Ricoh FT8680 Service Manual page 50

OPTICS 31 July 1995
5.3 SCANNER POSITION SENSORS
[A]
[B]
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There are two scanner position sensors located at the front side of the optics
unit.
The scanner home position sensor [A] is used to detect the home position at
the machine initialization and during the scan cycle.
The scanner return position sensor [B] is used to detect the scanner position
for the process control data initialization (Vd and ADS data). The return
position sensor is not used during normal copying.
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