Brother MFC 9840CDW User Manual

Troubleshooting and routine maintenance
149
C
ePull out the jammed paper slowly. 
fReset the grey lever on the left hand 
side (1) back to the original position.
 
gClose the back cover. 
hPut the paper tray firmly back in the 
machine.
Routine maintenanceC
CAUTION 
The drum unit contains toner, so handle it 
carefully. If toner scatters on your hands or 
clothes, wipe or wash it off with cold water 
at once.
 
Cleaning the outside of the 
machineC
CAUTION 
Use neutral detergents. Cleaning with 
volatile...

150
Clean the outside of the machine as 
follows:
C
aTurn off the machine’s power switch. 
Unplug the telephone line cord first, and 
then unplug the power cord from the 
electrical socket.
bPull the paper tray completely out of the 
machine.
 
cWipe the outside of the machine with a 
dry, lint-free cloth to remove dust.
 
dRemove anything that is stuck inside the 
paper tray.
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...

Troubleshooting and routine maintenance
151
C
cIn the ADF unit, clean the white bar (1) 
and the scanner glass strip (2) 
underneath it with a soft lint-free cloth 
moistened with a non-flammable glass 
cleaner.
 
dPlug 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.
Note
In addition to cleaning the glass and glass 
strip with a non-flammable glass cleaner, 
run your finger tip over the glass...

152
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.
 
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...

Troubleshooting and routine maintenance
153
C
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 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.
 
1
 

154
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
 

Troubleshooting and routine maintenance
155
C
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...

156
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, resulting in injuries.
  
Handle the toner...

Troubleshooting and routine maintenance
157
C
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)...

158
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
4 K - Black
jPush the drum unit in until it stops. 
kClose the front cover of the machine. 
lPlug the...