Xerox Phaser 3100MFP Service Manual page 214

General Procedures and Information
Transfer and Separation
Overview
This machine uses a transfer roller [A], which touches the OPC drum [B] surface. A constant cur-
rent is applied to the transfer roller from the power supply unit 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.
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 underside of the paper, the transfer roller must be
cleaned before the next printing run.
While the machine is in the cleaning mode, the Power Supply Unit board applies a negative volt-
age to the transfer roller.
The negatively charged toner on the transfer roller is then transferred back to the drum.
The machine goes through the cleaning mode at the following times.
• At power-up: The process starts when the fusing temperature reaches the standby tempera-
ture.
• When the cover is opened and then closed during the printing process.
• After a printer jam has been cleared.
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Figure 5
04/08 Phaser 3100 MFP