Brother MFC 9440CN User Manual

Troubleshooting and routine maintenance
141
C
cHold the green handle of the drum unit. 
Lift the drum unit up and then pull it out 
until it stops.
 
dRelease the grey lock lever (1) that is on 
the left side of the machine. Lift the front 
of the drum unit and pull the drum unit 
completely out of the machine using the 
green handles on the drum unit.
 
1
 

142
HOT SURFACE 
After you have just used the machine, some 
internal parts of the machine will be 
extremely hot. When you open the front 
cover of the machine, DO NOT touch the 
shaded parts shown in the illustration.
 
 
CAUTION 
Make sure that you use the drum unit 
handles when carrying it. DO NOT hold the 
sides of the drum unit.
 
 
 
We recommend that you place the drum 
unit on a flat surface protected by a piece of 
disposable paper or cloth in case of toner 
scatter or spillage.
 
 
To prevent...

Troubleshooting and routine maintenance
143
C
fPut the drum unit back in the machine as 
follows.
1Make sure that the grey lock 
lever (1) is in the up position and 
put the drum unit in the machine. 
Push down the grey lock lever (1).
 
Note
When you put the drum unit in the 
machine, match the green guides (1) of 
the drum unit handle to the green 
arrows (2) on both sides of the machine.
 
 
1
1
2
1
2
1
 

144
2Push the drum unit in until it stops. 
gClose the front cover of the machine. 
hPlug the machine’s power cord back into 
the AC electrical socket first, and 
reconnect all cables and telephone line 
cord. Turn on the machine’s power 
switch.
Cleaning the corona wiresC
If you have print quality problems, clean the 
corona wires as follows:
aTurn off the machine’s power switch. 
Unplug the telephone line cord first, and 
then unplug the power cord from the 
electrical socket.
bPress the front cover...

Troubleshooting and routine maintenance
145
C
cHold the green handle of the drum unit. 
Lift the drum unit up and then pull it out 
until it stops.
 
dUsing their coloured handles to lift them 
out, remove all four toner cartridges 
from the drum unit.
 
CAUTION 
We recommend that you place the toner 
cartridges on a clean, flat surface with a 
piece of disposable paper underneath it in 
case you accidentally spill or scatter toner.
  
DO NOT put a toner cartridges into a fire. It 
could explode,...

146
eUnclip and fold back the white corona 
wire cover (1).
 
Note
We recommended that you clean the 
corona wire for each of the colours. If you 
want to clean only the corona wire of the 
colour that caused the print quality 
problem, see the illustration below to 
identify the position of each of the corona 
wires. 
 
1 Corona wire cover for Black (K)
2 Corona wire cover for Yellow (Y)
3 Corona wire cover for Magenta (M)
4 Corona wire cover for Cyan (C)
 
fClean the corona wire inside the drum 
unit...

Troubleshooting and routine maintenance
147
C
iHolding the toner cartridges by their 
coloured handles, insert them one by 
one back into the drum unit as shown. 
Make sure that you match the toner 
cartridge colour to the same colour label 
on the drum unit, and make sure that 
you fold down the toner cartridge 
handle (A) once the toner cartridge is in 
place. Repeat this for all the toner 
cartridges.
 
1 C - Cyan
2 M - Magenta
3 Y - Yellow
4K - Black
jPush the drum unit in until it stops. 
kClose the...

148
Cleaning the drum unitC
If you have print quality problems caused by 
repeating marks on the page, clean the drum 
unit as follows.
aTurn off the machine’s power switch. 
Disconnect all cables, and unplug the 
telephone line cord first, and then 
unplug the power cord from the 
electrical socket.
bPress the front cover release button and 
then open the front cover. 
 
cHold the green handle of the drum unit. 
Lift the drum unit up and then pull it out 
until it stops.
 
 

Troubleshooting and routine maintenance
149
C
CAUTION 
We recommend that you place the drum 
unit and toner cartridges separately on a 
clean, flat surface with a piece of 
disposable paper underneath them in case 
you accidentally spill or scatter toner.
 
 
 
 
Handle the toner cartridge carefully. If toner 
scatters on your hands or clothes, wipe or 
wash it off with cold water at once.
 
dRelease the grey lock lever (1) that is on 
the left side of the machine. Lift the front 
of the drum unit and...

150
eUsing their coloured handles to lift them 
out, remove all four toner cartridges 
from the drum unit.
 
CAUTION 
To prevent damage to the machine from 
static electricity, DO NOT touch the 
electrodes shown in the illustration.
 
 
 
Handle the toner cartridges carefully. If 
toner scatters on your hands or clothes, 
wipe or wash it off with cold water at once.
  
To avoid print quality problems, DO NOT 
touch the shaded parts shown in the 
illustrations.