Brother MFC 9120CN User Manual

							
Troubleshooting and routine maintenance159
C
eSlide each drum unit and toner cartridge 
assembly into the machine. Make sure 
that you match the toner cartridge colour 
to the same colour label on the machine. 
 
 
C-Cyan M-Magenta Y-Yellow K-Black
fRepeat stepsc to  e to clean the 
remaining corona wires.
gClose the top cover of the machine.
hPlug the machine’s power cord back into 
the electrical socket first, and then 
reconnect all cables and telephone line 
cord. Turn on the machine.
Cleaning the drum unitC
Small spots on the printed pagesC
If your printout has any small white or 
coloured spots, follow the steps below to 
solve the problem.
aOpen the manual feed slot cover. 
bUsing both hands, slide the manual feed 
slot paper guides to the width of the 
paper that you are going to use.
 
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cUsing both hands, put one blank sheet 
of paper in the manual feed slot until the 
front edge of the paper touches the 
paper feed roller. Wait until the machine 
automatically feeds the paper. When 
you feel the machine pull in the paper, 
let go.
 
Note
• Make sure that the paper is straight and in the correct position on the manual feed 
slot. If it is not, the paper may not be fed 
correctly, resulting in a paper jam.
• Do not put more than one piece of paper  in the manual feed slot at any one time, as 
it may cause a jam.
• If you put paper in the manual feed slot  before the machine is in the Ready mode, 
an error may occur and the machine will 
stop printing.
 
dMake sure that the machine is in the 
Ready mode.
Press  Menu, 4, 8.
 
Drum Cleaning
Press Start
ePress  Mono Start  or Colour Start . The 
machine will pull in the piece of paper 
and start cleaning the drum unit.
 
Drum Cleaning
Please Wait
 
fWhen the machine has finished 
cleaning,  Completed  appears on the 
LCD. Press Stop/Exit so that the 
machine returns to the Ready mode.
gRepeat steps c to f two more times 
using a new blank sheet of paper each 
time. Upon completion please discard 
the used paper. If the print problem is 
not resolved please contact your 
Brother dealer.
 
						

							
Troubleshooting and routine maintenance161
C
Large spots on the printed pagesC
If your printout has coloured spots at 94 mm 
intervals, follow the steps below to solve the 
problem.
aTurn off the machine. Unplug the 
telephone line cord first, disconnect all 
cables, and then unplug the power cord 
from the electrical socket.
bFully open the top cover by lifting up on 
the handle (1).
 
IMPORTANT
When the scanner is open, you cannot 
open the top cover.
 
cSee the print sample to identify the 
colour causing the problem. The colour 
of the spots is the colour of the drum you 
should clean. For example, if the spots 
are cyan, you should clean the drum for 
cyan. Take out the drum unit and toner 
cartridge assembly of the colour causing 
the problem. 
 
IMPORTANT
• We recommend that you place the drum unit and toner cartridge assembly on a 
clean, flat surface with a sheet of 
disposable paper or cloth underneath it in 
case you accidentally spill or scatter toner.
• To prevent damage to the machine from  static electricity, DO NOT touch the 
electrodes shown in the illustration.
 
 
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162
dPush down the green-labelled lock 
lever (1) and take the toner cartridge out 
of the drum unit.
 
IMPORTANT
Handle the toner cartridge carefully. If 
toner scatters on your hands or clothes, 
wipe or wash it off with cold water at once.
 
ePut the print sample in front of the drum 
unit, and find the exact position of the 
poor print.
 
fTurn the drum unit gear by hand while 
looking at the surface of the OPC 
drum (1).
 
gWhen you have found the mark on the 
drum that matches the print sample, 
wipe the surface of the OPC drum with a 
dry cotton swab until the dust or glue on 
the surface comes off.
 
IMPORTANT
DO NOT clean the surface of the 
photosensitive drum with a sharp object.
 
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Troubleshooting and routine maintenance163
C
hPut the toner cartridge back firmly into 
the drum unit until you hear it lock into 
place.
Note
Make sure that you put in the toner 
cartridge correctly or it may separate from 
the drum unit.
 
iSlide each drum unit and toner cartridge 
assembly into the machine. Make sure 
that you match the toner cartridge colour 
to the same colour label on the machine. 
 
