Toshiba e-STUDIO200L Service Manual page 170
Multifunctional digital systems
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Also See for e-STUDIO200L:
- Service handbook (762 pages) ,
- Service manual (708 pages) ,
- Operator's manual (102 pages)
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About the reflection-type photosensor
The reflection-type photosensor is comprised of an infrared LED (Light Emitting Diode) and a pho-
totransistor. The sensor detects an original with a pulse modulation of LED.
8µsec
130µsec
The LED is driven by a pulse having a 130 µsec cycle and an 8 µsec ON time. When the pho-
totransistor 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-STUDIO200L/202L/203L/230/232/233/280/282/283
SCANNER
Original
LED
Fig. 6-18
© 2004 - 2008 TOSHIBA TEC CORPORATION All rights reserved
6 - 16
Photoransistor
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