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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.
TS1
Developing unit toner sensor
CL3
Developing cylinder clutch
M1
Main motor
[1]
Developing cylinder clutch drive signal
[2]
Main motor drive signal
[3]
Developing unit toner sensor detection signal
Developing Bias Control
The DC bias and AC bias are applied to the developing cylinder.
[1]
Developing bias control signal
[2]
Environment sensor detection signal
[3]
Density setting signal
Constant voltage control of DC bias and AC bias
The DC bias and AC bias control circuits on the DC controller PCB control the DC bias and AC bias applied to the developing cylinder to keep their voltage at the fixed level.
DC bias switch control
The DC bias output varies according to the environment or density setting detected by the environment sensor (HU1).