- Make a copy by using the platen mode and ADF.
- Send a print from your PC or print out the Counter list from User tools/counter button.
- Try printing one colour at a time - Black, Cyan, Yellow or Magenta.
If when printing, there is no line across the pages, so you need to clean the optics mirrors and exposure glass.
If the line appears in both 1 and 2 mentioned above, you have the fuser roller or drum damaged.
If the line appears in all colour prints, check the fuser or transfer belt.
If it happens only with one particular colour, check that drum unit.
Good luck and please rate me, thanks.
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