Development Bias; Cópia Não Controlada; Mechanism; Correction For Paper Width And Thickness (By-Pass Tray Only) - Ricoh G065 Service Manual

6.1.4 DEVELOPMENT BIAS

Mechanism

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 –540 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 (–540 V)
can be adjusted with SP2201 (Development Bias).

Correction for Paper Width and Thickness (By-pass Tray only)

The by-pass tray can be used for non-standard paper narrow than sizes accepted
by the paper trays. Thicker paper, OHP sheets, etc. can also be loaded in the by-
pass tray but adjustments must be performed with the SP modes listed below in
order to avoid jams and misfeeds.
SP Mode
SP2201-01 Development Bias
SP2309-01 Paper Lower Width [a]
SP2309-02 Paper Upper Width [b]
SP2914-03
Process Control Setting (Bγ)
SP2914-04
Process Control Setting (Bδ)
The way that these SP modes are used is shown below.
0 mm
Voltage:
SP2201-01 + SP2914-03
Default: –540 + 200
For example, with the default settings, if the paper width fed from the by-pass tray
is 200 mm, the development bias voltage will be –540 + 50 V.
G065
CÓPIA NÃO CONTROLADA
SP Name
SP2309-01
Default: 150 mm
SP2201-01 + SP2914-04
Default: –540 + 50
6-24
CÓPIA NÃO CONTROLADA
[D]
[B]
Default: -540 V
Width limit. Default: 150 mm
Width limit. Default: 216 mm
Adjust 10 V/step. Default 210 V
Adjust 10 V/step. Default 50 V
SP2309-02
Default: 216 mm
Voltage:
DEVELOPMENT
[A]
[C]
G065D404.WMF
297 mm
Voltage:
SP2201-01
Default: –540
SM