The black text was acting strangely - every other line, roughly, was wavy, smudged. I've replaced the cartridge, but now there's absolutely nothing happening at all. When I do a maintenance check, the coloured bars aqre fine, but there is no grid of fine black lines.
In fact, I ran a couple more ordinary cleaning sequences with a new cartridge in place, and it prints normally now. The only anomaly is that the ink-level panel still shows the 3eBK as being half-full (which is the level it showed when I discarded the previous cartridge).
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pull out the black cartridge then get a tissue paper try pressing the nozzle again the tissue paper but not so hard then release look for the straight line that appear on the tissue paper if it is not change it
Hello sir;The streak line from printing also should be from copy, because the line come from imaging unit, check the meter count if close to or over 50,000 then replace drum and drum blade, it will take care the problem.
The brother printer you need to replace imaging unit( drum unit).
That black dust that fell out is the toner. When you shake a toner cartridge that shouldn't happen. It looks like you have a faulty toner cartidge and that need to be replaced!
Now to make your printer prints cleanly and clearly after you replace the cartridge, you'll need to get someone to service the printer(the faulty toner cartridge more than likely spilled toner on your internal printer parts, cause the smudges). Sevicing would mainly entail, taking down the printer and removing any spilt toner!
If you feel you are up to this, be cautious, because toner can be hazardous to your health if you accidentally breathe it in!
hope this was helpful!