Brother MFC 990cw - Manual (Page 169)

Troubleshooting and Routine Maintenance
157
B
Cleaning the print head
B
To maintain print quality, the machine will
automatically clean the print head. You can
start the cleaning process manually if there is
a print quality problem.
Clean the print head and ink cartridges if you
get a horizontal line or blank text in the text or
graphics on your printed pages. You can
clean Black only, three colours at a time
(Cyan/Yellow/Magenta), or all four colours at
once.
Cleaning the print head consumes ink.
Cleaning too often uses ink unnecessarily.
CAUTION
DO NOT touch the print head. Touching the
print head may cause permanent damage
and may void the print head's warranty.
a
Press .
b
Press Cleaning.
c
Press Black, Color or All.
The machine cleans the print head.
When cleaning is finished, the machine
will go back to the Ready screen
automatically.
Note
If you clean the print head at least five
times and the print has not improved, try
installing a new Brother original
Innobella™ replacement cartridge for
each problem colour. Try cleaning the
print head again up to five more times. If
the print has not improved call your
Brother dealer.
Checking the print quality
B
If faded or streaked colours and text appear
on your output, some of the nozzles may be
clogged. You can check this by printing the
Print Quality Check Sheet and looking at the
nozzle check pattern.
a
Press .
b
Press Test Print.
c
Press Print Quality.
d
Press Colour Start.
The machine begins printing the Print
Quality Check Sheet.
e
Check the quality of the four colour
blocks on the sheet.
f
The LCD 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 to choose
No.
g
The LCD asks you if the print quality is
OK for black and three colours.
Press Yes or No.
h
The LCD asks you if you want to start
cleaning.
Press Colour Start.
The machine starts cleaning the print
head.
OK Poor