Brother International HL 1850 Service Manual - Page 103

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HL-1850/1870N SERVICE MANUAL CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY 1. SAFETY PRECAUTIONS To avoid creating secondary problems by mishandling, follow the warnings and precautions below during maintenance work. A WARNING (1) Always turn off the power switch and unplug the power cord from the power outlet before accessing any parts inside the printer. (2) Some parts inside the printer are extremely hot immediately after the printer is used. When opening the front cover or rear cover to access any parts inside the printer, never touch the red coloredparts shown in the following figures. A L ' h e 0 CAUTION: (1) Be careful not to lose screws, washers, or other parts removed. (2) Be sure to apply grease to the gears and applicable positions specified in this chapter. (3) When using soldering irons or other heat-generating tools, take care not to accidentally damage parts such as wires, PCBs and covers. (4) Before handling any PCBs, touch a metal portion of the equipment to discharge any static electricity charge on your body, or the electronic parts or components may be damaged. (5) When transporting PCBs, be sure to wrap them in the correct protective packaging. (6) Be sure to replace self-tapping screws correctly, if removed. Unless otherwise specified, tighten screws to the following torque values. TAPTITE, BIND or CUP B M3: 70N • cm M4: 80N • cm TAPTITE, CUP S M3: 80N • cm SCREW M3: 70N • cm M4: 80N • cm (7) When connecting or disconnecting cable connectors, hold the connector body, not the cables. If the connector has a lock, release the connector lock first to release it (8) After a repair, check not only the repaired portion but also all connectors. Also check that other related portions are functioning properly before operational checks. 4-1

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HL
-1850/1870N
SERVICE
MANUAL
CHAPTER
4
DISASSEMBLY
AND
RE
-ASSEMBLY
1.
SAFETY
PRECAUTIONS
To
avoid
creating
secondary
problems
by
mishandling,
follow
the
warnings
and
precautions
below
during
maintenance
work.
A
WARNING
(1)
Always
turn
off
the
power
switch
and
unplug
the
power
cord
from
the
power
outlet
before
accessing
any
parts
inside
the
printer.
(2)
Some
parts
inside
the
printer
are
extremely
hot
immediately
after
the
printer
is
used.
When
opening
the
front
cover
or
rear
cover
to
access
any
parts
inside
the
printer,
never
touch
the
red
colored
parts
shown
in
the
following
figures.
A
L
'
h
e
0
CAUTION:
(1)
Be
careful
not
to
lose
screws,
washers,
or
other
parts
removed.
(2)
Be
sure
to
apply
grease
to
the
gears
and
applicable
positions
specified
in
this
chapter.
(
3
)
When
using
soldering
irons
or
other
heat
-generating
tools,
take
care
not
to
accidentally
damage
parts
such
as
wires,
PCBs
and
covers.
(4)
Before
handling
any
PCBs,
touch
a
metal
portion
of
the
equipment
to
discharge
any
static
electricity
charge
on
your
body,
or
the
electronic
parts
or
components
may
be
damaged.
(5)
When
transporting
PCBs,
be
sure
to
wrap
them
in
the
correct
protective
packaging.
(6)
Be
sure
to
replace
self
-tapping
screws
correctly,
if
removed.
Unless
otherwise
specified,
tighten
screws
to
the
following
torque
values.
TAPTITE,
BIND
or
CUP
B
M3:
70N
•
cm
M4:
80N
•
cm
TAPTITE,
CUP
S
M3:
80N
•
cm
SCREW
M3:
70N
•
cm
M4:
80N
•
cm
(7)
(
8
)
When
connecting
or
disconnecting
cable
connectors,
hold
the
connector
body,
not
the
cables.
If
the
connector
has
a
lock,
release
the
connector
lock
first
to
release
it
After
a
repair,
check
not
only
the
repaired
portion
but
also
all
connectors.
Also
check
that
other
related
portions
are
functioning
properly
before
operational
checks.
4-1