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can you explain more the functions of each are as followed fuser melts the toner to the paper so it dosnt rub off ozone filter filters out the ozone so you don't get headaches and turn al the rollers to bubble gum transfer roller pushes the paper onto the transfer belt applying the image to the paper and imagine unit is where thetransfer belt gets the image from
OPCBelt (Organic Photo Conductor) A photoconductor is a material that conducts electricity only when exposed to light. Photocopiers and laser printers have a large roller or belt coated with photoconductive material. As this drum turns it is electrically charged by a high voltage
corona wire. The next step is to reflect an image using a laser beam or
reflected light from mirrors onto the drum as it turns neutralizing the
charge where light hits leaving a latent image or static charge in the shape of the image you want to copy.
The next step is to turn the roller past a brush made of toner (colored
plastic particles). The static charge will pull the particles onto the
charged area of the drum forming an image you can see, next feed a piece
of paper onto this turning drum, as you do apply an opposite charge
using a second high voltage wire
(transfer corona) to the back side of the paper, causing the paper to
stick to the toner/drum (opposite charges attract). Separate the paper
from the drum using a high voltage alternating current (separation
corona wire). Melt the toner into the paper with hot rollers. This will create a black and white image.
the transfer roller is a foam roller that transfers the toner onto the paper. It will be visible with toner removed, a little wider than a piece of paper, and about the thickness of a roll of quarters. I don't know how to physically remove it on your model, but transfer roller issues in general can be remedied by removing the transfer roller and wrapping it in packing tape until the tape comes off clean.
While you're in there, vacuum everything out for good measure; but never, ever use canned air on a laser printer.
As I understand it from servicing laser printers, the toner is actually drawn statically to the paper from the drum by a charge on the belt. Toner is not supposed to be distributed to the belt. The fuser fuses the toner to the paper after the transfer. Can you access the fuser rollers to see if there is any sign of wear or damage they may be keeping the paper from entering it properly? The toner on the belt is probably excess from the paper not being pulled through and having the toner fused properly.
vacuum out the waste toner passages that lead from the drum and transfer belt to the waste toner container. Toner is building up inside the transfer belt and/or drum and has no place to go except onto your paper.
Transfer Belt - these can fail suddenly and dramatically, often quite soon after their rated life is reached.
Also check Transfer Roller (open the duplexer door to see this - grey (black when new) foam roller about 25mm diameter purple plastic tabs on ends (1 may be black). This is critical to good quality prints, as it maintains the contact between paper and Transfer Belt AND electrostatically pulls the toner off the Transfer Belt onto the paper.
I developed a color print that has all 4 principal pure toner colors in vertical and horizontal bars that are at least 2" wide. If perhaps you are having a toner problem only one of the colors will be affected. If all colors are affected there are two possible issues. The drum, which I think is actually a belt, and the other the fuser assembly.
The fuser is a heater and pressure roller system that presses and melts toner onto a page. The drum is an imaging device that picks up toner where images should be and transfers toner onto a piece of paper. Any toner not transfered from the drum / belt is destined for a waste toner hopper. If the belt is not being cleaned properly or has an image or flaw artifact that cannot be cleaned / erased you always get that printed on a page.