Toshiba e-STUDIO556 Service Manual page 109

3.9.5 Automatic Original Size Detection Circuit
[ 1 ] e-STUDIO556/656/756/856
Reflection type photosensors are placed on the base frame of the scanner unit as shown in the figure
below. Each sensor consists of an infrared Light Emitting Diode (LED) on the light emitting side, and a
phototransistor on the light receiving side.
When there is an original on the original glass, light beams from the LEDs are reflected by the original
and led to the phototransistors. This means that the presence of the original is detected by the
presence of reflection (when scanning black image).
[A4 Series]
[LT Series]
© 2011 - 2014 TOSHIBA TEC CORPORATION All rights reserved
A5 B5 A4
APS-R
APS-C
A5-R
APS-3
APS-1
APS-2
Fig. 3-42
ST LT
APS-C
ST-R
APS-3
APS-2
Fig. 3-43
3 - 63
B5-R
A4-R
B4
APS-R
LG
LT-R
e-STUDIO556/656/756/856/557/657/757/857
A3
LD
OUTLINE OF THE MACHINE
3