Ricoh FT6645 Manual page 46

23 April 1993 DRUM UNIT
2.3.2 Air Flow Around the Drum
[A]
[B]
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.
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