Oki OKIPAGE 14i Service Manual page 62

Operation during Toner Low state
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When the stirring bar reaches the maximum height, it falls to the minimum height due to its own weight, since there is no resistance provided by the toner on
the other side. Because of this, the time interval during which it is in encounter with the magnet of the sensor lever becomes longer. By monitoring this time
interval, Toner Low can be detected.
TONER FULL state
TONER LOW state