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Toner cartridge
Outline
Toner cartridge is filled with toner and supplies to the drum unit.
The toner in the toner cartridge is fed to the sub hopper and then to the developing assembly by the toner feed screw. The toner presence/absence in the sub hopper is detected by the sub hopper toner sensor (S26) which is a magnetic permeability sensor.
If the developing assembly toner sensor (S25) detects the absence of the toner in the developing assembly, the hopper motor (M16) drives to rotate the toner feed screw to feed toner in the sub hopper to the developing assembly. Also, if the sub hopper toner sensor (S26) detects the absence of the toner in the sub hopper, the bottle motor (M17) drives to rotate the toner cartridge to feed the toner in the Toner cartridge to the sub hopper.
If the sub hopper toner sensor (S26) keeps detecting the absence of the toner for more than the specified period of time, no toner in the toner cartridge is assumed and the message to replace the Toner cartridge will be displayed. Also, if the developing assembly toner sensor (S25) keeps detecting the absence of the toner for more than the specified period of time, no toner in the developing assembly is assumed and a No Toner error message will be displayed.

S26 | Sub hopper toner sensor
M1 | Main motor
M16 | Hopper motor
M17 | Bottle motor
[1] | Sub hopper toner sensor detection signal
[2] | Bottle motor drive signal
[3] | Main motor drive signal
[4] | Hopper motor drive signal