Brother MFC4450 Owner's Manual page 147

MFC 4450/OP-US-5.0
If the Printed Pages are Still Blurred at the Center or Either Edge as Below
First, make sure that the printer is placed on a flat, horizontal surface.
If the problem still occurs, remove the drum unit with the toner cartridge installed.
Hold the unit horizontally with both hands and tap it firmly against a flat surface 3
or 4 times. Reinstall the drum unit with the toner cartridge and try printing again.
If the print quality is acceptable, you may continue using this drum unit. If the print
quality is not acceptable replace the drum unit. If streaks still occur, please contact
Brother Customer Service or your local Authorized Service Center for further
assistance.
Horizontal Streaks
You may get a fax with horizontal streaks or with missing lines. Usually this is caused
by a poor telephone connection. Ask the other party to send the fax again.
Poor Printing Quality
If the printing quality is not at an acceptable level, please replace your drum unit with
a new one.
The Print is too Light or too Dark
The print density dial is located in the
corner under the top cover. (Remove
the drum unit.) You can use it to
adjust print density by increasing or
decreasing the Print Density function
setting you chose.
The print may become darker or
lighter as conditions change (such as
changing the toner cartridge and
drum unit or if the MFC has become
overheated from heavy use).
Use a straight blade screwdriver to turn the print density dial clockwise for darker print
and counterclockwise for lighter print. The dial has been set to the middle position.
Make five or six copies to bring the toner up to the level of the new setting.
If the print is still too light, check to see if the Toner Save feature is ON (see page
6-9~10).
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Print density dial
14-5