Toshiba e-STUDIO200L Service Manual page 107

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.
The light reflected from the original is directed to the charge coupled device (CCD) and this optical
image information is converted into electrical signals (image signals), which are then transmitted to
the image processing section.
Image processing
Fig. 3-5
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Main charger
High-voltage
transformer
Fig. 3-4
(Example)
CCD
section
3 - 3
Drum rotation
Grid control circuit
CCD light
Value of image
receiving
signals to be
amount
output
Light 255
Dark 0
Fig. 3-6
e-STUDIO200L/202L/203L/230/232/233/280/282/283
Difference between
"light " and "dark" is
divided into 256 steps.
COPY PROCESS
3