Toshiba 4511, 3511 manual Black Toner Cartridge Drive Unit, General descriptions, Toner motor

12.4 Black Toner Cartridge Drive Unit

12.4.1 General descriptions

The black toner cartridge is filled with black toner, and supplies the toner to the black developer unit by rotating the toner cartridge with the drive of the toner motor. The black toner cartridge detection switch ensures that the black toner cartridge is in rotation by detecting the protrusion of the toner cartridge. Also, the auto-toner sensor detects whether the toner cartridge is empty by detecting the toner density ratio of the black developer unit.

12.4.2 Toner motor

The toner motor supplies toner to the black developer unit from the toner cartridge. It is driven by the motor driver IC (TA8428K) through an overcurrent protection device. The overcurrent protection device is mounted to protect the toner motor and toner motor driver. When the motor abnormality occurred and the motor drive current exceeding the specified level surged, internal resistance of the overcurrent protection device becomes high to cut off the current.

Its circuit configuration is shown below.

		Motor driver		Overcurrent	Toner motor
	TD62385		TA8428K
PE0				protection	KTNA1A
				device
PE2					KTNA1B
Gate array
LCA301-2
PB7					KTNDET
					Black toner
					cartridge
			Fig. 12-401

Signal level for motor circuit

		Signal		State
	KTNA1A-0		KTNA1B-0
	L		L	OFF
Level	L		H	CW (when supplying toner)
	H		L	CCW (detecting cartridge installation)
	H		H	Brake

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November 2003 © TOSHIBA TEC 12 - 3 e-STUDIO3511/4511 DEVELOPER UNIT