- The transfer unit is a moving part of the laser printer and therefore prone to problems and eventually wear out. Transferring of images requires precise movement of the transfer rollers and transfer belt for the toner. They must be correctly aligned so the image on the paper is accurately placed.
- The transfer unit is part of the laser printer mechanism wherein the image is impressed on the paper before the fusing process. It is found beyond the photosensitive drum and before the fuser assembly. Like most part of the printer, the transferring process also involves passing through the different parts of the unit. After the developing of image on the photosensitive the drum, the paper then passes through two rollers (upper and lower). The lower roller is charged with electrostatic attracting the toner to stick to the paper from behind to form the image. The rollers finally imprints the image on the paper while at the same time clean up excess or loose toner and deposits it in the toner waste hopper.