Developing Assembly - Canon imageRUNNER 1750 Series Service Manual

2
Technical Explanation > Image Formation System > Controls > Developing Assembly

■ Developing Assembly

The Developing Assembly mainly consists of the Developing Cylinder, Developing Blade,
Toner Stirring Plate, and Toner Feed Screw, and is driven by the Main Motor (M2) and Sleeve
Clutch (CL2).
The Toner Feed Screw and Toner Stirring Plate feed the toner, which was sent from the Toner
Container, to fill in the Developing Assembly. Toner in the Developing Assembly is detected
by the Developing Assembly Toner Sensor (TS2), which is a magnetic sensor.
Toner Agitation Plate
Toner Feed Screw
TS2
CL 2
M 2
[3] [2]
DC Controller PCB
TS2 Developing Assembly Toner Sensor
CL2 Sleeve Clutch
M2 Main Motor
[1] Sleeve Clutch drive signal
[2] Main Motor drive signal
[3] Developing Assembly Toner Sensor detection signal
2 Technical Explanation > Image Formation System > Controls > Developing Assembly
Developing Blade
Developing Cylinder
[1]
F-2-70
● Developing Bias Control
DC bias and AC bias are applied to the Developing Cylinder.
Density Setting
Main Controller PCB
Environment sensor
HVT PCB
[3] [2] [1]
Developing AC bias
control circuit
DC Controller PCB
[1] Developing bias control signal
[2] Environment sensor detection signal
[3] Density setting signal
● DC/AC bias constant voltage control
The DC bias control circuit and AC bias control circuit in the DC Controller PCB control DC
bias and AC bias, which are applied to the Developing Cylinder, to make constant voltage.
● DC bias switch control
DC bias changes output value of DC bias according to the environment and density settings
detected by the Environment Sensor (THU1).
2-45
Photosensitive drum
Developing cylinder
Developing DC bias
control circuit
F-2-71
2-45