Roll End Detection - Ricoh Aficio 480W Dolphin-C2 Service Manual

28 April 2005 PAPER FEED AND REGISTRATION

6.7.8 ROLL END DETECTION

[A]
[C]
[C]
[B]
[B]
B188D906.WMF
[D]
Roll end is detected with reflective photosensors that detect the exposed, black
core of an empty roll.
In the 1st roll tray unit, the photosensors [A] are mounted above the two paper
rolls.
In the optional 2nd roll tray unit, the photosensors [B] are at the front and rear of
the paper rolls.
In addition to the photosensors, two paper end sensors [C] are mounted in the 1st
roll tray, and two paper end sensors [D] are mounted in the optional 2nd roll tray.
These paper sensors detect the end of the paper roll if the core of the paper roll is
any other color than black and cannot be detected by the photosensors.
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