Toshiba E-STUDIO520 - Page 258

e-STUDIO520/600/720/850 DEVELOPER UNIT March 2005 © TOSHIBA TEC
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2) Configuration of the auto-toner circuit
- Auto-toner sensor:
Detects the toner density.
- Toner cartridge empty sensor:
Detects that the new toner is almost consumed. (The toner cartridge is empty.)
- Control section:
Controls each section to maintain the toner density of the developer material at a constant ratio.
- Control panel:
Displays a status that the toner cartridge is nearly empty.
- New toner supply section:
The new toner supply motor and the new toner transport motor in this section supply the new
toner to the developer unit from the toner cartridge.
- Recycle toner supply section:
The hopper motor in this section supplies the recycle toner to the developer unit from the recycle
toner hopper.
Fig.12-7
New toner
Sub hopper
Developer material
Auto-toner sensor
New toner
Toner cartridge
New toner supply section
Recycle toner
supply section
Temperature/humidity sensor
New toner
transport
motor
New toner
supply
motor
Recycle
toner
Recycle toner
hopper
Hopper
motor
IC18
A/D
converter
IC58
Main CPU
A/D converter
IC56
ASIC
IC23
ASIC
IC16
North Bridge
IC17
System CPU
IC9
FRAM
IC27
NVRAM
Control panel
SYS board
Control section
LGC board
Developer unit
LCD panel
Control voltage signal
Toner density signal