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November 2003 © TOSHIBA TEC 12 - 3 e-STUDIO3511/4511 DEVELOPER UNIT
12
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.
PE0
PE2
PB7
LCA301-2
KTNDET
KTNA1B
KTNA1A
TD62385
TA8428K
Gate array
Motor driver
Toner motor
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
Black toner
cartridge
Overcurrent
protection
device