Are the black marks down both sides of the page and if so what shape are they? Are they a sharp edge black mark or faint feathered mark?
You say the black marks are around the edges of the page, does that mean all 4 edges?
Also is it when you print from your computer or when you copy using the document feeder?
There are 3 possible causes but I need to know the answers to my questions.
The black marks are on the left and right only. The marks on the left are about 1/2 cm of saturated black. On the right it is about 3 cm , the saturation decrease as you move to the centre of the page. It is on both print and copies. Thanks
This sounds very much like it is a faulty drum unit. The drum unit has a round cylinder drum and a black transfer belt. The belt can get damaged or the waste toner area in this unit is spilling out. I suggest replacing the drum unit.
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