Toshiba e-STUDIO163 Service Manual page 55

2) Charging
Charging is the process to apply charge evenly on the drum surface.
The needle electrode produces negative corona discharge is controlled by the grid, allowing the
drum surface to be evenly charged with the negative potential.
The surface potential on the drum is determined by the grid potential and is controlled to a certain
value by the grid control circuit.
3) Data reading (scanning)
Data reading is the process of illuminating the original with light and converting the reflected light
into electrical signals.
This equipment uses the CIS (Contact Image Sensor) for data reading.
The optical image information read by the CIS is converted into electrical signals (image signals),
which are then transmitted to the image processing section.
CIS
Fig. 3-5
© 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
Main charger
High-voltage
transformer
Fig. 3-4
(Example)
Image processing
section
3 - 3
Drum rotation
Grid control circuit
Light
Value of image
receiving
signals to be
amount
output
Light 255
Dark 0
Fig. 3-6
Difference between
"light " and "dark" is
divided into 256 steps.
e-STUDIO163/203
COPY PROCESS
3