Ricoh Beluga-C1 Training page 202

Each roll has a roll end sensor. These sensors
detect roll end for paper rolls that have a black
core.
These sensors cannot detect roll end for rolls
that use a white core because they cannot detect
a change in color when the paper separates from
the roll.
Slide 202
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Roll End Detection
When the white paper separates from the black
core, the sensors detect this change in color
(white to black) and signal roll paper end.
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Beluga-C1/C1.5 Training