Tablet User Manual
Manuals
Brands
IBM Manuals
Tablet
X220
41
42
43
44
45
46
47
48
49
50
Wire
V
oltage
(V
dc)
Red
+2.5
to
+3.2
Black
Ground
Red(+)
Black(-)
•
If
the
voltage
is
corr
ect,
replace
the
syst
em
board.
•
If
the
voltage
is
not
correct,
r
eplace
the
backup
batt
ery
.
•
If
the
backup
battery
discharges
quickly
after
replacement,
r
eplace
the
system
boar
d.
Chapter
3
.
General
checkout
35
1
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40
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43
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