Lenovo ThinkPad X40 User Manual - Page 53

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Checkout guide 1. Power off the computer, and unplug the ac adapter from it. 2. Turn the computer upside down. 3. Remove the battery pack (see "1010 Battery pack" on page 78). 4. Remove the backup battery (see "Checking the battery pack" on page 48). 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 descriptions 49

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1.
Power
off
the
computer,
and
unplug
the
ac
adapter
from
it.
2.
Turn
the
computer
upside
down.
3.
Remove
the
battery
pack
(see
“1010
Battery
pack”
on
page
78).
4.
Remove
the
backup
battery
(see
“Checking
the
battery
pack”
on
page
48).
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.
Checkout
guide
General
descriptions
49