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e-STUDIO3511/4511 DEVELOPER UNIT 12 - 12 November 2003 © TOSHIBA TEC
12
12.6.3 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
position.
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.
BC-RAM
CPU
GA
PWA-SYS
PWA-LGC
CPU
GA
LCA301
Driver
Driver
OP-AMP
Control panel
Color toner cartridge sensor
Display
Color developer toner
supply clutch
Shutter solenoid
Color auto-toner sensor
Color developer
unit
Color toner
cartridge
Shutter driving
signal
Toner density
signal
D/A converter
Execution control unit
Fig. 12-603
Color developer toner supply clutch
control signal