Ricoh G091, Service Manual

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