Brother HL-4040CN User Manual page 169

Examples of poor print quality
Color misregistration
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 edge
Missing image at thin line
Recommendation
Make sure that the drum unit is installed properly.
Make sure that the belt unit is installed properly.
Make sure that the waste toner box is installed properly.
Perform the auto color registration by using the control panel (see Auto
Registration on page 88) or perform the manual color registration by using the
control panel (see Manual Registration on page 89).
If the color mis-registration is not corrected after registering the color
manually, take all the toner cartridges out of the drum unit and turn the drum
unit over, then make sure that four drum unit gears are in the home position.
The home position of each drum can be identified by matching the number on
the drum unit gear to the same number on the side of the drum unit as shown
in the illustration.
Put in a new drum unit. (See Replacing the drum unit on page 103.)
Put in a new belt unit. (See Replacing the belt unit on page 109.)
Put in a waste toner box. (See Replacing the waste toner box on page 114.)
Identify the color that is uneven and put in a new toner cartridge for that color.
(See Replacing a toner cartridge on page 96.)
Put in a new drum unit. (See Replacing the drum unit on page 103.)
Put in a new toner cartridge. (See Replacing a toner cartridge on page 96.)
Put in a new drum unit. (See Replacing the drum unit on page 103.)
If you use Windows printer driver, choose Improve pattern printing or Improve
Thin Line in Print Setting of Advanced tab. (See Device Options on page 41.)
Troubleshooting
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