Brother MFC 9970CDW User Manual

Page 153

Troubleshooting

145

White streaks or bands down
the page



Clean the scanner glass and scanner glass strip. (See Cleaning the
scanner glass on page 93.)



Wipe the laser scanner windows with a dry lint-free soft cloth. (See
Cleaning the laser scanner windows on page 94.)



Clean the drum unit. (See Cleaning the drum unit on page 102.)



Identify the missing colour and put in a new toner cartridge. (See
Replacing a Toner cartridge on page 66.)
To identify the colour of the toner cartridge, visit us at
http://solutions.brother.com/ to view our FAQs and troubleshooting
tips.

Coloured streaks or bands
down the page



Clean all four corona wires (one for each colour) inside the drum unit
by sliding the green tab. (See Cleaning the corona wires on page 98.)



Make sure the corona wire green tabs are at their home positions (a).



Clean the scanner glass and scanner glass strip. (See Cleaning the
scanner glass on page 93.)



Replace the toner cartridge that matches the colour of the streak or
band. (See Replacing a Toner cartridge on page 66.)
To identify the colour of the toner cartridge, visit us at
http://solutions.brother.com/ to view our FAQs and troubleshooting
tips.



Put in a new drum unit. (See Replacing the drum unit on page 73.)

Coloured lines across the page



If coloured lines appear at 30 mm intervals, replace the toner
cartridge that matches the colour of the line. (See Replacing a Toner
cartridge on page 66.)
To identify the colour of the toner cartridge, visit us at
http://solutions.brother.com/ to view our FAQs and troubleshooting
tips.



If coloured lines appear at 94 mm intervals, put in a new drum unit.
(See Replacing the drum unit on page 73.)

White spots or hollow print



Make sure that the media type settings in the printer driver and in the
machine's Paper Type menu match the type of paper you are using.
(See Acceptable paper and other print media on page 22 and Basic
tab in the Software User's Guide.)



Check the machine’ s environment. Conditions such as high humidity
can cause white spots or hollow print. (See Choosing a location in the
Safety and Legal Booklet.)



Clean the drum unit. (See Cleaning the drum unit on page 102.)

Examples of poor print
quality

Recommendation

ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.