Lenovo ThinkCentre A35 Hardware Service Manual - Page 61

Safety inspe, tion guide

Get Lenovo ThinkCentre A35 PDF manuals and user guides View all Lenovo ThinkCentre A35 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 61 highlights

w!Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds. w!Do not touch live electric al circuits with the reflective surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage. w!Do not service the following parts with the power on when they are removed from their normal operating places in a machine: - Power supply units - Pumps - Blowers and fans - Motor generators and similar units. (This practice ensures correct grounding of the units.) w!If an electrica.l accident occurs: - Use caution; do not become a victim yourself. - Switch off power. - Send another person to get medical aid. Safety inspection guide The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these products. Each machine, as it was designed and built, had required safety items installed to protect users and service personnel from injury. This guide addresses only those items. However, good judgment should be used to identify potential safety hazards due to attachment of non-IBM 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: w!Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal electrical shock). w!Explosive hazards, such as a damaged CRT face or bulging capacitor w!Mechanical hazards, such as loose or missing hardware The guide consists of a series of steps presented in a checklist Begin the checks with the power off, and the power cord disconnected. Checklist: 1. Check exterior covers for damage (loose, broken, or sharp edges). 3/ Power-off the computer. Disconnect the power cord. ! 4/ 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 frame ground. b. The power cord should be the appropriate type as specified in the parts listings. c. Insulation must not be frayed or worn. 4. Remove the cover. 5. Check for any obvious non-IBM alterations. Use good judgment as to the safety of any non-IBM alterations. 6. 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. 7. Check for worn, frayed, or pinched cables. 60

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
60
A
lw
a
y
s
l
ook carefu
lly
for possib
l
e hazards in
y
our
w
ork area. Examp
l
es of these hazards are moist f
l
oors,
nongrounded po
w
er extension cab
l
es, po
w
er surges, and missing safet
y
grounds.
Do not touch
l
i
v
e e
l
ectric a
l
circuits
w
ith the ref
l
ecti
v
e surface of a p
l
astic denta
l
mirror. The surface is
conducti
v
e; such touching can cause persona
l
injur
y
and machine damage.
Do not ser
v
ice the fo
ll
o
w
ing parts
w
ith the po
w
er on
w
hen the
y
are remo
v
ed from their norma
l
operating
p
l
aces in a machine: – Po
w
er supp
ly
units – Pumps – B
l
o
w
ers and fans – Motor generators and simi
l
ar
units. (This practice ensures correct grounding of the units.)
If an e
l
ectrica.
l
accident occurs: – Use caution; do not become a
v
ictim
y
ourse
l
f. –
Sw
itch off po
w
er. –
S
end another person to get medica
l
aid.
Safety inspe
c
tion guide
The intent of this inspection guide is to assist
y
ou in identif
y
ing potentia
lly
unsafe conditions on these
products. Each machine, as it
w
as designed and bui
l
t, had required safet
y
items insta
ll
ed to protect users and
ser
v
ice personne
l
from injur
y
. This guide addresses on
ly
those items. Ho
w
e
v
er, good judgment shou
l
d be
used to identif
y
potentia
l
safet
y
hazards due to attachment of non-IBM features or options not co
v
ered b
y
this inspection guide.
If an
y
unsafe conditions are present,
y
ou must determine ho
w
serious the apparent hazard cou
l
d be and
w
hether
y
ou can continue
w
ithout first correcting the prob
l
em.
Consider these conditions and the safet
y
hazards the
y
present:
E
l
ectrica
l
hazards, especia
lly
primar
y
po
w
er (primar
yv
o
l
tage on the frame can cause serious or fata
l
e
l
ectrica
l
shock).
Exp
l
osi
v
e hazards, such as a damaged CRT face or bu
l
ging capacitor
Mechanica
l
hazards, such as
l
oose or missing hard
w
are
The guide consists of a series of steps presented in a check
l
ist Begin the checks
w
ith the po
w
er off, and the
po
w
er cord disconnected.
Check
l
ist:
1.
Check exterior co
v
ers for damage (
l
oose, broken, or sharp edges).
Po
w
er-off the computer. Disconnect the po
w
er cord.
Check the po
w
er cord for:
a
.
A third-
w
ire ground connector in good condition. Use a meter to measure third-
w
ire ground
continuit
y
for 0.1 ohm or
l
ess bet
w
een the externa
l
ground pin and frame ground.
b.
The po
w
er cord shou
l
d be the appropriate t
y
pe as specified in the parts
l
istings.
c.
Insu
l
ation must not be fra
y
ed or
w
orn.
4.
Remo
v
e the co
v
er.
5.
Check for an
y
ob
v
ious non-IBM a
l
terations. Use good judgment as to the safet
y
of an
y
non-IBM
a
l
terations.
6
.
Check inside the unit for an
y
ob
v
ious unsafe conditions, such as meta
l
fi
l
ings, contamination,
w
ater or
other
l
iquids, or signs of fire or smoke damage.
7
.
Check for
w
orn, fra
y
ed, or pinched cab
l
es.