Paper Sensor; Paper Full; Fail Safe Feature - Ricoh B202 Service Manual

REGULAR TRAY

Paper Sensor

As illustrated in the previous paragraph (! Ready Position), the paper height
sensor [F] can detect either the tray edge or the paper stack. Therefore, the signals
from the paper height sensor are not enough to let the controller know if any paper
is on the tray.
To find the paper on the regular tray, the controller references the paper sensor [E].
This sensor detects the paper but does not detect the tray.

Paper Full

While the stack-tray rollers and belts continue to transport the paper to the regular
tray, the ready position becomes lower (! Ready Position). When the number of
paper reaches about 500 sheets, the paper full sensor [B] is interrupted by its
actuator. When the number of paper reaches about 1,000 sheets, the lower limit
sensor [C] is interrupted by its actuator. To decide the paper-full status, the
controller considers these sensor signals and the paper sizes. The table lists the
paper sizes and the numbers of paper in the paper-full status.
Paper Size Number of Paper
A3, B4, DLT, LG About 500 sheets
Smaller sizes About 1,000 sheets

Fail Safe Feature

When the regular tray reaches its uppermost position, the upper limit sensor [A]
detects it. The finisher stops its operation.
The regular tray does not reach this position in normal operations. The upper limit
sensor works as a failsafe feature. If the regular tray fails to actuate the paper
height sensor [F] because of some hardware error, this failsafe feature works.
B602 58 SM