Toshiba e-STUDIO2330C Service Manual page 139

• The followings are determined by output signals from the APS sensors.
- Size (The combination of the signals satisfy any in the above chart)
Size is displayed on the control panel and a specific paper or reproduction ratio is selected.
- Size retention (The combination of the signals do not satisfy the above chart)
The latest original size recognized (or no original state) until new paper size is recognized.
- No original (Output from all the sensors are "1".)
Reproduction ratio and paper are not selected.
• Size change is always observed and detected.
• The carriage-1 stays at the standby position even if the reproduction ratio changes
corresponding to the change of the original size.
* When the platen sensor (S7) is ON;
The latest original size (or no original state) recognized right before the platen sensor (S7) is turned
ON is retained regardless of the status the APS sensor output signals.
About reflection type photosensor
The reflection type photosensor is comprised of an infrared light emitting diode and a phototransistor. It
uses pulse modulation to detect an original.
8 µsec
130 µsec
The light emitting diode is driven by a pulse having a 130 µsec. cycle and an 8 µsec. ON time. When
the phototransistor receives the same signal as this pulse, it is determined that there is an original. The
pulse modulation is performed inside the reflection type phototransistor.
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Original
LED
Fig. 7-17
7 - 15
Phototransistor
e-STUDIO2330C/2820C/2830C/3520C/3530C/4520C
7
SCANNER