Paper Volume Detection - Ricoh FT5540 Service Manual

31 August 1989

5.3 PAPER VOLUME DETECTION

The paper volume detection system of the large capacity tray is similar to that of the cassettes.
Both systems use the same data bus, signals, and sensor type. However, the mechanism of
detection and meaning of the display are different.
Unlike cassette volume detection, the paper volume actuator plate [A] of the large capacity
tray is not moved by the sector gear. Instead, the actuator plate is moved by the tray wire
attached to the tray drive shaft [B].
When the large capacity tray is full (approximately 1,000 sheets), the first four indicators are lit.
The indicators turn off one at a time, each after approximately 225 sheets of paper have been
fed. The last indicator is the only one remaining lit when about 130 sheets remain in the tray.
This indicator turns off after the last sheet has been fed.
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