TROUBLESHOOTING PROCEDURES
16-16
MFC 4550/6550MC/7550MC
OP-US-5.0
Maintenance
Recommendation
If
toner
scattered
over
the
whole
printing
surface,
adjust
the
density
dial
inside
the
printer
counterclockwise.
See
“The
is
too
Light
or
too
Dark”on
Clean
the
machine
interior.
See
“Regular
Maintenance”
and
“Cleaning
the
Drum
Make
sure
that
you
use
paper
that
meets
specifications
See
page
If
you
still
have
the
same
problem
and
the
display
shows
CHANGE
DRUM,
replace
the
drum
unit
with
a
new
one.
Wipe
the
electric
terminals
Also,
do
not
use
heat-sensitive
paper
as
it
will
cause
this
problem.
If
the
same
problem
occurs
and
the
display
shows
CHANGE
DRUM,
on
after
cleaning,
replace
the
drum
unit
with
a
new
one.
• Make
sure
that
the
toner
cartridge
is
not
empty.
• Wipe
the
electric
terminals
referring
to
“Regular
Maintenance”
and
“Cleaning
the
Drum
• Make
sure
that
a
torn
piece
of
paper
does
not
remain
on
the
scanner
window.
The
problem
may
disappear
by
itself.
Try
copying
multiple
pages
to
clear
this
problem.
This
may
occur
if
the
machine
has
not
been
used
for
a
long
time.
This
also
may
occur
if
the
surface
of
the
drum
is
scratched.
You
must
then
replace
the
drum
unit
with
a
new
one.
If
the
problem
does
not
disappear,
it
may
be
that
the
drum
was
marked
or
damaged
by
excessive
exposure
to
light.
In
this
case,
replace
the
drum
unit
with
a
new
one.
The whole page is
printed
in
black.
Toner
scatters
and
stains
the
printed
page.
Question
Nothing
is
printed
on
the
page.
Printed pages are
marked at regular
intervals.
Example of Regular
Marking
Scattering Toner
Black Page
White page