Brother 7840 W User Guide

Troubleshooting and routine maintenance91
B
Menu access difficulties
DifficultiesSuggestions
The machine beeps when you try to 
access the Setup Receive and 
Setup Send menus. If the Fax
 key 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 quality difficulties
DifficultiesSuggestions
Vertical black line appears in 
copies. Black vertical lines on copies
 are...

92
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 area on the top and bottom of the page. Adjust the top and 
bottom margins in your document to allow for this.
Scanning difficulties
DifficultiesSuggestions
TWAIN errors appear while 
scanning. Make sure that the Brother TWAIN driver is chosen as the primary source. In 
PaperPort™ 11SE, click 
File, Scan or Get Photo  and choose the Brother 
TWAIN driver .
OCR...

Troubleshooting and routine maintenance93
B
Print quality difficulties
DifficultiesSuggestions
Printed pages are curled. „Low quality thin or thick paper or not printing on the recommended side of the 
paper could cause this problem. Try turning over the stack of paper in the 
paper tray.
„ Make sure that you choose the Paper Type that suits the print media type you 
are using. (See Acceptable paper and other print media on page 14.)
Printed  pages  are  smeared. The Paper Type setting may be in correct...

94
The network scanning feature 
does not work.
The network PC Fax Receive 
feature does not work.
The network printing feature does 
not work.(For Windows® only) The firewall setting on your PC may be rejecting the 
necessary network connection. Follow t he 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.
For Windows
® XP SP2 users:
aClick the  Start button,  Control...

Troubleshooting and routine maintenance95
B
The network scanning feature 
does not work.
The network PC Fax Receive 
feature does not work.
The network printing feature does 
not work.
(continued)For Windows Vista® users:
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:...

96
Improving the print qualityB
Examples of poor print 
qualityRecommendation
 
White lines across the page„
Make sure that you use paper that meets our specifications. A rough 
surfaced paper or thick print media can cause the problem. (See 
Acceptable paper and other print media  on page 14.)
„ Make sure that you choose the appropriate media type in the printer 
driver or in the machine’s Paper Type menu setting. (See  Acceptable 
paper and other print media  on page 14 and Basic tab in the Software...

Troubleshooting and routine maintenance97
B
 
Page skewed„
Make sure that the paper or other  print media is loaded correctly in 
the paper tray and that the guides  are not too tight or too loose 
against the paper stack.
„ Set the paper guides correctly. (See  Loading paper in the paper tray 
on page 9.)
„ The paper tray may be too full.
„ If you are using the manual feed slot, see  Loading paper in the 
manual feed slot  on page 10.
„ Check the paper type and quality. (See  Acceptable paper and other...

98
 
Curled or wavy„
Check the paper type and quality. High temperatures and high 
humidity will cause paper to curl.
„ If you do not use the machine often, the paper may have been in the 
paper tray too long. Turn over the stack of paper in the paper tray. 
Also, fan the paper stack and then rotate the paper 180° in the paper 
tray.
 
White Spots on black text 
and graphics at 75 mm 
intervals
 
Black Spots at 75 mm intervals „
Make ten copies of a blank,  white sheet of paper. (See Making 
multiple...

Troubleshooting and routine maintenance99
B
 
Faint„
Check the machine’s environment. Conditions such as humidity, high 
temperatures, and so on, may cause this print fault. (See  Choosing a 
location  on page 80.)
„ If the whole page is too light, Toner Save mode may be on. Turn off 
Toner Save  mode in the machine menu settings or  Toner Save 
mode in the printer  Properties of the driver. (See  Toner Save 
on page 23 or  Advanced tab in the Software User’s Guide on the CD-
ROM .)
„ Clean the scanner...

100
 
Black toner marks across the page „
Make sure that you use paper that  meets our specifications. (See 
Acceptable paper and other print media  on page 14.)
„ If you use label sheets for laser machines, the glue from the sheets 
may sometimes stick to the OPC drum  surface. Clean the drum unit. 
(See  Cleaning the drum unit  on page 120.)
„ Do not use paper that has clips or  staples because they will scratch 
the surface of the drum.
„ If the unpacked drum unit is in direct sunlight or room light,...