IBM 2681 Hardware Maintenance Manual - Page 45

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Checkout guide 4 3 2 1(+) 5(-) Terminal Voltage (V dc) 1 + 0 to + 16.8 5 Ground (−) 3. If the voltage is less than +14.4 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 +14.4 V dc after recharging, replace the battery. 4. If the voltage is more than +14.4 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. For machine type 2684, 2685 To check the battery pack, do the following: 1. Power off the computer. 2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 5 (−). See the following figure: 4 3 2 1(+) 5(-) Terminal Voltage (V dc) 1 + 0 to + 12.6 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 . General descriptions 41

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2
3
4
5(-)
1(+)
Terminal
Voltage
(V
dc)
1
+
0
to
+
16.8
5
Ground
(
±
)
3.
If
the
voltage
is
less
than
+14.4
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
+14.4
V
dc
after
recharging,
replace
the
battery.
4.
If
the
voltage
is
more
than
+14.4
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.
For
machine
type
2684,
2685
To
check
the
battery
pack,
do
the
following:
1.
Power
off
the
computer.
2.
Remove
the
battery
pack
and
measure
the
voltage
between
battery
terminals
1
(+)
and
5
(
±
).
See
the
following
figure:
2
3
4
5(-)
1(+)
Terminal
Voltage
(V
dc)
1
+
0
to
+
12.6
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
±
.
Checkout
guide
General
descriptions
41