Toshiba 3511, 4511 manual Color auto-toner sensor circuit

12.6.3Color 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.

12

Control panel

Display

Execution control unit

PWA-SYS

BC-RAM

GA

CPU

Color toner cartridge sensor

Color developer toner supply clutch control signal

Color developer toner supply clutch

Color auto-toner sensor

Shutter driving

signal

Shutter solenoid

Toner density

signal

Color developer

unit

Color toner

cartridge

Driver	GA
	LCA301
D/A converter
Driver

CPU

OP-AMP

PWA-LGC

Fig. 12-603

e-STUDIO3511/4511 DEVELOPER UNIT 12 - 12 November 2003 © TOSHIBA TEC