Oki MB280 Service Manual

Also see for MB280: User guide Quick start guide

Oki MB280 Service Manual Manual pdf 12 page image

PRINTER 3000 304 995 - 01iPRINTER MODEL-L1G191SERVICE MANUALTECHNICAL DOCUMENT6 September 2005 !1-9DetailedDescriptions1.2.5 TRANSFER AND SEPARATIONOverviewThis machine uses a transfer roller [A], which touches the OPC drum [B] surface. Aconstant current 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 dropaway from the drum.Cleaning ModeIf a paper jam occurs during printing, toner may be transferred to the transfer rollersurface. To prevent this toner from transferring to the underside of the paper, thetransfer roller must be cleaned before the next printing run.While the machine is in the cleaning mode, the Power Supply Unit board applies anegative voltage to the transfer roller.The negatively charged toner on the transfer roller is then transferred back to thedrum.The machine goes through the cleaning mode at the following times.• At power-up: The process starts when the fusing temperature reaches thestandby temperature.• When the cover is opened and then closed during the printing process.• After a printer jam has been cleared.G182D104.WMF[A][B][C][D][E]