Theory of Operation Ver. 8.0 Jun. 2008
11. Charge Corona section
4
7
Composition/Operation
11.1 Operation
11.1.1
PC drum charge corona ON/OFF control
• The grid voltage (Vg) applied to the grid mesh is controlled through the image stabiliza-
tion control.
11.1.2
Charge corona cleaning control
• A dirtied PC drum charge corona may cause bands or uneven image problems and the
increase of the electric potential on the surface of the PC drum. To prevent those prob-
lems, the charge corona has a cleaning mechanism that periodically cleans the needle
electrode and the grid mesh.
• The cleaner is driven by the charge cleaning motor/K.
• When the power switch is turned ON or the front door is opened/closed, the charge
corona cleaner home position is detected.
• The charging cleaner home sensor detects the position (rear) of the charge corona
cleaner. The charging cleaner return sensor (this side) detects the return position.
• Only IU/K has this cleaning control system as the IU/K operates longer hours than the
other IUs.
• IU/Y, M, C needs to be cleaned by hand with the cleaning jig attached to each IU.
K PC drum motor (M18)
Color PC drum motor (M16)
Drum charge corona bias/
Y,M,C
Drum charge corona bias/K
K PC developing motor (M19)
Color developing motor (M17)
Charge corona
(Mounted separately
for each of Y, M,
C, and K)
A00JT2E512DA
A00JT2C035DA
Charging cleaner
return sensor (PS44)
Charge cleaning
motor/K (M15)
Charging cleaner
home sensor
(PS43)
cleaner
Y107522-3 Theory of Operation
