An area about 1/8th inch to 1/4 inch either doesn't pring or is very light. It goes the entire length of the page. All of the cartridges have just been replaced so that isn't the problem I don't think.
You may simply have some toner dust on the laser lens cover. Take out the bit with the green handle and look inside. There's a glass piece about 4 inches (100 mms) by 1/2 inch (12mm) which easily gets dirty. Carefully wipe with a clean soft cloth.
Probably you got some toner dropping on it when you removed the old cartridges.
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If the streaks are narrow black and run the entire length of the page, replace the soft plastic wiper blade on the drum (and hope the drum is not scratched). Black smudges are related to the toner/developer purity. Replace both.
Contamination in the laser path - 1. Clean the laser path. (Remove the laser/scanner assembly and clean the lens.) 2. Replace the laser/scanner assembly Defective fuser - Replace the fuser assembly. Lack of toner or faulty toner cartridge - Redistribute the toner in the toner cartridge. If the problem continues, replace the toner cartridge. Dirty Corona Wire - Clean the Corona Wire. Defective Drum - Mostly applies to B&W printers. Clean the drum or replace the drum.
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.
You may have a bad toner cartridge, if the cartridge has contaminants in it, it will not put toner on the drum in these areas, Try removing and giving the cartridge a good shake, try installing a new or at least another cartridge to see if the problem is here.
This is probably due to a defective cartridge, Charge Roller or Transfer roller.
Check the cartridge for a band of toner still on the drum.
Check the Charge roller for oil or smudges, this roller should be a lighter color and should be relatively free of toner or marks.
Same as the Transfer Roll, which will be dark, though excess toner should be evident.
A relatively smooth straight line is generally the cartridge.
A rather wavey or broken line is most likely the rollers.
You can however attempt to print a large amount of pages (25-50) in an attempt to clean the parts, however if either part is defective they will need to be replaced and no manner of printing will clean them.
The drum unit may need to have the toner collection blade replaced. not the cleaning blade for the drum but the one below it that catches the toner cleaned off the drum. if this blade is old or damaged it losses its seal to the drum and drops tiny specks of toner onto the page.
Hope this helps...
you have a weak photo drum or dirty corona wire take drum assy out and spray metal grid above drum suface with canned air until free of toner dust(take outside to prevent toner dust from getting on carpet or household ) items.