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 liquids such as thinner or benzine 
will damage the outside surface of the 
machine.
  
DO NOT use cleaning materials that 
contain ammonia.
  
DO NOT use isopropyl alcohol to remove 
dirt from the control panel. It may crack the 
panel.
  
DO NOT use flammable substances any 
type of spray to clean the inside or outside of 
the machine. Doing this may cause a fire or 
electrical shock. (For more information, see 
Important safety instructionson page 103.)
 
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							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 
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. 
Unplug the telephone line cord first, and 
then unplug the power cord from the 
electrical socket.
bLift the document cover (1).
Clean the white plastic surface (2) and 
scanner glass (3) underneath it with a 
soft lint-free cloth moistened with a non-
flammable glass cleaner.
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							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 strip to 
see if you can feel anything on it. If you 
feel dirt or debris, clean the glass strip 
again concentrating on that area. You may 
need to repeat the cleaning process three 
or four times. To test, make a copy after 
each cleaning.
 
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. 
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.
 
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							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 in the illustration.
 
 
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							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.
 
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							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.
 
 
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							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 
electrical socket.
bPress the front cover release button and 
then open the front cover.
 
 
						

							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 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.
 
 
 
 
 
						

							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)
 
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.
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4
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							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 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.
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