Toshiba 4511, 3511 manual Magnetic circuit

(2)Functions of the black auto-toner sensor

a.Initializing function: When unpacking and replacing the developer material

The automatic adjustment is made so that the output of the auto-toner sensor (input value of the main CPU) will be 2.45V to 2.55V for the toner density of new developer material.

b.Toner density stabilizing function: During the printing operation Through the following phases, the toner density is kept constant.

Toner is consumed.

→Toner density decreases.

→Output change of the auto-toner sensor is detected depending on the humidity.

→Drives toner motor.

→Supplies toner to the developer unit from the toner cartridge.

c.Toner-empty detection/clear function:

Detects toner being empty in the toner cartridge. Drives toner motor.

→Output of the auto-toner sensor is not changed.

→Toner density is not changed.

→Detects toner being empty.

Toner-empty clear

Drives toner motor.

→Supplies toner from the toner cartridge.

→Output of the auto-toner sensor changes.

→Toner density recovers to its normal value.

→“Toner-empty” is cleared.

(3)Operations of black auto-toner sensor

The black auto-toner sensor is composed of the following circuits.

Drive winding	: Magnetic head (primary side) with a high-frequency magnetic field,
	which forms a magnetic circuit in the developer material
Detection winding	: Receiving the changes in the magnetic resistance of the developer
	material via a magnetic circuit (secondary side)

DC conversion circuit : Converting the high-frequency output from the detection winding to a DC signal

Magnetic resistance
Drive	Detection	DC	Auto-toner output
				Main CPU
		conversion
winding	winding		VATS
		circuit		(LGC board)

(Developer material)

Magnetic circuit

Fig. 12-504

12

November 2003 © TOSHIBA TEC 12 - 7 e-STUDIO3511/4511 DEVELOPER UNIT