2A3/4
1-3-76
(12-4) Detecting the paper level
The lift rises as paper in the deck is used. When the remaining number of sheets in
either right or left cassette reduces to around 100 to 250 sheets, the projection on the lift
belt assembly pushes against the sensor lever which turns the relevant paper level
detection sensor 1 or 2 (PLDSENS1/2) on.
When both paper level detection sensors 1 and 2 (PLDSENS1, 2) have turned on, the
message “Low on paper.” is shown on the copier touch panel. This message is not
shown when only one of them is on.
As more copies are made with the message on, paper path sensors 1, 2 and 3
(PPSENS1, 2, 3) or the paper empty sensor (PESENS) start to detect absence of
paper, and the message on the copier touch panel changes to “Place paper in deck.”
Lift belt
assembly
Paper level
detection sensor 1
Sensor lever
Paper level
detection sensor 1
When paper level detection sensor 1 is off When paper level detection sensor 1 is on
Lift belt assembly
Sensor lever
Figure 1-3-63 Detecting the paper level
CN2-3
CN2-6
PDMPCB
PLDSENS2 PLDSENS1
Figure 1-3-64 Paper level detection system block diagram
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