Brother MFC-J2510 Basic User's Manual page 114

f
The Touchscreen asks you if the print
quality is OK.
Do one of the following:
 If all lines are clear and visible, press
Yes to finish the Print Quality check
and go to step j.
 If you can see missing short lines as
shown below, press No.
OK
g
The Touchscreen asks you if the print
quality is OK for black and then the three
colours.
Press Yes or No.
h
The Touchscreen asks you if you want
to start cleaning.
Press OK.
The machine starts cleaning the print
head.
i
After the cleaning procedure is finished,
press OK.
The machine prints the Print Quality
Check Sheet again. Return to step e.
j
Press .
If you repeat this procedure at least five
times and the print quality is still poor,
replace the ink cartridge for the clogged
colour.
After replacing the ink cartridge, check
the print quality. If the problem still
exists, repeat the cleaning and test print
procedures at least five times for the
new ink cartridge. If ink is still missing,
call Brother customer service or your
local Brother dealer.
104
Poor
IMPORTANT
DO NOT touch the print head. Touching
the print head may cause permanent
damage and may void the print head's
warranty.
NOTE
When a print head nozzle is clogged, the
printed sample looks like this.
A4, Letter and Executive
A3, Ledger, Legal, A5, A6, envelopes,
Photo (10  15 cm), Photo L
(89  127 mm), Photo 2L (13  18 cm)
and Index Card (127  203 mm)
After the print head nozzle is cleaned, the
horizontal lines are gone.