Ricoh LD013, Service Manual

Page: 234 / 513

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DEVELOPMENT
SM 6-41 B039/B040/B043
6.9.4 DEVELOPMENT BIAS
This machine uses a negative-positive development system, in which black areas
of the latent image are at a low negative charge (about –154
±
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.
B039D303.WMF
[A]
[B]