Brother MFC-9140CDN Basic User's Manual page 162

Examples of poor print quality
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Colour misregistration
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Uneven density appears
periodically across the page
W X Y Z
A
B
C
D
E
Missing thin lines in images
152
Recommendation

Make sure the machine is on a solid level surface.

Perform the auto colour registration using the Touchscreen
(see Auto Registration on page 112).

Identify the colour causing the problem and install a new
drum unit (see Replacing the drum units on page 83).
To identify the colour of the drum unit, visit us at
http://solutions.brother.com/ to view our FAQs and
troubleshooting tips.

Install a new belt unit (see Replacing the belt unit
on page 88).

Perform the calibration using the Touchscreen or the printer
driver (see Calibration on page 111).

Adjust the copy density and contrast if you are copying
(see Advanced User's Guide: Adjusting Density and
Contrast).

Clear the Improve Grey Colour check box in the printer
driver. (See Software User's Guide.)

Identify the colour causing the problem and put in a new
toner cartridge (see Replacing the toner cartridges
on page 75).
To identify the colour of the toner cartridge, visit us at
http://solutions.brother.com/ to view our FAQs and
troubleshooting tips.

Identify the colour causing the problem and install a new
drum unit (see Replacing the drum units on page 83).
To identify the colour of the drum unit, visit us at
http://solutions.brother.com/ to view our FAQs and
troubleshooting tips.

Make sure Toner Save mode is off in the Touchscreen or the
printer driver (see Software User's Guide).

Change the print resolution.

If you use a Windows printer driver, choose
Improve pattern printing in Print Setting of Basic tab
(see Software User's Guide).