Read Sharp AR-651 (serv.man7) Service Manual online
AR-651/810 COPY PROCESS 3 - 3
CCD light
receiving
amount
receiving
amount
Value of
image signals
to be output
image signals
to be output
Light
255
Dark
0
Difference between
"light " and "dark" is
divided into 256
steps.
(3) Scanning
Scanning is a process of exposing the original to
the light and converting the reflection into electrical
signals.
The light reflected from the original is imported to
the charge coupled device (CCD) and this optical
image information is converted into electrical sig-
nals (image signals), which are then sent to the
image processing section.
CCD
Image processing
section
(Example)
쩪
쩪
Rotation of drum
Main charger
Grid control circuit
Discharge
transformer
(2) Charging
Charging is a process of applying a charge uniformly
to the photoconductive drum surface.
The charger wire produces a negative corona dis-
charge, which is controlled by the grid so that the
drum surface is uniformly charged with negative po-
tential.
The surface potential on the drum is determined by
the grid potential and controlled to a specifed value
by the grid control circuit as determined by the proc-
ess controll system.
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