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The duplication problem can be either the drum or the fuser. Most likely your drum needs to be replaced. If you can measure the distance between the first print and its duplicate I might be able to help more.
try looking at 1 of 2 slate-blue retaining clips that secure the thermal cartridge in place on the side that is NOT printing.
it could be broken.
it will need to removed to see any cracks or breakage.
check for any papaer jam or any dust material blocking the rollers of the printer to move.OFF the printer.and blow air through the blower in whole internal area off the printer.then ON and check.
I have the same problem with my 1950MC. When I examined the blue lever carefully on the right side of the machine I found that the plastic lever was cracked at its thinnest point. Thus when both levers are locked down that one was not holding the print head tightly enough to print that side of the paper. If I held the print head down manually, the copy printed fine. So if you have this problem, check the blue levers for cracks. The levers are easy to remove and should not cost very much. I recommend that you replace both left and right levers. These plastic parts cannot stand up to very much use without cracking.
First try to clean the head:
Open the top cover and print head, Moisen a small piece of soft, lint-free cloth with alchol and keep wiping the edge of the print head...
This could also be caused by excess lubricant on the tonercartridge . Print or feed up to 10 sheets of paper through the printer to eliminate the marks.
If the problem continues please contact Brother Customer Service at 1-800-284-4329 Monday through Friday, 9:00am - 7:00pm EST, excluding holidays.