Transfer Current - Ricoh B202 Service Manual

6.11.3 TRANSFER CURRENT

[F]
The transfer roller [D] applies a current to transfer the toner to the paper on the
transfer belt [A]. The high voltage supply board supplies current to the transfer
roller and the paper attraction roller [C].
These currents are automatically corrected for paper size, temperature (measured
by the thermistor on the right side of the laser optics housing unit), and humidity
(measured by the humidity sensor).
The following adjustments are shown below:
• You can adjust the transfer roller current for each printing mode (color or B/W,
resolution, paper type) with SP2-301-1 to -99. The by-pass tray settings are used
when the duplex unit has not been installed and the user is making duplex prints
manually from the by-pass tray. There is a correction for narrow-width paper with
SP2-309-5 to -11.
• You can adjust the current for paper attraction with SP2-801-1 to -37.
The back-up roller [E] makes a wider contact area between the drum [B] and the
belt. The transfer exit roller [F] is charged to 2 kV. The roller prevents the toner
from being scattered while the paper is leaving the transfer unit.
The other rollers are grounded to neutralize the belt surface.
SM
IMAGE TRANSFER AND PAPER SEPARATION
[E]
[D]
6-85
[A]
[B]
B178D578.WMF
B202/B178/B180
[C]