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IBM 22428QU ユーザーズマニュアル

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Checking
 
the
 
backup
 
battery
 
Do
 
the
 
following:
 
1.
   
Power
 
off
 
the
 
computer,
 
and
 
unplug
 
the
 
ac
 
adapter
 
from
 
it.
 
2.
   
Turn
 
the
 
computer
 
upside
 
down.
 
3.
   
Remove
 
the
 
battery
 
pack
 
(see
 
 
4.
   
Remove
 
the
 
backup
 
battery
 
(see
 
 
5.
   
Measure
 
the
 
voltage
 
of
 
the
 
backup
 
battery.
 
See
 
the
 
following
 
figure.
 
Red (+)
Black (-)
 
Wire
 
Voltage
 
(V
 
dc)
 
Red
 
+2.5
 
to
 
+3.2
 
Black
 
Ground
 
  
v
   
If
 
the
 
voltage
 
is
 
correct,
 
replace
 
the
 
system
 
board.
 
v
   
If
 
the
 
voltage
 
is
 
not
 
correct,
 
replace
 
the
 
backup
 
battery.
 
v
   
If
 
the
 
backup
 
battery
 
discharges
 
quickly
 
after
 
replacement,
 
replace
 
the
 
system
 
board.
 
General
 
checkout
 
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