Copying Process - Toshiba 1550 Service Manual

3.

COPYING PROCESS

3.1 Copying Process
Document exposure
2 Halogen lamp
7
Fixing
Paper exit
Heat roller
Max. 200 sheets
900 W
1 Main charger : A negative electrostatic charge
is placed on the photoconduc-
tive (photosensitive) surface of
the drum.
2 Exposure
: Forms an electrostatic latent
image on the photoconductive
surface of the drum.
3 Development : Positively charged toner is at-
tracted to the photoconductive
surface of the drum to form a
visible image.
4 Transfer bias : Raises transfer efficiency.
5 Transfer
: Transfers the visible toner im-
age from the surface of the
drum to the copy paper.
Mar. 1998 © TOSHIBA
300 W
Main charger
Grid
–691 ±5 V
Discharge lamp
9
LED
8
Cleaning
Separation
AC 3.6 kV
1000 Hz
1
_ _
_
+
+
+
_
_
+ +
Transfer
–DC 6 kV
5
6
6 Separation
7 Fixing
8 Cleaning
9 Discharging
3 - 1
LED
eraser array
Toner
Carrier
_
3
Development
+
_
Magnetic roller
_
+
Bias –200 VDC
+
Manual feed
Cassette paper feed
(500 sheets)
4
Transfer bias
–DC 1.2 kV
: The copy paper is separated
from the surface of the drum
together with the toner image.
: The toner image is fixed to the
copy paper by heat and pres-
sure.
: Any toner remaining on the
photoconductive surface of the
drum is mechanically removed
by the cleaning blade.
: Erases the electrostatic charge
remaining on the photoconduc-
tive surface of the drum.
1550/1560 PROCESS