Auto-Toner Circuit; General Description - Toshiba e-STUDIO453 Service Manual

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
· Toner motor
· Display
Control panel
12
Toner cartridge
e-STUDIO350/352/353/450/452/453
DEVELOPMENT SYSTEM
: Controls the toner density so that the toner in the developer material is
fixed to certain ratio.
: Supplies toner to the developer material.
: Indicates toner-empty information.
Display panel
Toner
Toner
motor
Auto-toner sensor
Developer material
Developer unit
Arithmetic and control unit
e-STUDIO352/353/452/453
FRAM CPU
IC21 IC15
ASIC GA North bridge
IC23 IC14
Control D/A
voltage signal
converter
IC2
Toner density
signal
Fig. 12-401
12 - 4 © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
07/11
SYS board
e-STUDIO350/450
NVRAM
IC38
CPU
ASIC GA
IC52
IC54
LGC board
ASIC GA
IC38 Engine
CPU
IC24
TA8428
IC51