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You need to remve the copy glass and clean it thoughly.
make sure it has that sticker the glass come with which has the marks for A4,LTR etc.
also the scanner must be in it home position.
but the cardinal thing is for the glass to have it accessory.
Lines on copies can come from the optict area, charge grid and comb or the fusing roller. Stop the copy halfway through the cycle and see where the line starts to appear. If you see it as much as you do the rest of the print, it is either optical or in the drum charge unit.
that is a dirty glass. The 1 inch or less wide glass on the left side of the machine has a very small spec on it.
You can clean it with a regular piece of paper and alcohol. Don't be afraid to clean it with some decent pressure.
The reason why you get the line in the feeder and not off the glass is that when you run a copy off the glass the lamp scans the immage, when you run through the feeeder the lamp parks under the glass and the movement of the document makes the print.
You may have some white out, or just some ink off an original on that piece of glass, but keep that clean.
Most people don't think that small piece of glass has a purpose, but it does. Sometimes the blot on the glass is so small you cant see it, and you need to remove that glass and hold it up with a piece of paper behind it to see the spot. It can be a very very small spot. But that is where your issue is.
dark lines is probably caused by the thin glass of the copier. test by making copy on glass, does it have lines? if no look carefully at the small 1" glass there is probably some ink dots or white out or something on it, clean with alcohol and try.
fish scales uniformly are coming from the fuser, ( where it gets hot as its coming out) check.You already changed drum which was a posssibility.
Also check the toner and see if it is solid black.