FrameMaker Ver.5.5E(PC) EP3000/EP3010 GENERAL, MECHANICAL/ELECTRICAL
98.06.10
M-20
1173SBM1000A
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.
10
DRUM CHARGING
Control Signal
ON
OFF
WIRING DIAGRAM
PC Drum
Charge Corona
PWB-A PJ27A-2
L
H
1-F
Control Signal
Normal
Mode
Photo Mode
WIRING DIAGRAM
Grid Voltage
(VG)
PWB-A PJ27A-1
Pulse output
1-F
1139M030AA
Comb Electrode
Holder
Holder
Grid Mesh
Spring
1173T08MCB