Development Bias - Gestetner B070 Service Manual

DEVELOPMENT

6.12.5 DEVELOPMENT BIAS

The CBG (Charge Bias Grid) power pack [A] applies the negative development
bias (-550V) to both the lower sleeve roller and upper sleeve roller through the
receptacles [B] and the sleeve roller shafts [C].
The development bias prevents toner from being attracted to the non-image areas
on the drum where there is residual voltage. In addition, the development bias
changes with the image density setting chosen for the copy job by the user.
The development rollers [D] employ fixed shafts that do not rotate. This eliminates
friction on the shafts so they never require lubrication.
B070/B071
CÓPIA NÃO CONTROLADA
[A]
[D]
6-74
CÓPIA NÃO CONTROLADA
[B] [C]
B070D305.WMF
SM