Brother International DCP-1400 Service Manual - Page 45

Disassembly/reassembly

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1. DISASSEMBLY/REASSEMBLY ■ Safety Precautions To prevent the creation of secondary problems by mishandling, observe the following precautions during maintenance work. (1) Unplug the power cord from the power outlet before accessing parts or units inside the machine. When having access to the power supply, be sure to unplug the power cord from the power outlet. (2) When servicing the optical system of the laser printing unit, be careful not to place screwdrivers or other reflective objects in the path of the laser beam. Be sure to take off any personal accessories such as wrist watches and rings before working on the printer. A reflected beam, though invisible, can permanently damage your eyes. (3) If the machine has been printing, allow the heat-fixing unit (inside this unit is a red-colored heater roller) sufficient time to cool down before starting maintenance jobs. It is HOT! (4) Be careful not to lose screws, washers, or other parts removed for parts replacement. (5) Do not remove gears from the document feed roller ASSY or document ejection roller ASSY if at all possible. Once removed, they will become unusable and new gears will have to be put back in. (6) When using soldering irons and other heat-generating tools, take care not to damage the resin parts such as wires, PCBs, and covers. (7) Before handling the PCBs, touch a metal portion of the machine to discharge static electricity; otherwise, the electronic parts may be damaged due to the electricity charged in your body. (8) When transporting PCBs, be sure to wrap them in conductive sheets such as aluminum foil. (9) Be sure to reinsert self-tapping screws correctly, if removed. Unless otherwise specified, tighten screws to the following torque values: Taptite, bind B and cup B M3: 0.7 N•m M4: 0.8 N•m Taptite, cup S M3: 0.8 N•m Other screws M3: 0.7 N•m M4: 0.8 N•m (10) When connecting or disconnecting cable connectors, hold the connector bodies not the cables. If the connector has a lock, always slide the connector lock to unlock it. (11) Before reassembly, apply the specified lubricant to the specified points. (Refer to Section 2 in this chapter.) (12) After repairs, check not only the repaired portion but also that the connectors and other related portions function properly before operation checks. IV - 1

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1.
DISASSEMBLY/REASSEMBLY
■
Safety
Precautions
To
prevent
the
creation
of
secondary
problems
by
mishandling,
observe
the
following
precautions
during
maintenance
work.
(1)
Unplug
the
power
cord
from
the
power
outlet
before
accessing
parts
or
units
inside
the
machine.
When
having
access
to
the
power
supply,
be
sure
to
unplug
the
power
cord
from
the
power
outlet.
(2)
When
servicing
the
optical
system
of
the
laser
printing
unit,
be
careful
not
to
place
screwdrivers
or
other
reflective
objects
in
the
path
of
the
laser
beam.
Be
sure
to
take
off
any
personal
accessories
such
as
wrist
watches
and
rings
before
working
on
the
printer.
A
reflected
beam,
though
invisible,
can
permanently
damage
your
eyes.
(3)
If
the
machine
has
been
printing,
allow
the
heat
-fixing
unit
(inside
this
unit
is
a
red
-colored
heater
roller)
sufficient
time
to
cool
down
before
starting
maintenance
jobs.
It
is
HOT!
(4)
Be
careful
not
to
lose
screws,
washers,
or
other
parts
removed
for
parts
replacement.
(5)
Do
not
remove
gears
from
the
document
feed
roller
ASSY
or
document
ejection
roller
ASSY
if
at
all
possible.
Once
removed,
they
will
become
unusable
and
new
gears
will
have
to
be
put
back
in.
(6)
When
using
soldering
irons
and
other
heat
-generating
tools,
take
care
not
to
damage
the
resin
parts
such
as
wires,
PCBs,
and
covers.
(7)
Before
handling
the
PCBs,
touch
a
metal
portion
of
the
machine
to
discharge
static
electricity;
otherwise,
the
electronic
parts
may
be
damaged
due
to
the
electricity
charged
in
your
body.
(8)
When
transporting
PCBs,
be
sure
to
wrap
them
in
conductive
sheets
such
as
aluminum
foil.
(9)
Be
sure
to
reinsert
self
-tapping
screws
correctly,
if
removed.
Unless
otherwise
specified,
tighten
screws
to
the
following
torque
values:
Taptite,
bind
B
and
cup
B
M3:
0.7
N•m
M4:
0.8
N•m
Taptite,
cup
S
M3:
0.8
N•m
Other
screws
M3:
0.7
N•m
M4:
0.8
N•m
(10)
When
connecting
or
disconnecting
cable
connectors,
hold
the
connector
bodies
not
the
cables.
If
the
connector
has
a
lock,
always
slide
the
connector
lock
to
unlock
it.
(11)
Before
reassembly,
apply
the
specified
lubricant
to
the
specified
points.
(Refer
to
Section
2
in
this
chapter.)
(12)
After
repairs,
check
not
only
the
repaired
portion
but
also
that
the
connectors
and
other
related
portions
function
properly
before
operation
checks.
IV
-
1