Development Bias - Ricoh G035 Service Manual

DEVELOPMENT

2.5.4 DEVELOPMENT BIAS

[D]
[A]
[B]
[C]
G035D404.WMF
This machine uses a negative-positive development system, in which black areas
of the latent image are at a low negative charge (about –150 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 [A] applies a bias of -600 volts to the
development roller throughout the image development process. The bias is applied
to the development roller shaft [B] through the bias terminal spring [C] and bias
terminal [D].
The development bias voltage (–600 V) can be adjusted with SP2-8.
Correction for Paper Width and Thickness (By-pass Tray Only)
The by-pass tray can feed narrow, thick and special paper types (OHPs) that the
standard paper tray can not. If you use the standard tray with these special types
of paper, some print quality problems may occur.
To deal with this, the charge roller receives a higher voltage for when using paper
fed from the by-pass tray. Adjust the voltage with SP2-13-3 and 4.
Development bias voltages
Paper width from 216 mm to 297 mm: SP2-5-1
Paper width from 150 mm to 216 mm: SP2-5-1 + 50 V (adj. with SP2-13-4)
Paper width below 150 mm: SP2-5-1 + 200 V (adj. with SP2-13-3)
Similar voltage adjustments are available for charge roller input voltage and
transfer current.
SM 2-25 G035