2-19
Sub
Assemblies
5) Toner Recycling System
To maximize toner yield, toner cleaned off the drum is returned to the developer
unit to be re-used.
Under normal circumstances the copy process can contaminate the toner. In
addition, other undesirable materials may be cleared from the drum surface
and mixed with re-usable toner (such as paper dust, etc.).
Toner Recycling System allows us to maximize toner yield, while avoiding the
potential side effects of recycling used toner.
<Process>
There are two methods of handling the mixture of materials found in the cleaning
unit following the drum cleaning.
This handling is normally in the "Recycle" mode, but on a regular basis is
switched to the "Refresh" mode. During the "Refresh" mode, the undesirable
particles are removed from the developer unit, and forwarded to the waste
toner bottle to be discarded.
<Control>
Approximately every * 2,000 copies (FP-D250/D350 Series)/500 copies (FP-
D450/D600) the toner recycle system activates the toner recycle solenoid
switching the machine from the recycle mode to the refresh mode.
The machine will remain the refresh mode for the next 300 copies (FP-D250/
D350 Series)/200 copies (FP-D450/D600), during which time the contaminated
toner is emptied into the toner waste bottle.
This process removes undesirable particles from the system and it is completely
unnoticed by the end user.
* The amount of copies between cycles is programmable through
F5-65
.
Additionally if the TDC ratio becomes too high the system initiates refresh mode
automatically.
Recycle Mode
Developer
unit
Waste toner
bottle
Drum
Cleaning
unit
Cleaning
unit
Developer
unit
Drum
Refresh Mode
