Development Bias - Ricoh B205 Service Manual

DEVELOPMENT

6.9.4 DEVELOPMENT BIAS

[B]
[A]
This machine uses a negative-positive development system, in which black areas
of the latent image are at a low negative charge (about –150 ± 50 V) and white
areas are at a high negative charge (about -950 V).
To attract negatively charged toner to the black areas of the latent image on the
drum, the high voltage supply board applies a bias of -650 volts to the development
rollers throughout the image development process. The bias is applied to the
development roller shaft [A] through the drive shaft [B].
The development bias voltage (-650 V) can be adjusted with SP2-201-1.
SM 6-47 B205/B209/D007/D008