Brother MFC-640CW - Manual (Page 160)

13 - 17 TROUBLESHOOTING AND ROUTINE MAINTENANCE
8
Press 2 (No) for Black or three colors
with a problem.
The LCD shows:
Press 1 (Yes).
The machine will start cleaning the
print head.
9
After cleaning is finished, press Color Start . The machine will
start printing the Print Quality Check Sheet again and then
return to Step 5.
10
Press Stop/Exit .
If you still see missing ink in this Print Quality Check Sheet, repeat
the cleaning and test print procedures at least five times. If ink is still
missing after the fifth cleaning and test print, replace the ink cartridge
for the clogged color. (Perhaps the ink cartridge was in your machine
over six months or the expiration date written on the cartridge
package has passed. Or, the ink may not have been stored properly
before use.)
After replacing the ink cartridge, check it by printing another Print
Quality Check Sheet. 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 (see Brother
numbers on page i).
Caution
Do NOT touch the print head. Touching the print head may cause
permanent damage and may void the print head’s warranty.
When a print head nozzle is
clogged the printed sample
looks like this. After the print head nozzle is
cleaned, the horizontal lines
are gone.
Start Cleaning?
1.Yes 2.No