Brother International MFC-7050C Service Manual - Page 126

contaminated.

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Trouble (7) Print edges not aligned Action to be taken At the printer • Check the alignment of vertical print lines by using the Ink management function. • Check the ink cartridges. (8) Ink splash At the printer • For each of the two ink-jet print heads, perform the head nozzle cleaning operation several times to remove dust or air bubbles from its nozzles. • Check the ink cartridges. Either of them has run out of ink or the ink viscosity has been increased, so replace it. • Replace the ink cartridge(s). • Replace the main PCB. • Replace the power supply PCB. • Replace the interface PCB. (9) Random missing dots - - At the printer • For each of the two ink-jet print heads, perform the head cleaning operation several times to remove dust or air bubbles from its nozzles. • Check the ink cartridges. If either of the cartridges has run out of ink, replace it. • Check the dimple contact between the print heads embedded in the ink cartridges and the FPC on the carrier. Clean it if contaminated. • Replace the ink cartridge(s). • Check the connection of the carrier flat cables on the main PCB. (If either of those cables is broken or damaged, replace the carrier ASSY.) • Replace the main PCB VI - 9

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Trouble
Action
to
be
taken
(7)
Print
edges
not
aligned
At
the
printer
•
Check
the
alignment
of
vertical
print
lines
by
using
the
Ink
management
function.
•
Check
the
ink
cartridges.
(8)
Ink
splash
At
the
printer
•
For
each
of
the
two
ink
-jet
print
heads,
perform
the
head
nozzle
cleaning
operation
several
times
to
remove
dust
or
air
bubbles
from
its
nozzles.
•
Check
the
ink
cartridges.
Either
of
them
has
run
out
of
ink
or
the
ink
viscosity
has
been
increased,
so
replace
it.
•
Replace
the
ink
cartridge(s).
•
Replace
the
main
PCB.
•
Replace
the
power
supply
PCB.
•
Replace
the
interface
PCB.
(9)
Random
missing
dots
At
the
printer
•
For
each
of
the
two
ink
-jet
print
heads,
perform
the
head
cleaning
operation
several
times
to
remove
dust
or
air
bubbles
from
its
nozzles.
•
Check
the
ink
cartridges.
If
either
of
the
cartridges
has
run
out
of
ink,
replace
it.
•
Check
the
dimple
contact
between
the
print
heads
embedded
in
the
ink
cartridges
and
the
FPC
on
the
carrier.
Clean
it
if
contaminated.
•
Replace
the
ink
cartridge(s).
•
Check
the
connection
of
the
carrier
flat
cables
on
the
main
PCB.
(If
either
of
those
cables
is
broken
or
damaged,
replace
the
carrier
ASSY.)
•
Replace
the
main
PCB
—
—
VI
-
9