Brother MFC 9840CDW User Manual

							Troubleshooting and routine maintenance
159
C
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 cover of the machine. 
The machine starts warming up, wait 
until it finishes warming up before going 
on to stepc.
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 Mono Start or Colour Start. The 
paper will feed into the machine to start 
the drum cleaning. 
  
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
75 mm
75 mm1
2
 
						

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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 Ready state.
iTry to print again. If this problem still 
remains, repeat stepsc to h several 
times. 
If the problem still remains after 
repeating stepc to h several times, go 
to stepj.
jTurn off the machine’s power switch. 
Unplug the telephone line cord first, and 
then unplug the power cord from the 
electrical socket.
kPress the front cover release button and 
then open the front cover. 
 
lHold the green handle of the drum unit. 
Lift the drum unit up and then pull it out 
until it stops.
 
 
						

							Troubleshooting and routine maintenance
161
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.
 
mRelease 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.
 
CAUTION 
Make sure that you use the drum unit 
handles when carrying it. DO NOT hold the 
sides of the drum unit.
 
 
1
 
						

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nUsing 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.
 
 
 
 
 
						

							Troubleshooting and routine maintenance
163
C
oWhile holding both hands, turn the drum 
unit upside down and place on a piece of 
disposable paper or cloth. Make sure 
that the drum unit gears (1) are on your 
left hand side.
 
pSee the print sample to identify the 
colour causing the problem. The colour 
of the spots or toner stain is the colour 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 the 
find the exact position of the repeating 
mark.
 
qTurn the drum unit gear on the drum that 
matches that mark (for example, for a 
cyan mark, turn the drum for cyan). You 
should see the mark eventually on 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 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 excessive force when 
cleaning the drum surface.
 
11
 
						

							164
sTurn the drum unit gear toward you by 
hand to return it to the home position. 
The home position of each drum can be 
identified by matching the number on 
the drum unit gear to the same number 
on the side of the drum unit as shown in 
the illustration. Make sure that the 
number on each of the four drum unit 
gears matches the corresponding 
number on the side of the drum unit.
 
tHolding 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
A
1
2
3
4
 
						

							Troubleshooting and routine maintenance
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uPut 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
 
						

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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 electrical socket first, and 
reconnect all cables.
Turn on the machine’s power switch.
 
						

							Troubleshooting and routine maintenance
167
C
Replacing the consumable itemsC
When the time comes to replace consumable items, the following messages will appear on the 
LCD.
The machine will stop printing when the following maintenance messages appear on the LCD.
1The toner cartridge colour which is used up is shown in the message.
2At 5% print coverage (A4 or Letter size). The actual number of printed pages will vary depending on the print jobs and 
paper you use.
3At 5% print coverage for CMYK each (A4 or Letter size). The actual number of printed pages will vary depending on 
the print jobs and paper you use.
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 colour which is near the end of life is shown in the message.2At 5% print coverage (A4 or Letter size). The actual number of printed pages will vary depending on the print jobs and 
paper you use.
3At 5% print coverage for CMYK each (A4 or Letter size). The actual number of printed pages will vary depending on 
the print jobs and paper you use.
LCD messagesConsumable item 
to replaceApproximate lifeHow to replaceOrder No.
Toner Life End
Replace Black(K)
Toner Cartridge.
1
Toner cartridges 
standard2,500 pages (Black)2
1,500 pages (Cyan, 
Magenta, Yellow)2
See Replacing a toner 
cartridgeon page 169.TN-130BK
TN-130C
TN-130M
TN-130Y
Toner cartridges 
high yield5,000 pages (Black)
2
4,000 pages (Cyan, 
Magenta, Yellow)2
TN-135BK
TN-135C
TN-135M
TN-135Y
Waste Toner FullWaste toner box
20,000 pages
3See Waste Toner Box Full 
messageon page 186.WT-100CL
LCD messagesConsumable item 
to replaceApproximate lifeHow to replaceOrder No.
Toner Low
Prepare New Black(K) 
Toner Cartridge.1
Toner cartridges 
standard2,500 pages (Black)2
1,500 pages (Cyan, 
Magenta, Yellow)2
See Replacing a toner 
cartridgeon page 169.TN-130BK
TN-130C
TN-130M
TN-130Y
Toner cartridges 
high yield5,000 pages (Black)
2
4,000 pages (Cyan, 
Magenta, Yellow)2
TN-135BK
TN-135C
TN-135M
TN-135Y
Change Parts
Waste Toner BoxWaste toner box
20,000 pages
3See Replacing the waste 
toner boxon page 186.WT-100CL
 
						

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The following are maintenance messages that appear alternately with the normal message on the 
upper row of the LCD when the machine is in the Ready mode. These messages advise you that 
you will need to replace each of the consumable items as soon as possible, since the consumable 
item’s end of life has been reached. The machine will continue printing when any of these 
messages appear on the LCD.
1When printing on Letter or A4 size paper. The actual number of printed pages will vary depending on the print jobs 
and paper you use.
Note
• Discard used consumable items according to local regulations, keeping it separate from 
domestic waste. If you have questions, call your local waste disposal office. Be sure to reseal 
the consumable items tightly so that the material inside does not spill.
• We recommend placing used consumable items on a piece of paper to prevent accidentally 
spilling or scattering the material inside.
• If you use paper that is not a direct equivalent for the recommended paper, the life of 
consumable items and machine parts may be reduced.
• The projected life for toner cartridges and a waste toner box is based on an average 5% 
coverage of the printable area using any colour toner cartridge. Frequency of replacement will 
vary depending on the complexity of printed pages, percentage of coverage and type of media 
used.
 
LCD messagesConsumable item to 
replaceApproximate life1How to replaceOrder No.
Change Parts
DrumDrum unit 17,000 pages See Replacing the drum 
uniton page 174.DR-130CL
Change Parts
Belt UnitBelt unit 50,000 pages See Replacing the belt 
uniton page 181.BU-100CL
Change Parts
Fuser UnitFuser  unit 80,000 pages Call your Brother dealer to 
purchase the fuser unit.—
Change Parts
Laser UnitLaser  unit 100,000 pages Call your Brother dealer to 
purchase the laser unit.—
Change Parts
PF kit 1Paper feeding kit 1
(Paper pick-up roller 
and Separator pad for 
Tray 1)100,000 pages Call your Brother dealer to 
purchase the paper 
feeding kit 1.—
Change Parts
PF kit 2
(when the optional lower 
tray is installed)Paper feeding kit 2
(Paper pick-up roller 
and Separator pad for 
Tray 2)100,000 pages Call your Brother dealer to 
purchase the paper 
feeding kit 2.—
Change Parts
PF kit MPPaper feeding kit MP
(Paper pick-up roller 
and Separator pad for 
MP tray)50,000 pages Call your Brother dealer to 
purchase the paper 
feeding kit MP.—