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Main Unit Theory of Operation Toner Collecting Section
2-59
II Composition/Operation
10.3.6 Waste toner near-full condition detection
• A waste toner near-full condition is detected using the output state of the Waste Toner
Full Sensor.
• A waste toner full condition is detected based on the dot count.
• The output value of the Waste Toner Full Sensor cannot be acquired during the AIDC
control (registration correction, gamma correction). During this period, therefore, the fol-
lowing control procedures are not performed: “waste toner status decision,” “waste toner
full condition reset decision,” “waste toner near-full condition reset decision,” and “waste
toner near-full condition detection control.”
A. Waste toner near-full condition detection control
• A waste toner near-full condition is detected when the Waste Toner Full Sensor (PC11)
continuously outputs a voltage of a predetermined value or more for a predetermined
period of time or more.
• At this time, a waste toner near-full condition warning is given on the panel.
• To prevent false detection, a conveying screw is installed in the Waste Toner Box, ensur-
ing that waste toner is uniformly accumulated in the box.
Power source
Full condition
Waste toner /
Status decision
Full condition
detection
Full condition
reset decision
Near-full
condition reset
Near-full
condition
4138to2137e0
4138to2081c0
Waste Toner Full Sensor (PC11)
Box Tray
When the sensor is unblocked When the sensor is blocked
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