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Try to remove toner cartridge and shake, plug in and make a self test print. if not work, you need to change new toner cartridge to make sure that the problem is not with printer itself.
remove the toner cart and lower the top cover about 1/2 way. Look inside and you will see 2 grey rollers hanging from the top on 2 arms. Move the right side arm to the right and grey rollers will fall out (they are as wide as a sheet of paper)
use a light scrubbing with a damp cloth to remove the grey, the rubber should be a tan colour. Dry them off well, insert the left side first (cover in the 1/2 closed position makes moving that right arm easy. install the toner cart again and print a page. It should be nice and dark now, just make sure the rollers are dry when you reinstall them.
1. Open the front cover of the printer and remove the drum/toner unit.
2. Gently wipe the scanner window with a soft dry cloth. The scanner window is located on the roof of the inside of the printer.
3. On the top of the drum unit, locate the blue tab on the left side. Slide it back and forth across the drum about 30 times.
4. Remove the toner cartridge (TN430 or TN460) from the drum unit (DR400). To remove the toner from the drum: hold down the blue lever on the right side of the drum (DR400) and lift the toner (TN430 or TN460) off of the drum unit.
5. Inside the drum unit (DR400) there is a green roller. Wipe the green drum roller with a dry tissue (i.e. Kleenex). You may turn this roller by moving the gears on the far left side.
6. If the pages area gray pages or have gray vertical lines, install a brand new toner cartridge. If pages have dots, spots, smudges or horizontal lines, install a brand new drum unit. OR If you are still experiencing gray pages or gray vertical lines, please install a brand new toner cartridge (TN430 or TN460).
Brother strongly recommends that customers do not use generic drum unitsand/or toner cartridges, or refill their Brother toner cartridge. Each Brother laser printer is designed to work at pre-set temperatures that are matched exactly to each of our individual toner formulations. Each individual component is designed to work with the other to ensure quality and reliability. Using non-Brother supplies may affect the hardware performance, print quality and machine reliability. The Brotherlimited warranty does not apply to any problem that is caused by the useof unauthorized third party drum units, toner cartridges or toner.
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If the spacing between dots are the same, then you have a dirty or bad roller. If you never had this problem prior to installing the new toner cartridge, then I would suspect you have a bad one. Try a different toner.
Remove the toner cartridge and drum assembly together. Gently rock the assembly from end to end, as when installing a new toner cartridge. Then put the assembly back in place. This procedure worked for me. I'm guessing that I must have laid the toner and/or drum on its side, or perhaps upside down, when I was replacing the drum, and this was responsible for the problem.
ok what you need to do is take the cartridge out of the machine . put it in a bag so the toner does not spill shake left to right about 20 times. and put it back in. it does this because the toner was probably stored on its side.
You just might have a faulty black toner cartridge think back did the problem arise when you installed the new black cartridge. Also is the toner a original if not change for a original.
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