Drum Charging - Minolta Di 620 Manual

1155SBM0700A

DRUM CHARGING

7
A scorotron charger system generates a negative DC corona discharge onto the drum
surface. A grid mesh provides uniform charging.
The grid voltage (VG) applied to the grid mesh is controlled by the constant voltage
circuitry within the Drum Charge High Voltage Unit (HV1).
In order to restrict ozone production, the copier utilizes two comb electrode chargers
to generate the charge. Whereas wire type chargers produce circular coronas that
can generate significant ozone on all sides, the comb electrode charger concentrates
the discharge onto the grid mesh, thereby reducing ozone generation.
Holder
PC Drum Drive Motor
PC Drum Charger
Developing Unit Drive
Motor (M1)
CONTROL SIGNAL
HV1 PC
Drum Charger
INITIAL VALUE
CONTROL SIGNAL
-614V
Grid Voltage
(VG)
NOTE Will vary in accordance with image stabilizing control.
Comb Electrode
ON
(M2) OFF
200msec.
ON
OFF
950msec.
ON
OFF
PJ9A-2A
PJ9A-12A
Spring
Grid Mesh
ON
L
WIRING DIAGRAM
M-16
Holder
920msec.
1155T21MCB
OFF WIRING DIAGRAM
H F~G-8~9
F-8