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Toner Collecting Section Main Unit Theory of Operation
2-60
II Composition/Operation
B. Waste toner status decision after detection of a waste toner near-full condition
• Opening and closing the Front Door resets a waste toner near-full condition. The control
state then proceeds to “waste toner status decision.”
• If the Waste Toner Full Sensor (PC11) produces an output of a predetermined voltage or
more for a continuous period of a predetermined time a second time during “waste toner
status decision,” the control state proceeds to “waste toner full detection.”
• If the Waste Toner Full Sensor (PC11) does not produce an output of a predetermined
voltage or more for a continuous period of a predetermined time during “waste toner
status decision,” the control state proceeds to “waste toner near-full condition reset
decision.”
C. Waste toner near-full condition reset decision after detection of a waste toner
near-full condition
• If a waste toner near-full condition is not detected during “waste toner status decision,” a
“waste toner near-full condition reset decision” is made. (Control for preventing false
detection of a waste toner near-full condition.)
• If a waste toner near-full condition is not detected a second time when the number of
print dots (waste toner detection dot count) reaches a predetermined value after the
Front Door has been closed, the waste toner near-full condition is reset. If a waste toner
near-full condition is detected a second time, the machine determines that there is a
waste toner near-full condition.
• If a waste toner near-full condition is detected a second time before the number of print
dots (waste toner detection dot count) reaches a predetermined value after the Front
Door has been closed, the machine determines that there is a waste toner near-full con-
dition.
Power source
Full condition
Waste toner /
Status decision
Full condition
detection
Full condition
reset decision
Near-full
condition reset
Near-full
condition
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