Ricoh A229 Service Manual page 116

DRUM UNIT
To the Toner Collection
Bottle (Waste Toner)
The toner recycling unit mechanism is controlled by the image pixel count. The
recycling clutch [A] is engaged for 2 seconds after making the equivalent of about
100 copies of a 6% test chart. The air pump also turns on for 6 seconds at the
same interval.
When the recycled toner cannot be transported to the development unit (for
example, if the toner recycling clutch is slipping or toner is clogged in the tube or
the screw pump), the recycling unit [B] starts to fill up with recycled toner
The tower above the recycling unit is divided into two partitions. The right-hand
partition contains toner from the drum cleaning unit, and the left-hand partition
contains toner from the transfer belt cleaning unit.
The wall between the partitions contains agitators [C] that prevent toner from
completely filling the right-hand partition if the recycling mechanism gets clogged
with toner. The agitators move sideways, and any toner that is piled too high
moves into the toner collection tube [D]. This toner is transported to the toner
collection bottle as waste toner.
A229
[D]
To the Toner Supply
Unit (Recycled
Toner)
[C]
2-62
[B]
A229D629.WMF
SM
[A]