Ricoh B246 Series Manual page 167

Ozone Filter
PCU Cooling
Fan
Follow the flow of air in from the drum cooling fan, through the drum, and out
through the ozone filter.
There is an ozone filter, because corona units make a lot more ozone than
charge rollers.
The on/off timing of the fans is covered in the service manual.
Cooling prevents uneven drum surface charge.
Drum Ventilation
Exhaust Fan
If ventilation is defective, the charge
on the drum will be uneven, and
outputs will have uneven density.
167
Drum Cooling
Fan
Service manual, section 6.8.8
167