Auto-Toner Sensor Circuit - Toshiba 1550 Service Manual

10.5 Auto-Toner Sensor Circuit

Brief description
• Functions of auto-toner circuit:
• Detects density of toner in developer material.
~ Density drops toner supply
• Detects that toner in toner cartridge has been used up (toner empty).
• Configuration of auto-toner circuit
• Auto-sensor:
• Control section: Control to maintain toner in developer at a constant specific density.
• Toner motor:
• Display unit:
Display unit
Toner
Toner motor
Toner sensor
Developer material
Mar. 1998 © TOSHIBA
Detects toner density.
Replenishes the toner in the developer unit.
Displays toner-empty status.
Toner cartridge
Control voltage signal
Toner density
signal
Developer
unit
R114
5
7
+
DA converter
6
IC2:M62
353FP
R113
(A01)
13
R115
14
12
IC1
+5V
2
2
1
Q19
3
DG
10 - 11
Arithmetic and control
unit PWA-LGC
MAIN
CPU
IC10:
96C141
AFZ
IC12
R127
R126
D12
nV-RAM
IC9
1
Q20
3
PWA-F-LGC
1550/1560 DEVELOPER