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if you can clean the black line with a cloth, than you need just to replace the cleaning blade, but if the black line is not removing without a cloth, then you need to replace the opc drum and the cleaning blade or both blades, some machines of this type have only one cleaning blade but some have two cleaning blade.
Dear. first change the drum cleaning blade and clean the waste toner from the drum unit safely and then try to copy if the black lines still appears then change the drum then it must solve the issue , If still the problem comes then check the laser unit if there is anything which produce the black lines on the pages.
Black lines on copy come from toner cartridge, or drum unit, or fuser unit which is in the back. check drum and see if you can see line, back of machine with flash light you may be able to see line on fuser roller. Be carefull Fuser is hot.
A copy that is good and then starts to get lines usually the drum unit...
Open front cover, you will see yellow knob, pull it down and pullout. Wipe the side with mesh with clean cloth and insert back. That's the main charge unit. Pull the green lever to the left and pullout the transfer charger . Wipe the two wires carefully not to break them and insert back.
Do not try to remove the drum if you have no skills otherwise this should solve your problem.
sounds like the charge grid is not set properly in the drum unit..did you et up the drum unit properly and run the new dev and drum set up..if youy are getting black the charge is not working correct as the charge of the drum help to keep the toner from adhering to the drum surface when copying .. I would take the drum chrge unit out again and check it is set in the right way when you put it back on also check the contacts arent put out of line.
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).
send a print / copy through the machine stop the machine via the main switch before toe paper has come out remove the drum unit
you should now be able to see part of your print on the drum if you can also see the black line check for obstructions in the light path if these seem fine the chances are the dev or cleaner blade seals have spung a leak ( time to replace the drum cartridge
This is that the black drum unit cleaning blade failed or the charge roller has toner stuck on it. To remove the drum open the front cover and using the green tool right hand side of opened door undo the two screws turn the transfer lock into the unlock position and lift. Once you have done this then remove the black drum this is the one at the top by moving the little green tag to one side and pulling out (Be Careful as if you scratch the drum you will have other problems)
Once remove you will be able to see the drum and a black roller above it see if that has the black line on it. If it has then clean with some alcohol based cleaning fluid once this is done reinstall and then print. If there is no line on the black roller try above the likely thing is that the drum cleaning blade has worn and the unit will need replacing.
If you see black lines on the drum, it is very likely that the drum unit is bad. Replace the drum unit and rest the drum counter. If you wait too long, you will cause toner build up in the fuser and will cost yourself several hundred dollars to get it replaced. More in labor than parts.
Use a soft cotton or very soft paper towel and wipe the excess toner from the drun. If there are lines worn in the surface of the drum, then replace it ASAP.