e-STUDIO167/207/237 © 2007 - 2008 TOSHIBA TEC CORPORATION All rights reserved
DEVELOPMENT SYSTEM
12 - 8
12.5 Auto-Toner Circuit
12.5.1 General description
1) Function of the auto-toner circuit
- Detects the toner density in the developer material, and supplies toner when the density is low-
ered to a certain level.
- Detects that there is no toner left in the cartridge (toner-empty detection).
2) The auto-toner circuit consists of the following:
- Auto-toner sensor:
Detects the toner density.
- Control section:
Controls the toner density so that the toner in the developer material is fixed to certain ratio.
- Toner motor:
Supplies toner to the developer material.
- Control panel:
Indicates toner-empty information.
- Recovered toner supply section:
The main motor supplies the recovered toner to the developer unit from the recovered toner sup-
ply mechanism.
Fig. 12-4
Toner
Developer material
Auto-toner sensor
Toner cartridge
Recovered toner
supply section
Temperature/humidity sensor
Toner
motor
Recovered
toner
Recovered toner
supply mechanism
Main
motor
A/D
converter
D/A
converter
ASIC
SoC
Flash ROM
Control panel
Control section
MAIN board
Developer unit
Control voltage signal
Toner density signal
"Toner Empty"
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