B245/B276/B277/B268/B269 Service Manual 18-Jan-06
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front of the machine. Mixing auger 1 [B] returns the excess developer, along with new toner,
to the rear of the mixing assembly. Here the developer is reapplied to the development roller.
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 SP 2201 1.
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