheet,
along with the toner, from the
drum.
: Fixes the toner on the transfer
sheet by applying heat and
pressure.
: Mechanically removes any re-
maining toner on the drum.
charge from the drum.
4560/4570 PROCESS