11 - 18; Black toner marks across the page; White lines across the page- Page 105
Brother MFC-7420 User's Guide
Table of Contents
Troubleshooting and routine maintenance
11 - 18
11
Black toner marks across the page
The drum unit may be damaged. Put in a new drum unit (See
Make sure that you use paper that meets our specifications. (See
If you use label sheets for laser printers, the glue from the sheets may sometimes
stick to the OPC drum surface. Clean the drum unit. (See
Do not use paper that has clips or staples because they will scratch the surface of
the drum.
If the unpacked drum unit is in direct sunlight or room light, the unit may be
damaged.
White lines across the page
Make sure that you use paper that meets our specifications. A rough surfaced
paper or thick print media can cause the problem.
Make sure that you choose the appropriate media type in the printer driver or in
the MFCās Paper Type menu setting. (See
on page 1-9 and
Basic tab
in the Software Userās Guide on the CD-ROM.)
The problem may disappear by itself. Print multiple pages to clear this problem,
especially if the MFC has not been used for a long time.
The drum unit may be damaged. Put in a new drum unit. (See
Lines across the page
Clean the inside of the MFC and the primary corona wire in the drum unit.
(See
The drum unit may be damaged. Put in a new drum unit. (See
Black lines down the page
Printed pages have toner stains down
the page.
Clean the primary corona wire of the drum unit.
Make sure the primary corona wireās blue tab is at the home position (
ā²
).
The drum unit may be damaged. Install a new drum unit. (See
The toner cartridge may be damaged. Put in a new toner cartridge. (See
on page 11-25.) Make sure that a torn piece of paper
is not inside the MFC covering the laser scanner window.
The fixing unit may be smudged. Call Brother Customer Service at
1-800-284-4329 (
in USA
) or 1-877-BROTHER (
in Canada
).
White lines down the page
You may clear the problem by wiping the laser scanner window with a soft cloth.
(See
Cleaning the laser scanner window
The toner cartridge may be damaged. Put in a new toner cartridge.
(See
Replacing the toner cartridge (TN-350)
Page skewed
Make sure the paper or other print media is loaded properly in the paper tray and
that the guides are not too tight or too loose against the paper stack.
Set the paper guides correctly.
If you are using the manual feed slot, see
To load paper or other media in the
The paper tray may be too full.
Check the paper type and quality. (See
Examples of poor print quality
Recommendation
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
ABCDE
FGH
abcdefg
hijk
A B C D
a b c d e
0 1 2 3 4
Detailed Information for Brother MFC-7420 User's Guide
Lists of information found in Brother MFC-7420 User's Guide - Page 105
- 9.) If you use label sheets for laser printers, the glue from the sheets may sometimes stick to the OPC drum surface.
- 17.) Do not use paper that has clips or staples because they will scratch the surface of the drum.
- 28.) Lines across the page Clean the inside of the MFC and the primary corona wire in the drum unit.
- 24.) The drum unit may be damaged.
- 28.) Black lines down the page Printed pages have toner stains down the page.
- 28.) The toner cartridge may be damaged.
- 25.) Make sure that a torn piece of paper is not inside the MFC covering the laser scanner window.
- 23.) The toner cartridge may be damaged.
- 25.) Page skewed Make sure the paper or other print media is loaded properly in the paper tray and that the guides are not too tight or too loose against the paper stack.
- 12. The paper tray may be too full.
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