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3.4 Toner Cartridge
3.4.1 Methods for Detecting Toner Life
When the machine detects the toner life end, "Replace Toner" is displayed. 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 develop roller.