Acer S2W 3300U Service Manual - Page 7

(4) Receiving The CCD receives the light, then transfers the intensity of light to voltage signal. The voltage signals are data for the future process. LIGHT VOLTAGE SIGNAL CCD Fig. 3-3 Receiving 3.2 Scan Process (1) Preset Put the object (it can be paper, picture, book ...etc.) you want to scan on the scanner's window glass and close the scanner cover. If the object is too thick to close the cover, then you can ignore the cover. But it is better to close the cover for better scanning image quality. (2) Preview The scan module scans roughly (75dpi) over all the range of the object (A4 or Letter), and show the object's size and position on the monitor. (3) Pick Target In this stage, the user must decide the scanned area and position. In addition, user can select the scanning condition, such as scan types (color or gray), resolution (DPI), hi-light...etc