Toshiba e-STUDIO2008A Service Manual page 81

3.8.5 Process of detection of original size
In this equipment, detection of original sizes is performed with the combination of a CCD and the
automatic original detection sensors-1 and -2 (S1 and S2).
A size in the primary scanning direction is detected by the CCD while that in the secondary scanning
direction is detected by the sensors.
[ 1 ] Original size detection procedure
A
S20
S21
A: Platen cover (or RADF) fully opened
B: Platen cover (or RADF) opened by 20 degrees - Detected by the platen sensor-1 (S20)
C: Platen cover (or RADF) closed - Detected by the platen sensors-1 & -2 (S20 & S21)
The position of the platen cover (or the RADF) is detected by the platen sensors-1 and -2 (S20 and
S21).
When the platen cover is fully opened, an original size is not detected. (Figure A)
When the platen cover is gradually closed and its tilt angle reaches approx. 20 degrees, the platen
sensor-1 (S20) detects that the platen cover is closed. (Figure B)
When this status is detected, the exposure lamp of the scanner emits light.
Then the emitted light is reflected by the original and read to the CCD as original size data.
The light reflected from an area with no original placed is very little, a size in the primary scanning
direction can be detected with the intensity of the reflected light. (Fig. 3-21/3-22: Size1 to Size 8)
When the platen cover is fully closed, the platen sensor-2 (S21) also detects that the platen cover is
closed. (Figure C)
When this status is detected, the automatic original detection sensors-1 and -2 (S1 and S2) detect a
size in the secondary scanning direction (and the presence of an original with the positions of the
sensors).
According to the sizes in the primary and secondary scanning directions detected in the procedures
above, the original size is specified.
As for the LT series, two automatic original detection sensors detect a size in the secondary scanning
direction due to their original size.
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S2
S1
B
Fig. 3-20
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C
OUTLINE OF THE MACHINE
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