Description of Problem 100000028823
The printed pages have black vertical lines or streaks. How can I improve the
print quality?Description of Solution 200000036977
strongly recommends that customers use only genuine Brother drum units and/or
toner cartridges. 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 Brother
limited warranty does not apply to any problem that is caused by the use of
third party drum units, toner cartridges, or toner.
Print the Printer Settings pages by pressing the OK key 3 times.
no black vertical lines appear, the issue appears to be resolved.
black vertical lines appear on the Printer Settings page, continue to the next
Perform a manual cleaning of the drum surface:
Open the front cover.
Take out the drum unit and toner cartridge assembly by pulling on the handle in
the middle of the drum unit and toner cartridge assembly.
recommend that you place the drum unit and toner cartridge assembly on a piece
of paper in case you accidentally spill or scatter toner.
Push down the green lock lever on the right side of the drum unit and toner
cartridge assembly and then lift the toner cartridge out of the drum unit.
Handle the toner cartridge carefully. If toner scatters on your hands or
clothes, immediately wash it off with cold water.
Inside the drum unit is a roller. Clean the roller by gently wiping the entire
surface with a lint free cloth or cotton swab lightly moistened with isopropyl
alcohol (91% strength alcohol is preferred, but 70 - 75% strength alcohol is
also acceptable). You can also use an alcohol swab, such as a medical
alcohol pad or wipe, which can be found in a first aid kit. Use the white
gear on the far left side to turn the roller and ensure you clean the entire
precaution please note:
alcohol is flammable and should be kept away from fire or flame.
physical damage, such as scratches, nicks, or gashes in the surface of the drum,
is found when inspecting the drum, there is no need to continue cleaning since
it will not resolve the issue. The drum (DR720) needs to be
Before continuing further, allow the alcohol to evaporate or dry off the drum
Once the drum surface is dry, clean the primary corona wire inside the drum unit
by gently sliding the green tab located at the top of the drum unit from left to
right and back several times. Be sure to return the green tab to the home
Reinstall the toner into the drum (be sure it clicks into place). If you put it
in properly, the green lock lever will lift automatically.
Reinstall the drum and toner assembly into the machine and close the front
cover, pressing firmly on each side until the cover clicks into
Print 10 to 15 blank pages from the computer to further clean any remaining
debris left on the drum surface.
Print the Printer Settings pages by pressing the OK key 3
no black vertical lines appear, the issue is resolved.
black vertical lines still appear on the Printer Settings pages, a second manual
drum cleaning may be needed. Repeat STEPS 2 - 4.
If there are still black vertical lines after doing two (2) manual drum
cleanings, the toner (TN720,
TN750, or TN780)
needs to be replaced.
the vertical lines continue after replacing the toner, the drum unit (DR720)
will need to be replaced.