Development
SM 6-39 D017/D018/D019/D020
Detailed
Descriptions
doctor blade [D], towards the 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.
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 –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.
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