Brother HL-4140CN User Manual page 169

Troubleshooting
Examples of poor print quality
Colour misregistration
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Uneven density appears
periodically across the page
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Missing image at thin line
Wrinkle
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Offset image
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Recommendation
 Make sure that the machine is on a solid level surface.
 Perform the auto colour registration using the control panel (see Auto
Registration on page 83) or perform the manual colour registration using the
control panel (see Manual Registration on page 84).
 Put in a new drum unit. (See Replacing the drum unit on page 102.)
 Put in a new belt unit. (See Replacing the belt unit on page 106.)
 Perform the calibration. (See Colour Calibration on page 83.)
 Identify the colour that is uneven and put in a new toner cartridge for that
colour. (See Replacing the toner cartridges on page 97.)
To identify the colour of the toner cartridge, visit us at
http://solutions.brother.com/ to view our FAQs and troubleshooting tips.
 Put in a new drum unit. (See Replacing the drum unit on page 102.)
 Make sure toner save mode is off in the control panel or the printer driver.
 Change the print resolution.
 If you use a Windows printer driver, choose Improve pattern printing or
Improve Thin Line in Print Setting of Basic tab. (See Settings Dialog
on page 32.)
 Change to the recommended type of paper. (See Recommended paper and
print media on page 2.)
 Make sure that the back cover is closed properly.
 Make sure that the two grey levers inside the back cover are in the up position.
 Make sure that the media type setting in the driver matches the type of paper
you are using. (See Type and size of paper on page 2.)
 Make sure that the media type setting in the driver matches the type of paper
you are using. (See Type and size of paper on page 2.)
Make sure that the two grey levers inside the back cover are in the up position.

 Check the machine's environment. Conditions such as low humidity and low
temperatures may cause this print quality problem.
 Put in a new drum unit. (See Replacing the drum unit on page 102.)
6
164