Brother International MFC-7050C Service Manual - Page 124

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[5] Print-image related If the received or sent image has any problem, first make a copy with the facsimile equipment. If the copied image is normal, the problem may be due to the remote terminal; if it is abnormal, proceed to the following checks: Trouble (1) Completely blank Action to be taken At the scanner Check the following components: - CIS harness - Main PCB - CIS unit (2) Random color (3) All black At the printer • Check each of the ink cartridges to confirm that the transparent tape covering the print head is removed. • Check that the ink cartridges has not run out of ink. • Check the dimple contacts between the print heads embedded in the Ink cartridges and the FPC on the carrier. Clean them if contaminated. (If the problem persists, replace the carrier ASSY.) • 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. At the scanner Check the following components: - CIS harness - CIS unit - Main PCB At the printer Check the following components: - Print heads embedded in the ink cartridges - Main PCB - Carrier ASSY (Replace the carrier ASSY.) - 7

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[5]
Print
-image
related
If
the
received
or
sent
image
has
any
problem,
first
make
a
copy
with
the
facsimile
equipment.
If
the
copied
image
is
normal,
the
problem
may
be
due
to
the
remote
terminal;
if
it
is
abnormal,
proceed
to
the
following
checks:
Trouble
Action
to
be
taken
(1)
Completely
blank
At
the
scanner
Check
the
following
components:
-
CIS
harness
-
Main
PCB
-
CIS
unit
At
the
printer
(2)
Random
color
•
Check
each
of
the
ink
cartridges
to
confirm
that
the
transparent
tape covering
the
print
head
is
removed.
•
Check
that
the
ink
cartridges
has
not
run
out
of
ink.
•
Check
the
dimple
contacts
between
the
print
heads
embedded
in
the
Ink
cartridges
and
the
FPC
on
the
carrier.
Clean
them
if
contaminated.
(If
the
problem
persists,
replace
the
carrier
ASSY.)
•
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.
(3)
All
black
At
the
scanner
Check
the
following
components:
-
CIS
harness
-
CIS
unit
-
Main
PCB
At
the
printer
Check
the
following
components:
-
Print
heads
embedded
in
the
ink
cartridges
-
Main
PCB
-
Carrier
ASSY
(Replace
the
carrier
ASSY.)
-
7