Brother  HL-4140CN User Manual page 134

Examples of poor print
quality
Uneven density appears
periodically across the page
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Thin lines do not print
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
 Perform the calibration. (See Calibration on page 77.)
 Adjust the contrast or brightness when you are in copy mode. (See
Adjusting Contrast, Colour and Brightness in Chapter 3 of the
Advanced User's Guide.)
Identify the colour that is uneven and put in a new toner cartridge for

that colour. (See Replacing a Toner cartridge on page 35.)
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 42.)
 Make sure Toner Save mode is off in the control panel of the machine
or the printer driver.
 Change the print resolution.
 If you use a Windows
Improve Pattern Printing or Improve Thin Line in Settings from
the Basic tab. (See Settings Dialog in the Software User's Guide.)
 Change to the recommended type of paper. (See Recommended
paper and print media on page 20 .)
 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 settings in the printer driver and in the
machine's Paper Type menu matches the type of paper you are
using. (See Acceptable paper and other print media on page 20 and
Basic tab in the Software User's Guide.)
 Make sure that the media type settings in the printer driver and in the
machine's Paper Type menu matches the type of paper you are
using. (See Acceptable paper and other print media on page 20 and
Basic tab in the Software User's Guide.)
 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. (See
Choosing a location in the Safety and Legal Booklet.)
Put in a new drum unit. (See Replacing the drum unit on page 42.)

®
printer driver, choose
Troubleshooting
B
105