 
C-Cyan M-Magenta Y-Yellow K-Black
jClose the top cover of the machine.
kPlug the machine’s power cord back into 
the electrical socket first, and then 
reconnect all cables and telephone line 
cord. Turn on the machine.
 
h
 
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164
Cleaning the paper pick-up 
rollersC
If you have paper feed problems, clean the 
pick-up rollers as follows:
aTurn off the machine. Unplug the power 
cord from the electrical socket.
bPull the paper tray completely out of the 
machine.
 
cTightly wring out a lint-free cloth soaked 
in lukewarm water, and then wipe the 
separator pad (1) of the paper tray with 
it to remove dust. 
 
dWipe the two pick-up rollers (1) inside of 
the machine to remove dust.
 
ePut the paper tray back in the machine.
fPlug the machine’s power cord back into 
the electrical socket. Turn on the 
machine.
CalibrationC
The output density for each colour may vary 
depending on the environment the machine is 
in such as temperature and humidity. 
Calibration helps you to improve the colour 
density.
aPress Menu, 4, 5. 
bPress  a or  b to select  Calibrate . 
cPress OK. 
dPress  1 to select  Yes. 
ePress  Stop/Exit .
You can reset the calibration parameters 
back to those set at the factory.
aPress  Menu, 4, 5. 
bPress  a or  b to  Reset .
cPress OK.
dPress  1 to select  Yes.
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Troubleshooting and routine maintenance165
C
ePress Stop/Exit . 
Note
• If an error message is displayed, press 
Stop/Exit  and try again. For more 
information, see  Error and maintenance 
messages  on page 142.
• If you print using Windows
® printer driver, 
you need to perform the calibration from 
the Windows
® printer driver. See 
Advanced tab  in the Software Users 
Guide  on the CD-ROM.
• If you print using the Macintosh printer  driver, you need to perform the calibration 
using the status monitor. See  Status 
Monitor  in the Software Users Guide  on 
the CD-ROM. When the  Status Monitor 
is open, choose  Control / Color 
Calibration  from the menu bar.
 
Auto RegistrationC
Registration C
If solid areas of colour or images have cyan, 
magenta or yellow fringes, you can use the 
auto-registration feature to correct the 
problem.
aPress Menu, 4, 6,  1. 
bTo start, press  1. 
To exit, press  2. 
cPress  Stop/Exit . 
FrequencyC
You can set the machine to carry out auto 
registration regularly, and also how often it 
occurs.
aPress Menu, 4, 6,  2. 
bPress  a or  b to choose  Low, Medium , 
High  or Off . 
Press  OK. 
cPress  Stop/Exit . 
Manual RegistrationC
If colour still appears incorrectly after auto-
registration, you will need to perform manual 
registration.
aPress Menu, 4, 7,  1. 
bPress  Mono Start  or Colour Start  to 
start printing the colour registration 
chart.
cWhen the machine has finished printing 
the registration sheet, 
press  2 ( Set Regist. ) to correct the 
colour manually.
dStarting at  1 (Magenta) on the chart, 
check which coloured bar has the most 
uniform print density and enter its 
number into the machine using the 
a and  b keys. 
Press  OK.
Repeat for  2 (Cyan),  3 (Yellow),  4, 5 , 6 
to  9.
ePress  Stop/Exit . 
 
						

							
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Replacing the consumable itemsC
The following messages appear on the LCD in the Ready mode. These messages provide 
advanced warnings to replace the consumable items before they reach the end of their life. To 
avoid any inconvenience, you may want to buy spare consumable items before the machine stops 
printing.
1A4 or Letter size single-sided pages. 
2Approx. cartridge yield is declared in accordance with ISO/IEC 19798.
31 page per job.
4Drum life is approximate and may vary by type of use.
5Contains 4pc. Drum Set.
6Contains 1pc. Black Drum Unit.
7Contains 1pc. Colour Drum Unit.
LCD messagesConsumable item 
to replaceApproximate lifeHow to replaceModel name
Toner Low
Prepare New X 
Toner Cartridge.
Toner cartridge
X = Cyan, 
Magenta, Yellow, 
Black 
2,200 pages
12

