Principle of Detection by toner Sensors

Movements of that sensor lever of a toner cartridge which is powered by an image drum (ID) motor are read by a toner sensor for detecting that the cartridge is low on toner. The lever moves concurrently with movement of a mixing bar placed in the cartridge. With the lever, or the sensor, contaminated with toner etc., or the cartridge not facing the sensor properly due to improper ID unit or toner cartridge installation, the sensor may not properly detect the cartridge being low on toner, causing a toner sensor error.

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