Brother MFC-9120CN User Manual page 166

Large spots on the printed pages
If your printout has colored spots at 94 mm
intervals, follow the steps below to solve the
problem.
a
Turn off the machine. Unplug the
telephone line cord first, disconnect all
cables, and then unplug the power cord
from the electrical socket.
b
Fully open the top cover by lifting up on
the handle (1).
1
IMPORTANT
When the scanner is open, you cannot
open the top cover.
156
c
See the print sample to identify the color
C
causing the problem. The color of the
spots is the color of the drum you should
clean. For example, if the spots are
cyan, you should clean the drum for
cyan. Take out the drum unit and toner
cartridge assembly of the color causing
the problem.
IMPORTANT
• We recommend that you place the drum
unit and toner cartridge assembly on a
clean, flat surface with a sheet of
disposable paper or cloth underneath it in
case you accidentally spill or scatter toner.
• To prevent damage to the machine from
static electricity, DO NOT touch the
electrodes shown in the illustration.