Brother MFC 9450CDN User Manual

Troubleshooting and routine maintenance
141
C
eWipe the inside of the paper tray with a 
dry, lint-free cloth to remove dust.
 
fRe-load the paper and put the paper tray 
firmly back in the machine.
gPlug 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 scannerC
aTurn off the machine’s power switch. 
Disconnect all cables, and unplug the 
telephone line cord first, and then 
unplug the...

142
Cleaning the laser scanner 
windowsC
CAUTION 
DO NOT use isopropyl alcohol to clean the 
laser scanner windows.
  
DO NOT touch the laser scanner windows 
with your fingers.
 
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...

Troubleshooting and routine maintenance
143
C
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.
 
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...

144
 
To prevent damage to the machine from 
static electricity, DO NOT touch the 
electrodes shown in the illustration.
 
 
eWipe the scanner windows (1) with a 
dry, lint-free cloth.
 
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).
 
1
1
1
 

Troubleshooting and routine maintenance
145
C
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.
 
 
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.
2
1
2
1
 

146
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 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.
 
dUsing their coloured handles to lift them 
out, remove all four toner cartridges 
from the...

Troubleshooting and routine maintenance
147
C
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, resulting in injuries.
  
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...

148
fClean the corona wire inside the drum 
unit by gently sliding the green tab from 
left to right and right to left several times.
 
CAUTION 
Be sure to return the tab to the home 
position (b) (1). If you do not, printed pages 
may have a vertical stripe.
 
gClose the corona wire cover. 
hRepeat e to g to clean each of the 
remaining corona wires. There are four 
corona wires in total.
iHolding the toner cartridges by their 
coloured handles, insert them one by 
one back into the drum unit as shown....

Troubleshooting and routine maintenance
149
C
jPush the drum unit in until it stops. 
kClose the front cover of the machine. 
lPlug 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 drum unitC
If you have print quality problems caused by 
repeating marks on the page, clean the drum 
unit as follows.
aPress the front cover release button and 
then open the front cover.
 
bClose the front...

150
cPull out the MP tray (1) and unfold the 
MP tray support flap (2).
 
dPut a blank sheet of A4 or Letter sized 
paper in the MP tray.
 
eWhile pressing and holding down 
Clear/Back press d until 
DRUM CLEANING is displayed on the 
LCD.
 
fPress Mono Start or Colour Start. The 
paper will feed into the machine to start 
the drum cleaning. 
gThe following message appears on the 
LCD when the machine has finished 
cleaning.
 
DRUM CLEANING
COMPLETED
hPress Stop/Exit so that the machine 
returns to the...