Horizontal streaking in MFP477

[georgefe]

I have an HP MFP M477FDW and every since the beginning it has created these black streaks during printing.  Does anyone know how I can fix this?  I am willing to take apart a piece to clean or inspect it.  I have done the cleaning page several times but it does not fix this issue. 

Note that it only shows up on the page that is printed.  If you print a document duplex, it shows up on both sides.

Picture of the streaking below:

[Valsimot]

What is the distance between 2 streaks?

If the distance is 22,6 mm ( 0,89in) or 23,6mm (0,93in) then it is the black toner defective and needs replacement, can't be cleaned. You might try to get your toner for a warranty replacement.

[georgefe]

It does appear that its a little less than 1" on the repetition.  So I just need a new black toner?  Does HP ever replace them even after the initial warranty period is up?

[Valsimot]

The new black will fix you print quality.  You can try to return it if you will be very persistent you might get a new toner.  HP support should know how to handle defective toner when you mentioned printer model and repetitive defect on a printout.

[Repairatrooper]

The warranty on an HP toner is until low is reached on the supply level. If a cartridge fails before that, regardless of time (within reason) HP should replace that cartridge for you.