Brother MFC 7840W - Manual (Page 137)

Troubleshooting and routine maintenance
123
B
g
Plug the machine’s power cord back into
the AC power outlet first, and then
reconnect all cables and telephone line
cord. Turn on the machine’s power
switch.
CAUTION
To avoid print quality problems, DO NOT
touch the shaded parts shown in the
illustrations below.
Cleaning the drum unit
B
If you have print quality problems, clean the
drum unit as follows.
a
Turn off the machine’s power switch.
Unplug the telephone line cord first, and
then unplug the power cord from the AC
power outlet.
b
Open the front cover.
c
Slowly take out the drum unit and toner
cartridge assembly.
CAUTION
We recommend that you put 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.