Oki OKIFAX 5750 Maintenance Manual page 514

5) Transfer
The transfer roller is composed of conductive sponge material and is designed to make
the EP (image) drum surface and the paper closely into contact.
Paper is placed over the EP (image) drum surface, and a positive charge, opposite in
polarity to the toner, is applied to the paper from its reverse side.
The application of a high positive voltage (+1.5 KVDC) from the Power Supply Unit (H10
board) to the transfer roller causes the positive charge induced on the transfer roller
surface to be transferred to the paper at the contact between the transfer roller and the
paper. As a result, toner charged negative that is attracted to the EP (image) drum
surface is transferred to the upper side of the paper by the positive charge on the lower
side of the paper.
EP drum
Paper
Transfer roller
Power
supply unit
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41285901TH Rev.3