Toshiba e-STUDIO555 Service Manual page 235

(2) Toner cartridge drive unit
The toner cartridge drive unit consists of the toner cartridge holder which rotates the toner
cartridge, and the sub-hopper.
Toner cartridge
empty sensor
New toner
transport motor
• Toner cartridge holder
The toner cartridge holder includes a coupling to hold the toner cartridge, the new toner
supply motor (M5) to rotate the cartridge, the toner cartridge detection switch (SW2) to detect
the rotation of the cartridge, and the toner cartridge empty sensor (S10) to detect the empty
status of the cartridge.
• New toner supply motor (M5)
The drive of the new toner supply motor (M5) is transmitted to the toner cartridge holder
through the pulley, timing belt and gear, and thus the coupling of the holder is rotated. The
cartridge is rotated along with the rotation of the coupling to supply the toner.
• Toner cartridge detection switch (SW2)
This switch detects the rotation of the toner cartridge.
• Toner cartridge empty sensor (S10)
This sensor is a piezoelectric type sensor which detects the empty status of the cartridge.
When the toner is adhered on the surface of this sensor, a correct detection cannot be
performed. Therefore a blade to scrape off the toner adhered on the sensor surface is
equipped on the toner cartridge holder. This blade is rotated by the drive of the new toner
supply motor (M5).
• Sub-hopper
The sub-hopper consists of the paddle to mix the toner transported from the cartridge, and the
auger to transport the toner to the developer unit.
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New toner supply motor
Toner cartridge
detection switch
Fig. 11-2
11 - 3
Toner cartridge holder
Developer unit
Sub-hopper
e-STUDIO555/655/755/855
11
DEVELOPER UNIT