Toshiba e-studio 202L - Auto-Toner Circuit; General Description

e-STUDIO200L/202L/230/232/280/282 DEVELOPMENT SYSTEM June 2004 © TOSHIBA TEC
12 - 6
12.4 Auto-Toner Circuit
12.4.1 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.
- LCD panel:
Indicates toner-empty information.
Fig.12-5
NVRAM
IC31
ASIC
IC24
Motor driver
(
TA8428
)
IC1
Temperature/humidity sensor
LGC board
Developer unit
Toner density signal
Control voltage signal
Auto-toner sensor
Toner
Toner cartridge
Toner
motor
Developer material
Engine-
CPU
IC22
D/A converter
A/D converter
IC41
CPU
IC55
NVRAM
IC49
ASIC
IC14
North bridge
IC15
CPU
IC21
FRAM
IC23
ASIC
SYS board
e-STUDIO202L/232/282
Arithmetic and control unit
Control panel
Display panel
e-STUDIO200L/230/230L
/280/280S
05/11