Brother HL-4070CDW User Manual

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Troubleshooting

163

7

Color misregistration

 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 91) or perform the manual color registration by using the

control panel (see Manual Registration on page 92).

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 106.)

 Put in a new belt unit. (See Replacing the belt unit on page 112.)

Uneven density appears

periodically across the page

 Identify the color that is uneven and put in a new toner cartridge for that color.

(See Replacing a toner cartridge on page 99.)

 Put in a new drum unit. (See Replacing the drum unit on page 106.)

Missing image at edge  Put in a new toner cartridge. (See Replacing a toner cartridge on page 99.)

 Put in a new drum unit. (See Replacing the drum unit on page 106.)

Missing image at thin line  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 42.)

Examples of poor print quality Recommendation

ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.

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Brother HL-4070CDW