Brother International MFC-7050C Service Manual - Page 127

driven printing

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Trouble (10) White horizontal streaks Action to be taken • 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. • Replace the ink cartridge(s). • Check the paper feed-related rollers. (11) Stained leading edge of recording paper At the printer • Clean the nozzle ends of the ink-jet print heads embedded in the ink cartridges. [ 6 ] PC-driven or video capture-driven printing Trouble Check: (1) PC-driven printing is impossible. (2) Video capture-driven printing is impossible (3) Video printing is impossible. • Interface with the host computer • PC interface cable • Main PCB • Centronics interface • Interface PCB • Centro harnesses (1 and 2), connecting the interface PCB and main PCB with each other • Video PCB • Main PCB • Interface PCB • Centro harnesses (1 and 2), connecting the interface PCB and main PCB with each other • Video PCB • Main PCB VI - 10

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Trouble
Action
to
be
taken
(10)
White
horizontal
streaks
•
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.
•
Replace
the
ink
cartridge(s).
•
Check
the
paper
feed
-related
rollers.
(11)
Stained
recording
leading
edge
paper
of
At
the
printer
•
Clean
the
nozzle
ends
of
the
ink
-jet
print
heads
embedded
in
the
ink
cartridges.
[
6
]
PC
-driven
or
video
capture
-driven
printing
Trouble
Check:
(1)
PC
-driven printing
is
impossible.
•
Interface
with
the
host
computer
•
PC
interface
cable
•
Main
PCB
•
Centronics
interface
•
Interface
PCB
•
Centro
harnesses
(1
and
2),
connecting
the
interface
PCB
and
main
PCB
with
each
other
(2)
Video
capture
-driven
printing
is
impossible
•
Video
PCB
•
Main
PCB
•
Interface
PCB
•
Centro
harnesses
(1
and
2),
connecting
the
interface
PCB
and
main
PCB
with
each
other
(3)
Video
printing
is
impossible.
•
Video
PCB
•
Main
PCB
VI
-
10