Developing Unit; Developing Bias Control - Canon imageRUNNER 2525 Series Service Manual

● DC bias switch control
The DC bias output varies according to the environment detected by the environment sensor (HU1).

■ Developing Unit

The developing unit mainly consists of the developing cylinder, developing blade, toner agitation plate, and toner feed screw, and
driven by the main motor (M1) and developing cylinder clutch (CL3).
The toner supplied from the toner cartridge is fed into the drum unit by the toner feed screw and toner agitation plate. The toner
presence/absence in the drum unit is detected by the developing unit toner sensor (TS1) which is a magnetic permeability sensor.
No.
TS1 Developing unit toner sensor
CL3 Developing cylinder clutch
M1 Main motor
● Developing Bias Control
The DC bias and AC bias are applied to the developing cylinder.
Toner agitation plate
Developing Blade
TS1
CL 3
M 1
[3] [2]
DC Controller PCB
Part name
Toner feed screw
Developing cylinder
[1]
No.
[1] Developing cylinder clutch drive signal
[2] Main motor drive signal
[3] Developing unit toner sensor detection signal
58
2. Technical Explanation
Part name