Toner Density Control - Ricoh G176 Service Manual

Printing Process

Toner Density Control

More toner is fed when the
toner coating on the
development roller is thin
[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.
G176/G177/G176L
Less toner is fed when the toner
coating on the development roller
is thick
6-12 SM