Toshiba e-studio550 Service Manual page 98
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Also See for e-studio550:
- Operator's manual (179 pages) ,
- Service handbook (314 pages) ,
- Operator's manual (148 pages)
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About reflection type photosensor
The reflection type photosensor is comprised of an infrared light emitting diode and a phototransistor. It
uses the pulse modulation to detect an original.
Original
8µsec
Phototransistor
130µsec
LED
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.
e-STUDIO550/650/810 SCANNING SECTION
6 - 14
JUNE 2002 © TOSHIBA TEC
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