Specifications

10. ORIGINAL SIZE DETECTION IN PLATEN
MODE
An original width sensor [A] and an original length sensor [B] are under the
exposure glass [C]. The original width sensor consists of two reflective
photosensors. The original length sensor consists of four reflective
photosensors.
While the main switch is on, these sensors are active and the CPU receives
their output signals through the interface board. The CPU checks the output
signals twice as the platen cover (document feeder) is being closed.
The first check is done when the platen cover position sensor [D] turns on.
(When the document feeder is installed, the first check is done when the DF
position sensor [G] on the document feeder turns on.) The platen cover
position sensor is actuated when the platen cover (document feeder) is
lowered to about 10 cm (4") above the exposure glass. At this time only the
sensors located underneath the original receive the reflected light. These
sensors output LOW signals.
[C]
[A]
[B]
[D]
[F]
[E]
[G]
1 December 1990
11-21