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PRINTING
2.2.5 TRANSFER AND SEPARATION
Overview
[D]
This machine uses a transfer roller [A], which touches the OPC drum [B] surface. A
constant current of +4.3 µA (6.0 µA for envelopes) is applied to the transfer roller
from the mechanical control board [C]. The positively biased transfer roller pulls
negatively charged toner off the drum. The curvature of the drum and the antistatic
brush [D] help the paper [E] to drop away from the drum.
The diameter of transfer roller is 14.6 millimeters.
Cleaning Mode
If a paper jam occurs during printing, toner may be transferred to the transfer roller
surface. To prevent this toner from transferring to the under side of the paper, the
transfer roller has to be cleaned before the next printing run.
While the machine is in the cleaning mode, the mechanical control board applies
-1000 volts to the transfer roller, and charges the drum to -750 volts. The
negatively charged toner on the transfer roller is then transferred back to the drum.
The machine goes through the cleaning mode in the following conditions.
• At power-up: The process starts when the fusing temperature reaches
half of the standby temperature.
• When the cover is opened and then closed during the printing process.
• After a printer jam has been cleared.
[A]
2-14
[B]
G027D512.WMF
[C]
18 May, 1999
[E]
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