DRUM UNIT
SM 6-67 B234/B235/B236/D101/D102/D103
Detailed
Descriptions
Cleaning the Corona Wires
Charge Corona Unit
Air flowing around the charge corona wire may deposit toner particles on the
corona wires. These particles can 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 at the
front end (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,
the wire cleaner pads swivel, bringing the pads into contact with the wires, and
clean the wires as it moves forward.
Cleaning is executed when:
• The machine is switched on and the fusing temperature is less than 100°C while
auto process control executes.
• Every 24 hours.
• After every 5,000 copies. This can be adjusted with SP2804 002 (Charge Corona
Cleaner Setting – Corona Wire Cleaning Interval).
Pre-Charge Unit
There is no mechanism to clean the pre-charge unit corona wire automatically.
However, the pre-charge unit corona wire can be cleaned manually. After the pre-
charge unit has been removed, its cleaning pad can be pushed to the rear and
front several times to clean the corona wire.
SC312 and SC313 signal a problem with the pre-charge unit. After either SC is
issued, operation halts and the machine must be cycled off and on.
When this occurs, the setting of SP2002 001 is automatically switched from "1"
(On) or “2” (ON) to "0" (Off). The operator can use the machine, but the machine is
B234D558.WMF
[A]
[B]
[C]
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