Hi Len,
Thankyou for explaining you problem to me, it makes life a little easier when you have no hands but are equiped with the facts.
I too would normally think Drum/Toner or Carona but it seems you have covered those, the carona is in the drum but if you switch the drum and the marks dont change then that cant be the issue. Here is a
LINK to the carona cleaning instructions and below I'll past a pic of the carona position.
If a good Brother branded toner doesn't fix it, and you have fitted a new sealed brother original drum and that doesn't fix it, there are only two possible things left, one is the fuser at the rear that melts the toner to the paper but I doubt that one because it usally leaves lumpy marks on paper surface, but you could get a touch and look at the two width of the machine rollers at the rear and see if the coating has come off the teflon roller.
What I think is your issue is there is toner dust on the laser lens, it is a **** 1-2cm wide running width of machine, it resides inside the machine about midway directly above carona slot, get a soft cloth and wipe the lens.
Let me know if the lens clean does the trick, otherwise it must be 2 lots of faulty toner but the image would change or two dirty carona's/worn drums but once again image would at least change.
Make sure you reset the drum counter, heres a
(link) to how
Cheers Steve
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