Development Bias - Gestetner B147 Service Manual

DEVELOPMENT

6.8.4 DEVELOPMENT BIAS

[B]
[A]
B146D930.WMF
The high voltage supply board [A] supplies development bias to the development
roller via the receptacle [B] at the rear of each development unit.
There are both ac and dc bias voltages. The ac bias improves toner transfer to the
drum.
The machine automatically controls the dc bias, if automatic process control is
enabled (i.e., if SP3-125-001 is set to 0). However, if process control is switched off,
(i.e., if SP3-125-001 is set to 1), the dc bias is the value stored in SP2-201-001 to
009 (do not adjust in the field unless advised to do so).
The ac bias cannot be adjusted.
SM 6-61 B147/B149/B190