Development Bias; Correction For Paper Width And Thickness (By-Pass Tray Only) - Ricoh G179 Service Manual

Development
The outer paddle moves developer to the front 1 and supplies it to the development roller.
Developer that spills off by the doctor blade 2 passes through the holes [C] in the outer
paddle, and is transported to the rear 3 by the inner auger.
While the dual mixing roller is moving the developer, some developer also passes back to
the development unit through the holes in the bottom of the paddle roller 4. New toner from
the toner bottle and recycled toner from the toner collection coil both enter the development
unit at [D].

6.7.4 DEVELOPMENT BIAS

Mechanism
Black areas of the latent image are at a low negative charge (about –150 V) and white
areas are at a high negative charge (about –850 V).
To attract negatively charged toner to the black areas of the latent image on the drum, the
high voltage supply board [A] applies a bias of –560 volts to the development roller
throughout the image development process. The bias is applied to the development roller
shaft [B] through the bias terminal spring [C] and bias terminal [D].
The development bias voltage (-560 V) can be adjusted with SP2201-001 (Development
Bias).

Correction for paper width and thickness (by-pass tray only)

The by-pass tray can be used for non-standard paper narrow than sizes accepted by the
G179
CÓPIA NÃO CONTROLADA
6-24
CÓPIA NÃO CONTROLADA
SM