Drum Charging - Minolta EPI 054 User Manual

FrameMaker Ver.5.5(PC) EP1054/EP1085/EP2030 GENERAL, MECHANICAL/ELECTRICAL
98.04.24
1174SBM0700A
7

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 -650V in the normal mode and -520V in the Photo mode by the Constant-
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
Control Signal
PC Drum
PWB-A PJ11A-9A
Charge Corona
Control Signal
Grid Voltage
PWB-A PJ11A-10A
(VG)
Comb Electrode
Spring
Grid Mesh
ON
L
Normal
Photo Mode
Mode
L
M-16
Holder
1139M030AA
1174T20MCA
OFF WIRING DIAGRAM
H 4-C
WIRING DIAGRAM
H 4-C