Brother MFC 9120CN User Manual

Troubleshooting and routine maintenance129
C
Menu access difficulties
DifficultiesSuggestions
The machine beeps when you try to 
access the Setup Receive and 
Setup Send menus. If 
Fax  is not illuminated, press it to turn on Fax mode. The Setup Receive 
setting ( Menu, 2 , 1 ) and Setup Send setting ( Menu, 2 , 2 ) are available only when 
the machine is in Fax mode.
Copy difficulties
DifficultiesSuggestions
Cannot make a copy. „Make sure that  Copy is illuminated. (See  Entering copy mode 
on page...

130
The machine prints the first couple 
of pages correctly, then some 
pages have text missing.„
Check the settings in your application to make sure that it is set up to work with 
your machine.
„ Your computer is not recognising the machine’s input buffer’s full signal. Make 
sure that you connected the interface cable correctly. (See the  Quick Setup 
Guide .)
The headers or footers appear 
when the document displays on the 
screen but they do not show up 
when it is printed. There is an unprintable...

Troubleshooting and routine maintenance131
C
The machine does not feed paper 
from the manual feed slot.„
Make sure that  Manual is chosen in the printer driver.
„ Make sure the paper or print media is loaded correctly in the manual feed slot. 
See  Loading paper in the manual feed slot  on page 12.
How do I print on envelopes? You can load envelopes from the manual feed slot. Your application must be set  up to print the envelope size you are using. This is usually done in the Page Setup 
or Document...

132
The network scanning feature 
does not work.
The network PC Fax Receive 
feature does not work.
The network printing feature does 
not work.(Windows®) The firewall setting on your PC may be rejecting the necessary 
network connection. Follow the instructions below to configure Windows
® 
Firewall. If you are using other personal firewall software, see the User’s Guide 
for your software or contact the software manufacturer.
 (Windows
® XP SP2)
aClick the  Start button,  Control Panel , Network and...

Troubleshooting and routine maintenance133
C
The network scanning feature 
does not work.
The network PC Fax Receive 
feature does not work.
The network printing feature does 
not work.
(continued)(Windows Vista®)
aClick the 
Start button,  Control Panel , Network and Internet , Windows 
Firewall  and click  Change settings .
bWhen the User Account Control  screen appears, do the following.
„ Users who have administrator rights: Click  Continue.
„ For users who do not have administrator rights: Enter...

134
Improving the print qualityC
If you have a print quality problem, print a test page first (Menu, 4 , 2 , 3 ). If the printout looks good, 
the problem is probably not the machine. Check the interface cable connections or try printing a 
different document. If the printout or test page printed from the machine has a quality problem, 
check the following steps first. And then, if you still have a print quality problem, check the chart 
below and follow the recommendation.
aCheck that you use the paper...

Troubleshooting and routine maintenance135
C
White streaks or bands down 
the page
 
„Wipe the windows of all four LED heads with a dry lint free soft cloth. 
(See  Cleaning the LED heads  on page 157.)
„ Clean all four drum units. (See  Cleaning the drum unit on page 159.)
„ Identify the missing colour and put in a new toner cartridge. (See 
Replacing a Toner cartridge  on page 168.)
You may only need to replace one toner cartridge to solve the print 
problem. To identify which toner cartridge needs to...

136
Coloured lines across the page
 
„If coloured lines appear at 30 mm intervals, replace the toner 
cartridge that matches the colour of the line. (See  Replacing a Toner 
cartridge  on page 168.)
„ If coloured lines appear at 94 mm intervals, put in a new drum unit 
that matches the colour of the line. (See  Replacing the drum units 
on page 174.)
White spots or hollow print
 
„ If the problem is not solved after printing a few pages, the drum unit 
may be stained. Clean all four drum units. (See...

Troubleshooting and routine maintenance137
C
Toner scatter or toner stain
 
„Check the machine’s environment. Conditions such as high humidity 
and high temperatures may cause this print quality problem. (See  To 
use the machine safely  on page 109.)
„ Identify the colour causing the problem and put in a new toner 
cartridge. (See  Replacing a Toner cartridge  on page 168.)
You may only need to replace one toner cartridge to solve the print 
problem. To identify which toner cartridge needs to be...

138
All one colour
 
„Identify the colour causing the problem and put in a new drum unit. 
(See  Replacing the drum units  on page 174.)
You may only need to replace one drum unit to solve the print 
problem. To identify which drum needs to be replaced, please visit us 
at http://solutions.brother.com/
 to view our FAQs and troubleshooting 
tips.
Colour misregistration
 
„ Make sure that the machine is on a solid level surface.
„ Perform the auto colour registration using the control panel (see  Auto...