Toner Density Control; Development Bias - Ricoh G112 Service Manual

PRINTING PROCESS

Toner Density Control

[B]
More toner is fed when the toner
coating on the development roller
[A]: Pre-doctor blade
[B]: Doctor blade
[C]: Circulation of developer
A mixture of toner and developer circulates at the pre-doctor blade [A].
When the toner on the development roller decreases, the circulating region [C] gets
smaller to let more toner get to the development roller.
When the toner on the development roller increases, the circulating region [C] gets
bigger to let less toner get to the development roller.

Development Bias

GND
-140V
-700V
-900V
Toner transfers from the development roller to the areas on the drum that were
exposed to the laser.
G112/G113/G116/G094/G095/G091
[A]
[C]
G094D533.WMF
Print Data: White
6-16
[B]
Less toner is fed when the toner
coating on the development roller
Black Toner
Laser Exposed Area
Developmemt Roller
Drum Surface Voltage
G094D535.WMF
[A]
[C]
G094D534.WMF
SM