Brother MFC-9340CDW - Cleaning the Drum Unit

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Cleaning the drum unit A
If your printout has black or white dots or
other repeating marks at 3.7 in. (94 mm)
intervals, the drum may have foreign
material, such as glue from a label stuck on
the drum surface. Follow these steps to solve
the problem.
a Make sure the machine is in the Ready
mode.
b Press .
c Press All Settings.
d Swipe up or down, or press a or b to
display Print Reports.
e Press Print Reports.
f Swipe up or down, or press a or b to
display Drum Dot Print.
g Press Drum Dot Print.
h The Touchsceen will show
Press [OK].
Press OK.
i The machine will print the Drum Dot
Check Sheet. Then press .
j Press and hold down to turn off the
machine.
k Open the top cover until it locks in the
open position.
l The color of printed dots is the color of
the drum you should clean. Remove the
toner cartridge and drum unit assembly
of the color causing the problem.