31 March, 1999
MECHANICAL OVERVIEW
1-9
Overall
Information
1.2.5 TRANSFER BIAS VOLTAGES
Primary transfer (from OPC belt to transfer belt)
An 800-V bias voltage (TB) is applied to the bias roller. This attracts the toner from
the OPC belt.
Secondary transfer (from transfer belt to paper)
A co16
µ
A current (TC) is supplied to the paper transfer roller (at about 1.8
kV) to attract the toner from the transfer belt.
The machine adjusts the transfer current automatically for variations in
temperature, humidity, paper size, and paper thickness.
After a paper jam has occurred, the paper transfer roller must be cleaned. Positive
and negative currents are supplied alternately to repel any particles that got stuck
on the roller as a result of the paper jam.
G024V664.WMF
Paper
Paper transfer roller
TC– = –16
µ
A
(About –1.1 kV)
Transfer belt
Toner
OPC belt
Bias roller
TC+ = +16
µ
A
(About +1.8 kV)
TB = 800 V
