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Inside the toner unit, there is a stirring device to broadcast toner over full width of drum. I will guess this is the culprit, the stirring device is not turning. Try this test: remove the toner cartridge and shake it rapidly back and forth. Then try a print, any change?
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Needs Drum If you pull the drum unit out you will see on the drum different shades of color lighter is wear the lines come from. Buy a rebuilt drum much cheaper and they work, may have to reset the drum count if the change drum lite on...
I also had this problem with faded print down the left hand side. I decided to strip the printer down. I had to completely remove the laser imaging unit which meant removing all the covers and a couple of circuit boards. I then cleaned the lenses/mirrors inside the open front and laser head (behind a flap with laser warning sticker) with compressed air. This cured the problem but took a couple of hours. I wouldn't recommend doing this unless you are reasonable competent with electro mechanical devices.
Having seen the laser imaging unit out of the printer, it seems a real shame that it wasn't manufactured to be air/toner tight as this could have been achieved at a small cost.
I hope this is helpful ;)
It sounds like the develop blade on your imaging unit needs to be cleaned. If you either clean it or buy a new one. If you are interested in cleaning it yourself I can send you a document on how to do this.