IBM 4800-741 Hardware Service Guide - Page 44

Before, begin, Cables, connectors, headphones

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Updated July 14, 2008 Before you begin Before you begin any of the following procedures, follow these steps: 1. Switch the power OFF at the system unit. CAUTION: Never attempt to service this product with AC power present. Only apply AC power after the machine is fully assembled. 2. Disconnect the power cord from the external power source. 3. Remove any attached devices and I/O connections from the unit. 4. Establish personal grounding before touching the units. For more information, see "Federal Communications Commission (FCC) statement" on page 105. 5. Before servicing the inside of the machine and after you have removed the top cover, verify that no system board LEDs (red) are illuminated. A red LED indicates the presence of power; you must remove the AC power cord before continuing. Cables, connectors, and headphones The following tips will assist you when removing and replacing parts for the SurePOS 720. v All cables and connectors are keyed; therefore, you cannot insert a cable in an incorrect location. v When connecting a powered USB cable to the back of the unit, insert the connector with the latch on the bottom. A bottom latch allows for ease in disconnecting. For the front USB cables, insert the connector in the usual manner, with the latch on the top. Figure 15. Processor power cable v For Models 74* and 78*, installing a headphone overrides the line-out speaker. 26 SurePOS 700 Series: SurePOS 700-721/741/781, 722/742/782 Hardware Service Guide

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Before
you
begin
Before
you
begin
any
of
the
following
procedures,
follow
these
steps:
1.
Switch
the
power
OFF
at
the
system
unit.
CAUTION:
Never
attempt
to
service
this
product
with
AC
power
present.
Only
apply
AC
power
after
the
machine
is
fully
assembled.
2.
Disconnect
the
power
cord
from
the
external
power
source.
3.
Remove
any
attached
devices
and
I/O
connections
from
the
unit.
4.
Establish
personal
grounding
before
touching
the
units.
For
more
information,
see
“Federal
Communications
Commission
(FCC)
statement”
on
page
105.
5.
Before
servicing
the
inside
of
the
machine
and
after
you
have
removed
the
top
cover,
verify
that
no
system
board
LEDs
(red)
are
illuminated.
A
red
LED
indicates
the
presence
of
power;
you
must
remove
the
AC
power
cord
before
continuing.
Cables,
connectors,
and
headphones
The
following
tips
will
assist
you
when
removing
and
replacing
parts
for
the
SurePOS
720.
v
All
cables
and
connectors
are
keyed;
therefore,
you
cannot
insert
a
cable
in
an
incorrect
location.
v
When
connecting
a
powered
USB
cable
to
the
back
of
the
unit,
insert
the
connector
with
the
latch
on
the
bottom.
A
bottom
latch
allows
for
ease
in
disconnecting.
For
the
front
USB
cables,
insert
the
connector
in
the
usual
manner,
with
the
latch
on
the
top.
v
For
Models
74*
and
78*,
installing
a
headphone
overrides
the
line-out
speaker.
Figure
15.
Processor
power
cable
Updated
July
14,
2008
26
SurePOS
700
Series:
SurePOS
700-721/741/781,
722/742/782
Hardware
Service
Guide