Color Auto-Toner Sensor Circuit - Toshiba e-STUDIO281c Service Manual

12.5.3

Color auto-toner sensor circuit

1) General descriptions
The color auto-toner sensor detects the toner amount on the color developer sleeve with the reflec-
tion- type photosensor, differing from the black auto-toner sensor. Light-receiving elements of diffuse
reflection in this sensor detect the toner amount on the sleeves with the light amount reflected from
the sleeve surface. It detects the toner amount at the first forward position from the developing posi-
tion.
When the toner runs out, it supplies the toner from the toner cartridge with the color toner supply
auger driven by the color developer toner supply clutch.
Also, the color auto-toner sensor has a shutter which opens and closes by the solenoid. It prevents
stain to the sensor and calibrates the sensor with the reflection from the shutter.
Control panel
LCD panel
Developer
motor
Color
Clutch control signal
developer
toner supply
clutch
Color auto-toner sensor
Color developer
unit
Color toner
cartridge
© 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
Color toner
cartridge sensor
Toner density signal
Color auto-toner sensor
shutter solenoid
Control voltage signal
Shutter driving signal
Fig. 12-9
12 - 11
Control unit
SYS board
FRAM
North Bridge
ASIC
LGC board
Gate array
#2
Engine
CPU
A/D converter
D/A
converter
System
CPU
NVRAM
Gate array
#1
e-STUDIO281c/351c/451c
DEVELOPER UNIT
12