1,400 pages
12
See page 168. TN-240BK, 
TN
-240C, 
TN
-240M, 
TN-240Y 
Drums End Soon 4 Drum units
15,000 pages
134See page 173.DR-240CL5 
Drum End Soon(X)1 Drum unit
X =  C, M , Y , K
C  = Cyan
M  = Magenta
Y  = Yellow
K  = Black 15,000 pages134See page 173.
DR-240CL-BK6, 
DR-240CL-CMY
7
Belt End Soon Belt unit
50,000 pages1See page 177. BU-200CL
WT Box End SoonWaste toner box50,000 pages1See page 181. WT-200CL
 
						

							
Troubleshooting and routine maintenance167
C
You will need to replace certain parts and clean the machine regularly.
1A4 or Letter size single-sided pages. 
2Approx. cartridge yield is declared in accordance with ISO/IEC 19798.
31 page per job.
4Drum life is approximate and may vary by type of use.
5Contains 4pc. Drum Set.
6Contains 1pc. Black Drum Unit.
7Contains 1pc. Colour Drum Unit.
8The Drum Error  message has two cases: If the scroll message shows  Replace the Drum Unit. you will need 
to replace the drum unit. If the scroll message shows  Slide the Green tab on Drum Unit. you do not need 
to replace the drum unit, you just need to clean the corona wires. (See  Cleaning the corona wires on page 158.)
LCD messagesConsumable item 
to replaceApproximate lifeHow to replaceModel name
Replace Toner Toner cartridge 
2,200 pages
12

1,400 pages
12
See page 168. TN-240BK, TN
-240C, 
TN
-240M, 
TN-240Y 
Replace Drums 4 Drum units
15,000 pages
134See page 174.DR-240CL5 
Replace Drum(X)1 Drum unit
X =  C, M , Y , K
C  = Cyan
M  = Magenta
Y  = Yellow
K  = Black 15,000 pages134See page 174.
DR-240CL-BK6, 
DR-240CL-CMY
7
Drum Error8Drum unit 15,000 pages134See page 174.
Replace Belt Belt unit
50,000 pages
1See page 177. BU-200CL
Replace WT Box Waste toner box
50,000 pages
1See page 181. WT-200CL
Replace Fuser Fuser unit
50,000 pages
1Call your dealer or Brother Customer 
Service for a replacement fuser unit.
Replace PF Kit Paper feeding kit
50,000 pages
1Call your dealer or Brother Customer 
Service for a replacement paper feeding 
kit.
 
						

							
168
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 of the cartridge is based on ISO/IEC 19798. Frequency of replacement will  vary depending on the complexity of printed pages, percentage of coverage and type of media 
used.
 
Replacing a Toner cartridgeC
The Standard toner cartridges can print 
approximately 2,200 pages (black) or 
approximately 1,400 pages (yellow, magenta, 
cyan)
1. Actual page count will vary 
depending on your average type of 
document. The machine is supplied with a 
Starter toner cartridge that will need to be 
replaced after approximately 1,000 pages
1. 
When a toner cartridge is running low, the 
LCD shows  Toner Low .
1Approx. cartridge yield is declared in accordance 
with ISO/IEC 19798.
Note
• It is a good idea to keep a new toner 
cartridge ready for use when you see the 
Toner Low  warning.
• To ensure high quality printing, we  recommend that use only Genuine 
Brother Brand toner cartridges. When you 
want to buy toner cartridges, please call 
your Brother dealer.
• We recommend that you clean the  machine when you replace the toner 
cartridge. See  Routine maintenance  
on page 155.
• If you change the print density setting for  lighter or darker printing, the amount of 
toner used will change.
• Wait to unpack the toner cartridge until  immediately before you put it into the 
machine.
 
Toner Low messageC
 
Toner Low
Prepare...
If the LCD shows  Toner Low 
Prepare New X Toner Cartridge. , 
the machine has nearly run out of toner. Buy 
a new toner cartridge and have it ready 
before you get a  Replace Toner  message. 
The LCD shows the toner colour that is near 
the end of its life (Black, Yellow, Magenta or 
Cyan).
Replace Toner messageC
When the following message appears on the 
LCD, you need to replace the toner cartridge:
 
Replace Toner
The scrolling message on the LCD indicates 
which colour you need to replace.
aTurn off the machine. Unplug the 
telephone line cord first, and then 
unplug the power cord from the 
electrical socket.