Xerox Phaser 6120 Service Manual page 259

To prevent false detection, the Imaging Unit is provided with the Toner Agitating Screw
that ensures that the waste toner is evenly stored.
.
Light Guide LED Light
Normal Condition
Waste Toner Near Full Condition Detection Control
Light emitted from the LED mounted on the Waste Toner Near Full Detection Board
(PWB-C) is made to travel through the light guide. This light is blocked if the waste toner
reaches an upper limit, which allows the machine to determine that there is a waste toner
near full condition.
To prevent false detection, the Imaging Unit is provided with the Toner Agitating Screw
that ensures that the waste toner is evenly stored.
Waste Toner Full Detection Control
The machine determines that there is a waste toner full condition when 200 images* are
reached after a waste toner near full condition has been detected. (* The initiation of any
new print cycle is prohibited when 50 full-color printed pages are produced after the waste
toner near full condition has been detected.)
When light of the LED on the Waste Toner Near Full Detection Board (PWB-C) is
unblocked after the Imaging Unit has been replaced, the waste toner full condition is reset.
Phaser® 6120 Color Laser Printer Service Manual
Waste Toner Detection Area
Light Guide
Waste Toner Near Full
Detection Board (PWB-C)
Waste Toner
LED
At Waste Toner Near Full Condition
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Print Engine Theory of Operation
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