IBM 1800409-001A - Manual (Page 390)

1. A precharger unit puts an even charge across the OPC
(Organic Photoconductor) belt. Think of it as preparing a
surface for painting.
2. When you send an image file, the QMS controller uses that
information to control when the laser beam in the optical unit
turns on and off as it scans the OPC belt. When the beam is
on, it discharges sections of the belt forming an image.
3. Next, the belt passes under the developer/toner unit, which
opens, and toner is electrically attracted to the discharged
areas. (In color printing, each color is individually applied
during a separate pass of the belt: yellow first, followed by
magenta, cyan, and black.)
4. The belt carries the toner image to the transfer drum, where a
slightly stronger charge attracts and stores the toner until all
colors are processed. Once the full image is collected, the
drum turns toward the transfer roller, which has an even
stronger attracting charge. However, just before the toner can
switch to the transfer roller, media passes between the drum
and roller, so the toner lands on the media instead.
5. Rollers pull the media up through the fuser unit, where heat
and pressure set the toner, and the final copy comes out into
the top cover.
Appendix D
D - 2 A d d i t i o n a l T e c h n i c a l I n f o r m a t i o n