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don't always believe what they say. just because its "supposed to " last a certain amount of time, doesn't mean it will. Once you get the insides dirty, its hard to get them straight again. Sometimes there is build up on the printer head from a leaky cartridge. I'm just guessing cause I had a similar brand that was brand new act up on me and because I was printing bold it started rolling the paper. I put it on economy printing to save toner and after a few runs, it cleared up. plus using a watermark helped but don't think that will help you in your situation.
Sometimes when I get a streak on one side its from light coming in from somewhere and it thinks its part of the image and prints it. If you make sure that your material is flat and not allowing light to come in or its firmly against the glass it might help.
When you see light print it can be from a few things. This is basically a laser printer with a fax machine so the same problems exist in both. The most common cause by far is simply low toner. If you take out the toner cartidge and gentl shake it side to side then put it back in. Now try printing again. This should be much darker. This may only last a few dozen pages (but can go a quite a bit more if you are lucky) but it shows you that you need to get a new toner cartridge. The other causes can be a image setting in the fax. In the control panel it will show you a setting for how dark it will print. Normally it is in the middle of the range. The last common thing is a fusor wire. This normally shows up as a error first but it can slowly fail. The fusor is the heater that bonds the toner to the paper. If it doesn't get hot enough then not all the toner sticks and you get light printing.
on the drum unit that you put your toner inn, There is a blue or green slide lever move the slide back and fourth 10-15 times. If you have some van air blow that area out ( F.Y.I. if you do this some toner will fly out ) if this does not take care of it the drum unit my be bad,
do a 1/2 print test. copiersomething with a lot of print. open front cover when the paper is 1/2 way through the machine remove drum. Look art the paper and the green drum if the marks are on the paper & drum then the drum is bad. If not the fuser asm is bad, the part that gits hot when melting the toner on the paper,
If the print can be rubbed off then this suggests the fuser unit is not working correctly. It could be that the thermistor is covered with toner and making the machine think the fuser is hot enough when it's not.
The black line could also be caused by the fuser if one of the pick off fingers is coated with toner or has worn into the Teflon of the roller.
Does the machine show the lines when you print a page from memory - such as a counter or config page? If not, this would suggest the optical path is dirty. Try cleaning the glass and look at the mirrors inside the scanner to see if they are dirty/dusty.
First and most important with Brother machines is , you need to use genuine brother supplies. Almost every time I service a brother and I find generic toner and drums cause the print quality issues. New supplies cost as much as a new machine. If not the supplies then it is laser or power supply.