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...

160
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...

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...

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,...

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...

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....

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...

166
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....

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...

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...