Toshiba e-STUDIO520 Service Manual page 258

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.
Developer unit
Recycle toner
supply section
Recycle toner
hopper
Hopper
Recycle
motor
toner
e-STUDIO520/600/720/850 DEVELOPER UNIT
Control panel
LCD panel
Temperature/humidity sensor
New toner supply section
Toner cartridge
New toner
Sub hopper
New toner
Auto-toner sensor
Developer material
SYS board
LGC board
New toner
supply
motor
A/D converter
New toner
transport
motor
Toner density signal
Control voltage signal
Fig.12-7
12 - 12
Control section
System CPU
IC9
FRAM
North Bridge
IC23
ASIC
IC27
IC58
NVRAM
Main CPU
IC18
A/D
converter
March 2005 © TOSHIBA TEC
IC17
IC16
IC56
ASIC