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most likely the OPC (drum) or sometimes called "image drum or transfer belt located in the top draw. this is a consumable that needs replacing after it's life cycle is over. sometimes it will go below or over the life cycle, it all depends on many variables.
I would take out all the consumables, toner, belt and so on and use a dry cloth and small vacuum to clean the inside of the printer, then test it again, but when you have streaks it is usually the transfer belt. other possibilities is the scanner/laser window inside, sometimes it gets toner on the glass.
Remove the toner cartridge. Turn it over and slide open the gate that covers the drum. Do you see streaks on one end of the little colored cylinder? (drum)
If so then the streaks are coming from the cartridge.
90% or better of the time, especially on HP's the print quality issues are coming from the cartridge.
Good Luck and Thank You for using Fixya.
If they are black streaks and they are always in the exact same place, open the cover and clean the skinny little scanning glass. It might be ink or lint. If it's white streaks then it's in the same place but it's dried correction tape or fluid, etc.
A) Black Streaks, Shadows, And Ghosting Adjust the printer's lightness/darkness setting to 2-3 different variables and see if problem disappears.
Look at the fusing assembly - is the roller torn or does it have any black buildup? Use caution!!! It gets HOT!
What I would do is remove all cartridges, wipe the belt w/clean cloth use an air can to clean the machine, check the drum on each cartridge see if there is something, it could be there was a change in Voltage and it burnt the drums. change 1 more toner cartridge to see if that color goes away, if it does then you will know if the drums are the problems.
I've had a problem w gen toners doing the exact same thing, so I had to OEM and it went away. Good luck>
You could remove the color and black&white drum units and check from below the units to visually observe lines on all the 4 drums. If so, you have to change the drum unit/units. Drums occassionally get damaged before life this way due to solid toner particles inside the toner bottle.Always "shake the toners very well" before replacement, and if you print rarely, then remove the toners and do the shaking to prevent clogging due to inactivity.