15 February 2006 DRUM UNIT
6-57
Detailed
Descriptions
6.8.8 DRUM VENTILATION AND OZONE FILTER
Cooling prevents uneven buildup of negative ions which can lead to uneven charge
on the drum surface.
The drum cooling fan [A] draws cool air into the machine and sends it over the
charge corona unit [B] and down through the vents in the ends of the drum [C].
The PCU cooling fan [D] cools the drum and charge corona unit from the other end.
The dust filter [E] above the charge corona unit absorbs ozone in the air coming
from around the drum.
The exhaust fan [F] vents the hot filtered air from inside the machine.
Fan Operation Timing
Drum cooling fan Turns on and off at the same time the polygon motor
PCU cooling fan Stays on when the fusing lamp temperature is being controlled (at all
times except in auto off or night mode).
Exhaust fan Switches on after the main power switch is turned on, and remains on.
However, to reduce noise and conserve energy, this fan turns slower
when the drum motor is off.
B246D915.WMF
[A]
[B]
[C]
[D]
[E]
[F]
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