I opened my printer to change the drum unit and I noticed a lot of black powder on top of the toner and the drum unit.
- Is this normal?
- Does this mean the drum unit/toner is bad?
- Should I just change both of them or can I just change one?
- If I change one, say just the toner, but the drum unit is bad - will it damage the new toner cartridge - and vice versa?
I cleaned the dust powder (which I guess is toner) off, but the printer still prints dirty.
Edit 1: All of this stems from this question - Can a generic drum unit cause a Brother HL-2170w Laser B&W printer print dirty?