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hi this may be the toner roller or supply drum for the toner cartridge . if it scratched or worn it leaves marks on the drum or the roller, which in turn fills with toner and leaves an imprint on the page, you can check these , just remove the toner cartridge and look at the green roller and also look at the black roller, it might be a simple case of changing it or cleaning it....hope this helps
There are 3 parts to the imaging process that could cause your issue. You have the toner (x4), the imaging drum unit (Q3964A) and the fuser unit. If you are getting streaks from all colors, one or more these parts are the issue.
Let's start with the easy stuff:
Open the cover as if you were replacing toner where you can "visually" inspect the toner and imaging drum. Pull the drum out and pull back the "plastic shutter" on the top, this will expose a green drum CAUTION! Too much exposure to light and touching it can cause damage. Just take a quick look trying to see if any of the lines on your page match any marks on the drum. Check the bottom half of the unit as well there should be a white section across the bottom, expect that as well.
Next look at the toner, if you can look at any other color but black it will help you look for the streak marks a lot easeier. If you couldn't see any streaks on the drum on toner cartridges, it's time to look at the fuser unit. Power the machine down and turn it around, unplug it then fold down the blue clips and CAUTION! the fuser heats the toner to the page so if it's been used recently it may be hot. once the clips are down, just pull straight back and look for the streak marks.
When you say "Cleaned the lens" I presume you mean the four LED print heads. Use a spirit to clean them with if the toner dust is hard to remove. I usually just use a finger and wipe the entire length. Make sure there is no foreign item laying on the drum top where the black plastic film is as the led head may not seat properly on it. Clean all the silver high voltage springs down the left side of the printer. They make contact with the drums. If you still have a problem then try printing solid colour blocks ie Yellow, Magenta ,Cyan and Black . This will identify which colour is giving the problem . Change that drum and all should be well.