Multi colored bar of lines printing down one side edge of paper

[mcilia]

My printer has started printing an approximately 1/2" edge of multi colored lines that change colors as you go down the page.  It does not do it on every page in a print job and it gets lighter and lighter and more of a black to gray scale as it prints further into the print job and some pages have no edge at all at the end of a job.  It seems random because sometimes the first few pages print fine and then the edge starts in the middle of a print job.  I was going to try and attached a picture of it, but didn't see the ability to atatch a document to the post.  Any ideas how to fix this?

[davidzuts]

Odds are contamination on the transfer belt. This is fairly common on this series as the belt gets older. Two things you need to check. First you need to check on the toner collection bottle in the back of the printer. When it gets near full it prevents some of the excess toner removed from the transfer belt to be moved to the bottle and it accumulates on the transfer belt. Second remove the transfer belt being careful and look for the line of toner at the edges of the belt. What I usually do is move the back back a couple of inches so a complete line of used toner appears and then wipe it down. I use a product called bestine which is available at art supply stores. I then move the belt in the direction it goes when printing and remove any lines that show up on the reverse side. Even though you are not supposed to, if the bottle has a lot of toner you can take a plastic garbage bad, remove the black clip piece and shake most of the toner out and also use the auger thing by the opening to move it so more excess toner comes out. You then put the bottle back in the printer. If when you move the belt in the printing direction the lines comes back, then the wiper blade is bad and belt will need to be replaced. They are pricey.