Ricoh G148, Service Manual

Page: 466 / 537

Development power pack [A] applies –550V through terminal [B] to the shaft [C] of the development roller
[D]. Bias is also applied to the lower casing to prevent toner from being attracted back from the drum.
Toner Supply
The ID sensor and TD sensor control toner density. The output of these two sensors determines when to
switch the toner supply clutch [A] on. The clutch transfers drive from the development motor to the toner
supply mechanism.
When the toner supply clutch turns on, the agitator [B] mixes the toner in the hopper and sends it to the
toner supply roller [C].
Toner is caught in the grooves in the toner supply roller. Then, as the grooves turn past the opening, the
toner falls into the development unit.
Development and Toner Supply
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