Drum Charging - Minolta EP3010 Manual

1173SBM1000A
10

DRUM CHARGING

The PC Drum Charge Corona has a Scorotron grid to deposit a negative DC charge evenly
across the surface of the PC Drum. The grid voltage (VG) applied to the grid mesh is
selected between –550V (initial value, variable according to image stabilization controls) in
the normal mode and the value in the normal mode +90V in the Photo mode by the Con-
stant-Voltage Circuit in the High Voltage Unit.
The Corona Unit has a Comb Electrode which minimizes the amount of ozone produced.
The conventional wire type corona unit produces a large amount of ozone due to corona
discharge in radial directions. The comb electrode type, on the other hand, discharges only
toward the Grid Mesh, meaning a reduced amount of ozone is produced.
The Comb Electrode can be cleaned by the user who pulls out to the front the shaft on
which a Cleaning Roller is mounted.
Holder
PC Drum
PWB-A PJ27A-2
Charge Corona
Grid Voltage
PWB-A PJ27A-1
(VG)
Comb Electrode
Control Signal
Control Signal
M-20
Spring
Grid Mesh
ON OFF
L H
Normal
Photo Mode
Mode
Pulse output
Holder
1139M030AA
1173T08MCB
WIRING DIAGRAM
1-F
WIRING DIAGRAM
1-F