Toshiba e-studio281c - Black Toner Cartridge Drive Unit; General Descriptions; Toner Motor (M3)

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DEVELOPER UNIT
12 - 3
12.3 Black Toner Cartridge Drive Unit
12.3.1 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.
12.3.2 Toner motor (M3)
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 pro-
tection device becomes high to cut off the current.
Its circuit configuration is shown below.
Fig. 12-2
Signal level for motor circuit
Signal
State
KTNA1A KTNA1B
LLOFF
L H CW (when supplying toner)
H L CCW (detecting cartridge installation)
HHBrake
Gate array
#2
+24V
+5.1V
Motor
driver
IN1
KTNR1A
KTNR2A
KTNDET
KTNR1A
KTNR1B
IN2
OUTA
OUTA
Overcurrent
protection
device
KTNA1A
KTNA1B
Toner motor
LGC board
KTNDET
Black toner
cartridge
switch