e-STUDIO350/450 DEVELOPMENT SYSTEM 12 - 4 November 2003 © TOSHIBA TEC
12
IC52
CPU
IC38
NVRAM
IC54
ASIC GA
IC38
ASIC GA
IC51
TA8428
SYS board
Arithmetic and control unit
LGC board
Control panel
Developer unit
Toner density
signal
Control
voltage signal
Auto-toner sensor
Toner
Toner cartridge
Toner
motor
Developer material
Display panel
IC24
MAIN
CPU
IC2
D/A
converter
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 lowered
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.
· Display : Indicates toner-empty information.
Fig. 12-401
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