6 ] Pc-Driven Printing - Brother MFC4820C Service Manual

Trouble
(10) White horizontal streaks
(11) Stained leading edge of
recording paper
[ 6 ] PC-driven printing
Trouble
(1) PC-driven printing is
impossible.
• For each of the four ink colors, perform the head purging
operation several times to remove dust or air bubbles from its
nozzles.
• Replace the print head unit.
• Check the paper feed-related rollers.
• Clean the head caps and wiper of the purge unit with a
Rubycel stick. For the cleaning procedure, refer to "Cleaning
the purge unit" given on page 8-22.
At the printer
• Clean the nozzle ends of the ink-jet units.
• Check that the print head unit is installed to the carriage
correctly.
• Interface with the host computer
• Main PCB
• USB interface
8 -2 0
Action to be taken
Action to be taken