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June 30, 1998
DRUM UNIT
Charge Corona Wire Cleaning Mechanism
[A]
[A]
[C]
[B]
A229D558.WMF
Air flowing around the charge corona wire may deposit toner particles on the
corona wires. These particles may interfere with charging and cause low density
bands on copies.
The wire cleaner pads [A] automatically clean the wires to prevent such a problem.
The wire cleaner is driven by a dc motor [B]. Normally the wire cleaner [C] is
located at the front end (this is the home position). Just after the main switch is
turned on, the wire cleaner motor turns on to bring the wire cleaner to the rear and
then back to the home position. When the wire cleaner moves from the rear to the
home position (black arrow in the illustration), the wire cleaner pads clean the
wires. This is only done when 5000 or more copies have been made since the
wires were cleaned last, but only if the fusing temperature is less than 100 °C
2-57
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