Toshiba e-studio550 Service Manual page 182

12. 5. Auto-toner Sensor Circuit
12. 5. 1. General description
(1) Functions of auto-toner circuit
• Detection of the toner density in the developer material
~ density lowered
• Detection of the toner being empty in the toner cartridge
(2) Configuration of auto-toner circuit
• Auto-toner sensor
• Control section
• New toner supply motor
• Display unit
• Recycle toner hopper motor : Supplying the recycle toner to the developer material
Recycle toner hopper
Hopper
Recycle
motor
toner
Developer material
JUNE 2002 © TOSHIBA TEC
toner supplied
: Detecting the toner density
: Controlling to keep the developer material toner density constant
: Supplying new toner to the developer material
: Displaying the toner empty status
Control panel
Display unit
Toner cartridge
Toner
New
motor
toner
Control
voltage
signal
Auto-toner sensor
Developer unit
Operation/control section
D/A
converter
IC18
MB88347
Toner density signal
TA8428
IC38
TA8428
IC37
12 - 9 e-STUDIO550/650/810 DEVELOPER UNIT
PWA-SYS
BC-RAM
IC32
GA
CPU
IC27
IC6
PWA-LGC
GA
IC56
LCA301
Main
CPU
IC58
95C063F