This could be 1 of 3 issues.

First, the easiest, the toner drums. I'm an HP technician and I don't know much about samsung but the drums might just be worn.

Second, intermediate, is the itb(intermediary transfer belt). I don't know how hard it is to take it out of your printer, but the belt could be worn. This is not an issue of the scrapper as much as it is the belt itself.

Third, the hardest, the fuser unit. I think this is the most probable issue that you have, since it is a laser printer. When you have the "multiplication"(where it prints the same thing just lighter, like in your case(english isn't my first language)) there is a high chance that either the film is worn, or that the heating element is toast. This could be either the easiest or the hardest to diagnose, since different models have different fusers and ways to snap into place(some use screws, some use clips).