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CF5001 Ver.1.0 Sep. 2003
1.2.4
Original reading control
The reflection from the exposed original reaches to the CCD sensor through the lens. The CCD sensor
outputs an electric signal (analog) proportional to the amount of light and then the analog signal is con-
verted to a digital signal in the CCD board (CCDB) according to directions from the overall control board
(OACB).
The CCD sensor includes three separate photoreceivers for the 1st colors R, G, and B. The A/D converter
signals for each color are also created separately.
A. Original reading timing
The original reading timing is same in the platen mode and in the DF mode when AE/ACS has not been
set; however, it is different when AE/ACS has been set.
(1) When AE/ACS has not been set
[1]
[2]
[4]
[5]
[6]
[7]
[1]
Home position
[2]
PS1
[3]
Platen APS position
[4]
1st white correction
[3]
[5]
2nd white correction
[6]
Exposure scan (220 mm/s)
[7]
Home position search
2-5
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