Ricoh FT4460, Service Manual, Page: 118 / 413

28 February 1989
9.6 PAPER SIZE AND END DETECTION
Five
size.
microswitches in the cassette entrance detect each cassette is paper
The paper size switches [A] are actuated by a plate on the front of the
cassette. Each paper size has its own unique combination of notches in the
actuator plate [B]. The CPU reads which microswitches have been actuated
by the actuator plate to determine which size cassette has been inserted.
When a cassette or the LCT runs out of paper, the paper end feeler [C] drops
through a slot in the cassette (or LCT) bottom plate. The paper end actuator
[D], which is on the same shaft as the paper end feeler, pivots into the detec-
tor (photointerruptor). The paper end sensor [E] then sends a pulse signal to
the I/O control PCB, informing it that the cassette is empty. Then the Add
Paper indicator turns on, the Start key turns red, and the machine stops after
the copy is finished.
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