Brother DCP 9040CN User Manual

Troubleshooting and routine maintenance
89
C
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.
iHold the handle of the toner cartridge 
and slide the toner cartridge into the 
drum unit. Make sure that you...

90
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 power outlet first, and reconnect 
all cables. Turn on the machine’s power 
switch.
Cleaning the drum unitC
If you have the following print quality 
problems, clean the drum unit as follows.
aPress the front cover release button and 
then open the front cover.
 
bClose the front cover of the machine. 
The machine starts warming up, wait 
until it finishes warming up before...

Troubleshooting and routine maintenance
91
C
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 pressd until 
DRUM CLEANING is displayed on the 
LCD.
 
fPress Black Start or Color 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...

92
lHold the green handle of the drum unit. 
Lift the drum unit up and then pull it out 
until it stops.
 
mRelease the gray 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.
 
CAUTION 
Hold the handles of drum unit when you 
carry it. DO NOT hold the sides of the drum 
unit.
 
 
1
 

Troubleshooting and routine maintenance
93
C
CAUTION 
We recommend that you place the drum 
unit on a clean, flat surface with a piece of 
disposable paper underneath it in case you 
accidentally spill or scatter toner.
 
 
nHold the handle of the toner cartridge 
and pull it out of the drum unit. Repeat 
this for all of the toner cartridges.
 
CAUTION 
We recommend that you place the toner 
cartridges on a clean, flat surface with a 
piece of disposable paper underneath them 
in case you accidentally...

94
CAUTION 
To avoid print quality problems, DO NOT 
touch the shaded parts shown in the 
illustrations.
 
 
 
 
oTurn the drum unit over by holding the 
green handles. Make sure that the drum 
unit gears (1) are on the left hand side.
 
pSee the print sample to identify the color 
causing the problem. The color of the 
spots or toner stain is the color of the 
drum you should clean. For example, if 
the spots are cyan, you should clean the 
drum for cyan. Put the print sample in 
front of the drum, and...

Troubleshooting and routine maintenance
95
C
qTurn the drum unit gear toward you by 
hand while looking at the surface of the 
drum (1).
 
rWhen you have found the mark on the 
drum that matches the print sample, 
wipe the surface of the drum gently with 
a dry cotton swab until the dust or paper 
powder on the surface comes off.
 
CAUTION 
The drum is photosensitive so DO NOT 
touch it with your fingers.
  
DO NOT clean the surface of the 
photosensitive drum with a sharp object.
  
DO NOT use a...

96
tHold the handle of the toner cartridge 
and slide the toner cartridge into the 
drum unit. Make sure that you match the 
toner cartridge color to the same color 
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.
 
1Cyan
2Magenta
3Yellow
4 Black
uPut the drum unit back in the machine as 
follows.
1Make sure that the gray lock 
lever (1) is in the up position and 
put the drum unit...

Troubleshooting and routine maintenance
97
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. 
vClose the front cover of the machine. 
wPlug the machine’s power cord back into 
the AC power outlet first, and reconnect 
all cables. Turn on the machine’s power 
switch.
2
1
2
1
 

98
Replacing the consumable itemsC
You will need to replace the following consumable items regularly. When the time comes to 
replace consumable items, the following messages will appear on the LCD.
The following are maintenance messages that appear on the LCD in the Ready mode. These 
message provide advanced warnings to replace the consumable items before they run out. To avoid 
any inconvenience, you may wish to buy spare consumable items before the machine stops printing.
1The toner cartridge color...