Development Bias - Ricoh B022 Service Manual

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2.6.4 DEVELOPMENT BIAS

B027D303.WMF

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.