Ricoh Di-C1 Manual page 117

Original Size Detection – Platen Mode
Reflective photosensors detect the length. The CCD detects the
width.
Slide 117
When the ADF is opened, the scanner carriage moves 30 mm from the home
position.
Then, when the ADF is closed, the exposure lamp turns on and the CCD
detects the paper width.
The lamp turns on when the platen cover sensor detects that the cover
is being closed.
If the cover stays open during copying, the CPU checks the original size
when the Start key is pressed.
When feeding with the ADF, the width and length sensors in the ADF detect
the original size.
Platen Cover
Sensor
117
Di-C1 Training
Length
Sensors
CCD