Specifications

EPL-5700 Chapter2 Operating Principles
Rev. A
2-
8
2.1.6.2 Cleaning OPC drum
Toner which is not transferred to the paper because of paper jam or paper
size error needs to be cleaned since it remains on the OPC drum and
makes its surface dirty. Cleaning sequence is as follows.
1. Although toner on the OPC drum is collected by the rotation brush, since
it is accumulated on the surface, toner which is charged plus is changed
to minus by charging bias -1280VDC to the rotation brush. At this time,
reversed bias(-1KV) is charged to the transfer roller.
2. Toner moves down to the OPC drum side whose electric potential is low,
and is collected in the development part.
It goes to this cleaning at the idling state when the cover is closed after the
paper jam is cleared. Also, it goes to this cleaning sequence at the size
error.
15msec 10msec
-1286V
-336V
Drum Cartrid
g
e
Rotation Brush
Laser Exposure
Developin
g
Sleeve Roller
Drum Cover
Transfer Roller
OPC Drum
Paper Powder
Cleaner
Surface abrasive
Pre-char
g
in
g
film
1280 DVC
Figure 2-9. Charging Mechanism