Brother MFC 9970CDW - Manual (Page 110)

102
Cleaning the drum unit
A
If your printout has coloured dots at 94 mm
intervals, follow the steps below to solve the
problem.
a
Make sure that the machine is in the
Ready mode.
b
Press MENU.
c
Press a or b to display
Print Reports.
Press Print Reports.
d
Press a or b to display
Drum Dot Print.
Press Drum Dot Print.
e
The machine will display Press Start.
Press Mono Start or Colour Start.
f
The machine will print the Drum Dot test
print. Then press Stop/Exit.
g
Turn off the machine. Unplug the
telephone line cord first, disconnect all
cables, and then unplug the power cord
from the electrical socket.
h
Press the front cover release button and
then open the front cover.