Lenovo B50-45 Hardware Maintenance Manual - Lenovo B50-xx, B50-30 Touch Notebo - Page 9

Safety inspection guide

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Lenovo B50-30/B50-30 Touch/B50-45/B50-70 Safety inspection guide The purpose of this inspection guide is to assist you in identifying potential unsafe conditions. As each machine was designed and built, required safety items were installed to protect users and service personnel from injury. This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non‐Lenovo features or options not covered by this inspection guide. If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem. Consider these conditions and the safety hazards they present: • Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal electrical shock) • Explosive hazards, such as a damaged CRT face or a bulging capacitor • Mechanical hazards, such as loose or missing hardware To determine whether there are any potential unsafe conditions, use the following checklist at the beginning of every service task. Begin the checks with the power off, and the power cord disconnected. Checklist: 1. Check exterior covers for damage (loose, broken, or sharp edges). 2. Turn off the computer. Disconnect the power cord. 3. Check the power cord for: a. A third‐wire ground connector in good condition. Use a meter to measure third‐wire ground continuity for 0.1 ohm or less between the external ground pin and the frame ground. b. The power cord should be the type specified in the parts list. c. Insulation must not be frayed or worn. 4. Check for cracked or bulging batteries. 5. Remove the cover. 6. Check for any obvious non‐Lenovo alterations. Use good judgment as to the safety of any non‐Lenovo alterations. 7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage. 8. Check for worn, frayed, or pinched cables. 9. Check that the power‐supply cover fasteners (screws or rivets) have not been removed or tampered with. 5

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Lenovo B50-30/B50-30 Touch/B50-45/B50-70
5
The
 
purpose
 
of
 
this
 
inspection
 
guide
 
is
 
to
 
assist
 
you
 
in
 
identifying
 
potential
 
unsafe
 
conditions.
 
As
 
each
 
machine
 
was
 
designed
 
and
 
built,
 
required
 
safety
 
items
 
were
 
installed
 
to
 
protect
 
users
 
and
 
service
 
personnel
 
from
 
injury.
 
This
 
guide
 
addresses
 
only
 
those
 
items.
 
You
 
should
 
use
 
good
 
judgment
 
to
 
identify
 
potential
 
safety
 
hazards
 
due
 
to
 
attachment
 
of
 
non
‐
Lenovo
 
features
 
or
 
options
 
not
 
covered
 
by
 
this
 
inspection
 
guide.
If
 
any
 
unsafe
 
conditions
 
are
 
present,
 
you
 
must
 
determine
 
how
 
serious
 
the
 
apparent
 
hazard
 
could
 
be
 
and
 
whether
 
you
 
can
 
continue
 
without
 
first
 
correcting
 
the
 
problem.
Consider
 
these
 
conditions
 
and
 
the
 
safety
 
hazards
 
they
 
present:
•
Electrical
 
hazards,
 
especially
 
primary
 
power
 
(primary
 
voltage
 
on
 
the
 
frame
 
can
 
cause
 
serious
 
or
 
fatal
 
electrical
 
shock)
•
Explosive
 
hazards,
 
such
 
as
 
a
 
damaged
 
CRT
 
face
 
or
 
a
 
bulging
 
capacitor
•
Mechanical
 
hazards,
 
such
 
as
 
loose
 
or
 
missing
 
hardware
To
 
determine
 
whether
 
there
 
are
 
any
 
potential
 
unsafe
 
conditions,
 
use
 
the
 
following
 
checklist
 
at
 
the
 
beginning
 
of
 
every
 
service
 
task.
 
Begin
 
the
 
checks
 
with
 
the
 
power
 
off,
 
and
 
the
 
power
 
cord
 
disconnected.
Checklist:
1.
Check
 
exterior
 
covers
 
for
 
damage
 
(loose,
 
broken,
 
or
 
sharp
 
edges).
2.
Turn
 
off
 
the
 
computer.
 
Disconnect
 
the
 
power
 
cord.
3.
Check
 
the
 
power
 
cord
 
for:
a.
A
 
third
‐
wire
 
ground
 
connector
 
in
 
good
 
condition.
 
Use
 
a
 
meter
 
to
 
measure
 
third
‐
wire
 
ground
 
continuity
 
for
 
0.1
 
ohm
 
or
 
less
 
between
 
the
 
external
 
ground
 
pin
 
and
 
the
 
frame
 
ground.
b.
The
 
power
 
cord
 
should
 
be
 
the
 
type
 
specified
 
in
 
the
 
parts
 
list.
c.
Insulation
 
must
 
not
 
be
 
frayed
 
or
 
worn.
4.
Check
 
for
 
cracked
 
or
 
bulging
 
batteries.
5.
Remove
 
the
 
cover.
6.
Check
 
for
 
any
 
obvious
 
non
‐
Lenovo
 
alterations.
 
Use
 
good
 
judgment
 
as
 
to
 
the
 
safety
 
of
 
any
 
non
‐
Lenovo
 
alterations.
7.
Check
 
inside
 
the
 
unit
 
for
 
any
 
obvious
 
unsafe
 
conditions,
 
such
 
as
 
metal
 
filings,
 
contamination,
 
water
 
or
 
other
 
liquids,
 
or
 
signs
 
of
 
fire
 
or
 
smoke
 
damage.
8.
Check
 
for
 
worn,
 
frayed,
 
or
 
pinched
 
cables.
9.
Check
 
that
 
the
 
power
‐
supply
 
cover
 
fasteners
 
(screws
 
or
 
rivets)
 
have
 
not
 
been
 
removed
 
or
 
tampered
 
with.
Safety inspection guide