KIP 9000 Service Manual page 83

Reference
Very small amount of toner may be remaining on "white image area" (corresponds to -XV
area) of Drum if Drum Cleaning process could not remove the toner completely. Such
unnecessary toner in white image area can be removed surely by the Developer Roller
because of the relationship of potential between Drum and Developer Roller.
-XV [Drum] < -YV [Developer Roller]
So there is no possibility that such unnecessary toner will appear on the print as a black spot.
(Toner removed by Developer Roller is returned to the Developer Unit and reused.)
1. Toner remained on the white image area (-XV) of Drum
2. When the toner contacts on the Developer Roller, it moves from Drum (-XV) to
Developer Roller (-YV) as the potential of Developer Roller is relatively "positive" against
Drum.
3. Developer Roller transports the toner toward the Toner Supply Roller
4. Toner Supply Roller returns the toner to the inside of Developer Unit.
5. Toner is used again for development.
Before Development
(Toner is remaining on the white area.)
Toner
1
-YV
5
4
3-10
-XV
2
3
After Development
(Toner is removed from the white area.)
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