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15 July 1996
DRUM UNIT
2.3.2 Air Flow Around the Drum
[A]
[C]
[B]
A176D520.wmf
The exhaust fan [A] located above the fusing unit provides an air flow to the
charge corona unit to prevent uneven built-up of negative ions that can cause
an uneven charge of the drum surface as shown.
An ozone filter [B] absorbs the ozone (O
) around the drum.
3
The exhaust fan rotates slowly during stand-by and rotates quickly during
copying to keep the temperature inside the machine constant.
70 CPM machine has another fan (drum cooling fan), which is located at the
right rear side of machine (front view). The drum cooling fan cools the drum
unit to remove the heat from the duplex tray. To prevent foreign matters from
entering the copier inside, a dust protection filter is installed in the entrance
[C] of the duct.
2-21
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