Ricoh FT4430 Service Manual page 89

16 April '88
2. Paper End Detection
When a cassette or the LCT runs out of paper, the paper end feeler (A] drops
through a slot in the cassette (or LCT) bottom plate. The paper end actuator
[B], which is on the same shaft as the paper end feeler, pivots into the
detector (photointerrupter). The paper end sensor [C] then sends a HIGH
signal to the CPU, informing it that the cassette is empty. Then the Add Paper
indicator turns on, the Print key turns red, and the machine stops after the
copy is finished.
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