8. Separation The paper is separated from the transfer drum because of the paper’s elasticity. When duplex printing or overhead transparency (OHT) printing is performed, an AC bias is applied to the transfer charger. In high temperature/high humidity conditions, the AC bias is not applied since excessive charge does not build up in high humidity conditions. The AC bias is applied to the transfer charger to prevent discharge between the paper and the transfer belt, which can disrupt the image. Figure 32. Separation EN Image formation 149