Brother MFC 9120CN User Manual

Troubleshooting and routine maintenance179
C
• To avoid print quality problems, DO NOT touch the shaded parts shown in the 
illustrations.
 
 
 
 
dHold the green handle of the belt unit 
and lift the belt unit up, then pull it out.
 
h
 
 

180
IMPORTANT
To avoid print quality problems, DO NOT 
touch the shaded parts shown in the 
illustration.
 
 
 
eUnpack the new belt unit and put the 
new belt unit in the machine.
 
h
 
 

Troubleshooting and routine maintenance181
C
fSlide 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. 
Repeat this for all the drum unit and 
toner cartridge assemblies.
 
 
C-Cyan M-Magenta Y-Yellow K-Black
gClose the top cover of the machine. When you replace a belt unit with a new 
one, you need to reset the belt unit 
counter by completing the following 
steps:
C
aPlug the machine’s power cord...

182
Replace WT Box messageC
When the following message appears on the 
LCD, you need to replace the waste toner 
box:
 
Replace WT Box
IMPORTANT
DO NOT reuse the waste toner box.
 
WARNING 
DO NOT put the waste toner box into a fire. 
It could explode.
  
Be careful not to spill the toner. DO NOT 
inhale or allow it to get into your eyes.
 
aTurn off the machine. Unplug the 
telephone line cord first, and then 
unplug the power cord from the 
electrical socket.
bFully open the top cover by lifting up on...

Troubleshooting and routine maintenance183
C
• To avoid print quality problems, DO NOT touch the shaded parts shown in the 
illustrations.
 
 
 
 
dHold the green handle of the belt unit 
and lift the belt unit up, then pull it out.
 
h
 
 

184
IMPORTANT
To avoid print quality problems, DO NOT 
touch the shaded parts shown in the 
illustration.
 
 
 
eRemove the orange packing material 
and discard it.
Note
This step is only necessary when you are 
replacing the waste toner box for the first 
time. The orange packing is installed at 
the factory to protect your machine during 
shipment. The orange packing is not 
required for replacement waste toner 
boxes.
 
 
h
 
 

Troubleshooting and routine maintenance185
C
fHold the green handle of the waste toner 
box and remove the waste toner box 
from the machine.
 
CAUTION 
Handle the waste toner box carefully in 
case you accidentally spill or scatter toner. 
If toner scatters on your hands or clothes, 
wipe or wash it off with cold water at once.
 
Note
Discard the used waste toner box 
according to local regulations, keeping it 
separate from domestic waste. If you have 
questions, call your local waste disposal...

186
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. 
Repeat this for all the drum unit and 
toner cartridge assemblies.
 
 
C-Cyan M-Magenta Y-Yellow K-Black
jClose the top cover of the machine.
Replacing periodic 
maintenance parts
C
The periodic maintenance parts will need to 
be replaced regularly to maintain the print 
quality. The parts listed below will have to be 
replaced after...

Troubleshooting and routine maintenance187
C
Machine InformationC
Checking the Serial NumberC
You can see the machine’s Serial Number on 
the LCD.
a(For MFC-9320CW) Press Menu, 8, 1.
(For MFC-9120CN) Press  Menu, 6, 1.
bPress  Stop/Exit .
Checking the Page CountersC
You can see the machine’s Page Counters 
for copies, printed pages, reports and lists, 
faxes or a summary total.
a(For MFC-9320CW) Press  Menu, 8, 2.
(For MFC-9120CN) Press  Menu, 6, 2.
bPress  a or  b to see  Total, Fax/List , 
Copy  or...

188
How to reset the machineC
a(for New Zealand) Press Menu, 0, 6.
Press  Menu, 0, 7.
 
Initial Setup
7.Reset
bPress  a or  b to choose the reset function 
you want to use.
Press  OK.
cDo one of the following;
„ To reset the settings, press  1 and go 
to step d.
„ To exit without making changes, 
press  2 and go to step e.
dYou will be asked to reboot the machine. 
Do one of the following;
„ To reboot the machine press  1. The 
machine will begin the reset.
„ To exit without rebooting the 
machine,...