IBM 2388 Hardware Maintenance Manual - Page 44

Checking, backup, battery

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Checkout guide Terminal Voltage (V dc) 1 + 0 to + 12.6 (Li-ion) 5 Ground 3. If the voltage is less than +11.0 V dc, the battery pack has been discharged. Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +11.0 V dc after recharging, replace the battery. 4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 4 and 5. The resistance must be 4 to 30 K . If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board. Checking the backup battery The backup battery is rechargeable. To check 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 "1010 Battery pack" on page 66). 4. Remove the backup battery (see "Checking the battery pack" on page 39). 5. Measure the voltage of the backup battery. See the following figure. Terminal Voltage (V dc) + +2.5 to +3.2 - Ground v If the voltage is not correct, recharge the backup battery by connecting the ac adapter to the computer for one hour. v If the voltage is still not correct, replace the backup battery. 40 ThinkPad G40, G41

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Terminal
Voltage
(V
dc)
1
+
0
to
+
12.6
(Li-ion)
5
Ground
3.
If
the
voltage
is
less
than
+11.0
V
dc,
the
battery
pack
has
been
discharged.
Note:
Recharging
will
take
at
least
3
hours,
even
if
the
indicator
does
not
turn
on.
If
the
voltage
is
still
less
than
+11.0
V
dc
after
recharging,
replace
the
battery.
4.
If
the
voltage
is
more
than
+11.0
V
dc,
measure
the
resistance
between
battery
terminals
4
and
5.
The
resistance
must
be
4
to
30
K
±
.
If
the
resistance
is
not
correct,
replace
the
battery
pack.
If
the
resistance
is
correct,
replace
the
system
board.
Checking
the
backup
battery
The
backup
battery
is
rechargeable.
To
check
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
“1010
Battery
pack”
on
page
66).
4.
Remove
the
backup
battery
(see
“Checking
the
battery
pack”
on
page
39).
5.
Measure
the
voltage
of
the
backup
battery.
See
the
following
figure.
Terminal
Voltage
(V
dc)
+
+2.5
to
+3.2
-
Ground
v
If
the
voltage
is
not
correct,
recharge
the
backup
battery
by
connecting
the
ac
adapter
to
the
computer
for
one
hour.
v
If
the
voltage
is
still
not
correct,
replace
the
backup
battery.
Checkout
guide
40
ThinkPad
G40,
G41