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Konica Minolta Bizhub 20p Service Manual: Toner Cartridge; Methods For Detecting And Counting Toner Life

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3.3

Toner Cartridge

3.3.1 Methods for Detecting and Counting Toner Life
When the machine detects the toner life end, the red Status LED lights on, and the Toner
LED lights on at the same time. in the state. The toner life is displayed through the following
two ways. First, such indication is displayed when detection is performed by the toner
sensor; second, it is displayed at the time when a rotation rate of the develop roller reaches
its upper limit.
(1) Detection by the toner sensor
The low amount of toner remaining can be detected by checking the imperviousness to
light of the toner in the cartridge by means of the transmissive photosensor.
(2) Detection by means of rotation rates of the develop roller reached its upper limit
The machine counts the accumulated number of the rotations for the develop roller.
2-11
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