SATO WS4 Series - Reflective Sensor

3 Printer Operation Media Sensing
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3.4.2 Reflective Sensor
The reflective sensor is movable within the entire width of the media. It
detects gaps, notches and black marks not located at the center of the
media.
Multi Columns
Notch
Black Mark
Flip the media so the black-mark side is facing down to align with the
sensor.